Bài 9: Mảng trong Java!

[lehiep108]

[color=#000000]
 [/color][color=#007700]if([/color][color=#0000bb]ten[/color][color=#007700].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#0000bb]arrstring[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]));                  [/color][color=#0000bb]x[/color][color=#007700]=[/color][color=#0000bb]x[/color][color=#007700]+[/color][color=#0000bb]1[/color][color=#007700];            }        if([/color][color=#0000bb]x[/color][color=#007700]>[/color][color=#0000bb]0[/color][color=#007700])          [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ten "[/color][color=#007700]+[/color][color=#0000bb]ten[/color][color=#007700]+[/color][color=#dd0000]"  co trong danh sach"[/color][color=#007700]);        else          [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ten "[/color][color=#007700]+[/color][color=#0000bb]ten[/color][color=#007700]+[/color][color=#dd0000]" khong co trong danh sach"[/color][color=#007700]);        }        else{            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap so sinh vien lon hon 0"[/color][color=#007700]);[/color] 

cho mình hỏi if(ten.quals(arrstring)); này nghĩa là gì mình mới học mong các bạn chỉ bảo.

[xuyenhaviet]

bác nào dảnh xem giúp e nhé!!!
bài 1<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package arrdemo[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];[/color][color=#ff8000]//số sinh viên nhập từ bàn phím. khai báo 1 mảng gồm danh sách họ tên sinh viên.//tên từng sinh viên nhập từ bàn phím. //sau khi nhập xong, chương trình hỏi nhập tên sinh viên muốn tìm kiếm.//tìm và in ra kết quả là có trong danh sách hay không.[/color][color=#007700]public class [/color][color=#0000bb]bai1 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {            [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);            [/color][color=#0000bb]int i[/color][color=#007700];            [/color][color=#0000bb]boolean kq[/color][color=#007700]=[/color][color=#0000bb]false[/color][color=#007700];          [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhâp số sinh viên : "[/color][color=#007700]);             [/color][color=#0000bb]int n [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();            [/color][color=#0000bb]string  a [/color][color=#007700][] = new [/color][color=#0000bb]string [/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];          for( [/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập sinh viên thứ  : "[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);            [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập tên sinh viên muốn tìm : "[/color][color=#007700]);            [/color][color=#0000bb]string b [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();      for( [/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++) {          if([/color][color=#0000bb]b[/color][color=#007700].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]])){              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"có trong danh sách"[/color][color=#007700]);              [/color][color=#0000bb]kq[/color][color=#007700]=[/color][color=#0000bb]false[/color][color=#007700];          }        }if([/color][color=#0000bb]kq[/color][color=#007700]==[/color][color=#0000bb]false[/color][color=#007700])[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"khong có trong danh sách"[/color][color=#007700]);         }    } [/color] 

</blockquote></div>
</div>
</div>
bài 2<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package arrdemo[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]//sắp xếp 1 dãy n số nguyên nhập vào từ bàn phím theo thứ tự tăng dần![/color][color=#007700]public class [/color][color=#0000bb]bai2 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]int tmp[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"số phần tử của dãy : "[/color][color=#007700]);        [/color][color=#0000bb]int n[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]int [/color][color=#007700][][/color][color=#0000bb]a [/color][color=#007700]= new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập phần từ thứ "[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);            [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();      }        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<=[/color][color=#0000bb]i[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){              if([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]<[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]){                [/color][color=#0000bb]tmp [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];                [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];                [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]tmp[/color][color=#007700];              }            }              } for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" " [/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);        }              }}[/color] 

</blockquote></div>
</div>
</div>
bài 3 <div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/  [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]/**** @author mrkhoai*/[/color][color=#007700]public class [/color][color=#0000bb]bai3 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" nhập số hàng : "[/color][color=#007700]);        [/color][color=#0000bb]int h[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập số cột : "[/color][color=#007700]);        [/color][color=#0000bb]int c[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]int a1[/color][color=#007700][][]= new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]int a2[/color][color=#007700][][]= new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]int a3[/color][color=#007700][][]=new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập ma trận a1"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập a1["[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]+[/color][color=#dd0000]"["[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]);              [/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập ma trận a2"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập a1["[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]+[/color][color=#dd0000]"["[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]);              [/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận a1 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"  "[/color][color=#007700]+[/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận a2 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"tổng 2 ma trận là :"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]a3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]+[/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]];                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]a3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }      }    }  [/color] 

</blockquote></div>
</div>
</div>

bài 1 bạn nên sửa
for( i=0;i< n;i++) {
if(b.equals(a)){
kq=false;
system.out.println("có trong danh sách");
}else {
system.out.println("khong có trong danh sách");
break;
}
nó sẽ hiển thị đúng đó.
và bạn tạo
scanner in1=new scanner(system.in); cho a
scanner in=new scanner(system.in); cho b
riêng biệt thì nó sẽ không tự nhảy xuống hàng nữa.

[tienhm39]

bác nào dảnh xem giúp e nhé!!!
bài 1<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package arrdemo[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];[/color][color=#ff8000]//số sinh viên nhập từ bàn phím. khai báo 1 mảng gồm danh sách họ tên sinh viên.//tên từng sinh viên nhập từ bàn phím. //sau khi nhập xong, chương trình hỏi nhập tên sinh viên muốn tìm kiếm.//tìm và in ra kết quả là có trong danh sách hay không.[/color][color=#007700]public class [/color][color=#0000bb]bai1 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {            [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);            [/color][color=#0000bb]int i[/color][color=#007700];            [/color][color=#0000bb]boolean kq[/color][color=#007700]=[/color][color=#0000bb]false[/color][color=#007700];          [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhâp số sinh viên : "[/color][color=#007700]);              [/color][color=#0000bb]int n [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();            [/color][color=#0000bb]string  a [/color][color=#007700][] = new [/color][color=#0000bb]string [/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];            for( [/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập sinh viên thứ  : "[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);            [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập tên sinh viên muốn tìm : "[/color][color=#007700]);            [/color][color=#0000bb]string b [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();      for( [/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++) {          if([/color][color=#0000bb]b[/color][color=#007700].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]])){              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"có trong danh sách"[/color][color=#007700]);              [/color][color=#0000bb]kq[/color][color=#007700]=[/color][color=#0000bb]false[/color][color=#007700];          }        }if([/color][color=#0000bb]kq[/color][color=#007700]==[/color][color=#0000bb]false[/color][color=#007700])[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"khong có trong danh sách"[/color][color=#007700]);          }    } [/color] 

</blockquote></div>
</div>
</div>
bài 2<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package arrdemo[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]//sắp xếp 1 dãy n số nguyên nhập vào từ bàn phím theo thứ tự tăng dần![/color][color=#007700]public class [/color][color=#0000bb]bai2 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]int tmp[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"số phần tử của dãy : "[/color][color=#007700]);        [/color][color=#0000bb]int n[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]int [/color][color=#007700][][/color][color=#0000bb]a [/color][color=#007700]= new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập phần từ thứ "[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);            [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();      }        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<=[/color][color=#0000bb]i[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){              if([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]<[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]){                [/color][color=#0000bb]tmp [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];                [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];                [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]tmp[/color][color=#007700];              }            }                } for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" " [/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);        }                    }}[/color] 

</blockquote></div>
</div>
</div>
bài 3 <div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/  [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]/**** @author mrkhoai*/[/color][color=#007700]public class [/color][color=#0000bb]bai3 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" nhập số hàng : "[/color][color=#007700]);        [/color][color=#0000bb]int h[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập số cột : "[/color][color=#007700]);        [/color][color=#0000bb]int c[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]int a1[/color][color=#007700][][]= new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]int a2[/color][color=#007700][][]= new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]int a3[/color][color=#007700][][]=new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập ma trận a1"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập a1["[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]+[/color][color=#dd0000]"["[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]);              [/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập ma trận a2"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập a1["[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]+[/color][color=#dd0000]"["[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]);              [/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận a1 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"  "[/color][color=#007700]+[/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận a2 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"tổng 2 ma trận là :"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]a3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]+[/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]];                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]a3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }      }    }     [/color] 

</blockquote></div>
</div>
</div>

bài này dùng được cho các loại ma trận a[][] , ko riêng gì ma trận vuông theo đề bài ^^

[theheweb]

từ bài này code khá dài và chấm mất công vị vậy ở mỗi bài bạn có thể cho đáp án ở dưới luôn. để khi mình làm xong tiện so sánh và đối chiếu. mình là người mới bắt đầu tìm hiểu vào lập trình java nên ở nhiều bài thấy các bạn làm có các kiến thức mà ở các bài trước chưa có vì vậy xem đáp án của họ cũng ko hiểu hết dk

[Bietthu102]

m.n xem dùm bài này nếu mình muốn tách chổ xuất mảng ra 1 phương thức mới thì làm sao vậy.....
<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>bai2 (move your mouse to reveal the content)</noscript>

bai2 (open)
bai2 (close)

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote></blockquote></div>
</div>
</div>

[color=#000000]
package bai2[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];public class [/color][color=#0000bb]bai2 [/color][color=#007700]{[/color][color=#0000bb]int n[/color][color=#007700];[/color][color=#0000bb]scanner s [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);public [/color][color=#0000bb]void nhapn[/color][color=#007700]() {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap so phan tu so nguyen n:"[/color][color=#007700]);[/color][color=#0000bb]n [/color][color=#007700]= [/color][color=#0000bb]s[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();}public [/color][color=#0000bb]void nhappt[/color][color=#007700]() {[/color][color=#0000bb]int arrayint[/color][color=#007700][] = new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];[/color][color=#0000bb]int tam[/color][color=#007700];for([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap phan tu thu:"[/color][color=#007700]+([/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#0000bb]1[/color][color=#007700]));[/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]s[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();}for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++) {for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<=[/color][color=#0000bb]j[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++) {if([/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]>[/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]) {[/color][color=#0000bb]tam[/color][color=#007700]=[/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];[/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];[/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]tam[/color][color=#007700];}}}[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ds sau khi sap xep:"[/color][color=#007700]);for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" " [/color][color=#007700]+ [/color][color=#0000bb]arrayint[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);} }}[/color] 

[color=#000000]
package bai2[/color][color=#007700];public class [/color][color=#0000bb]main [/color][color=#007700]{public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {[/color][color=#0000bb]bai2 bai2 [/color][color=#007700]= new [/color][color=#0000bb]bai2[/color][color=#007700]();[/color][color=#0000bb]bai2[/color][color=#007700].[/color][color=#0000bb]nhapn[/color][color=#007700]();[/color][color=#0000bb]bai2[/color][color=#007700].[/color][color=#0000bb]nhappt[/color][color=#007700]();}}[/color] 

[vunguyencen]

<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];public class [/color][color=#0000bb]arrdemo [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {         [/color][color=#0000bb]string stu[/color][color=#007700], [/color][color=#0000bb]findstu[/color][color=#007700];        [/color][color=#0000bb]string [/color][color=#007700][] [/color][color=#0000bb]arrstu [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700][[/color][color=#0000bb]3[/color][color=#007700]];        [/color][color=#0000bb]scanner nhap [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]3[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)        {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập tên sinh viên thứ: "[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);            [/color][color=#0000bb]stu [/color][color=#007700]= [/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();            [/color][color=#0000bb]arrstu[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]stu[/color][color=#007700];                    }                        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập sv muôn tìm: "[/color][color=#007700]);        [/color][color=#0000bb]findstu [/color][color=#007700]= [/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"sv :"[/color][color=#007700]+[/color][color=#0000bb]findstu[/color][color=#007700]);        for([/color][color=#0000bb]int i [/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]< [/color][color=#0000bb]3[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)        {                        if([/color][color=#0000bb]findstu[/color][color=#007700].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#0000bb]arrstu[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]) )            {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"sv có trong ds!"[/color][color=#007700]);                           }            else             {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"khong có sv trong ds!"[/color][color=#007700]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"
"[/color][color=#007700]);                    }        [/color][color=#ff8000]//bài 2            [/color][color=#0000bb]int [/color][color=#007700][] [/color][color=#0000bb]arrn [/color][color=#007700]= {[/color][color=#0000bb]2[/color][color=#007700],[/color][color=#0000bb]8[/color][color=#007700],[/color][color=#0000bb]6[/color][color=#007700],[/color][color=#0000bb]1[/color][color=#007700],[/color][color=#0000bb]0[/color][color=#007700],[/color][color=#0000bb]9[/color][color=#007700],[/color][color=#0000bb]4[/color][color=#007700],[/color][color=#0000bb]7[/color][color=#007700]};            for([/color][color=#0000bb]int i [/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]arrn[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)            {                for([/color][color=#0000bb]int j [/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]<=[/color][color=#0000bb]i[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++)                {                                        if ([/color][color=#0000bb]arrn[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]<[/color][color=#0000bb]arrn[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]])                    {                        [/color][color=#0000bb]int tmp [/color][color=#007700]=[/color][color=#0000bb]arrn[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];                        [/color][color=#0000bb]arrn[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]arrn[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];                        [/color][color=#0000bb]arrn[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]tmp[/color][color=#007700];                                            }                }                }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"mang sau khi sap xep: "[/color][color=#007700]);            for ([/color][color=#0000bb]int i [/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]<[/color][color=#0000bb]arrn[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)            {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print( +[/color][color=#0000bb]arrn[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]+[/color][color=#dd0000]" "[/color][color=#007700]);            }                        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"
"[/color][color=#007700]);        [/color][color=#0000bb]scanner sl [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap so hang:"[/color][color=#007700]);        [/color][color=#0000bb]int m [/color][color=#007700]= [/color][color=#0000bb]sl[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap so cot:"[/color][color=#007700]);        [/color][color=#0000bb]int n [/color][color=#007700]= [/color][color=#0000bb]sl[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]int [/color][color=#007700][][] [/color][color=#0000bb]arrma [/color][color=#007700]= new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]m[/color][color=#007700]][[/color][color=#0000bb]n[/color][color=#007700]];        [/color][color=#0000bb]int [/color][color=#007700][][] [/color][color=#0000bb]arrmb [/color][color=#007700]= new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]m[/color][color=#007700]][[/color][color=#0000bb]n[/color][color=#007700]];        [/color][color=#0000bb]int [/color][color=#007700][][] [/color][color=#0000bb]arrmc [/color][color=#007700]= new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]m[/color][color=#007700]][[/color][color=#0000bb]n[/color][color=#007700]];                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap hang 1"[/color][color=#007700]);        for([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]m[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)        {            for([/color][color=#0000bb]int j [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++)            {                [/color][color=#0000bb]arrma[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]sl[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap hang 2"[/color][color=#007700]);                {                    for([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]m[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)        {            for([/color][color=#0000bb]int j [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++)            {                [/color][color=#0000bb]arrmb[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]sl[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận 1 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]m[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++)        {            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"  "[/color][color=#007700]+[/color][color=#0000bb]arrma[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận 2 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]m[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++)        {            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]arrmb[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]m[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++)        {            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++)            {                [/color][color=#0000bb]arrmc[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]= [/color][color=#0000bb]arrma[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]+[/color][color=#0000bb]arrmb[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]];                            }                    }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"tổng 2 ma trận: "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]m[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++)        {            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]arrmc[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }                                }    }    }[/color] 

</blockquote></div>
</div>
</div>

[annguyen.ev12]

admin oi em nghi la anh nen them nhieu vi du minh hoa hon.....nhieu luc doc cha hieu cai j

[vinaseo]

<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>bai01 (move your mouse to reveal the content)</noscript>

bai01 (open)
bai01 (close)

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
package edu[/color][color=#007700].[/color][color=#0000bb]ducky[/color][color=#007700].[/color][color=#0000bb]basic[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; public class [/color][color=#0000bb]arraydemo [/color][color=#007700]{public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {[/color][color=#0000bb]scanner nhapdulieu [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);[/color][color=#0000bb]int numberstudents[/color][color=#007700];[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap so luong sinh vien:"[/color][color=#007700]);[/color][color=#0000bb]numberstudents [/color][color=#007700]= [/color][color=#0000bb]integer[/color][color=#007700].[/color][color=#0000bb]parseint[/color][color=#007700]([/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]());[/color][color=#0000bb]string liststudents[/color][color=#007700][] = new [/color][color=#0000bb]string[/color][color=#007700][[/color][color=#0000bb]numberstudents[/color][color=#007700]];    for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]liststudents[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"ten cua sinh vien thu " [/color][color=#007700]+ [/color][color=#0000bb]i [/color][color=#007700]+ [/color][color=#dd0000]":"[/color][color=#007700]);[/color][color=#0000bb]liststudents[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();}[/color][color=#0000bb]string find[/color][color=#007700];[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap ten sinh vien can tim:"[/color][color=#007700]);[/color][color=#0000bb]find [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();[/color][color=#0000bb]boolean result [/color][color=#007700]= [/color][color=#0000bb]false[/color][color=#007700];for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]liststudents[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) {if ([/color][color=#0000bb]find[/color][color=#007700].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]liststudents[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]) == [/color][color=#0000bb]0[/color][color=#007700]) {[/color][color=#0000bb]result [/color][color=#007700]= [/color][color=#0000bb]true[/color][color=#007700];}}if ([/color][color=#0000bb]result [/color][color=#007700]== [/color][color=#0000bb]true[/color][color=#007700])[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"sinh vien co ten " [/color][color=#007700]+ [/color][color=#0000bb]find [/color][color=#007700]+ [/color][color=#dd0000]" da duoc tim thay"[/color][color=#007700]);else[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"khong tim thay sinh vien ten " [/color][color=#007700]+ [/color][color=#0000bb]find[/color][color=#007700]);[/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();}}[/color] 

</blockquote></div>
</div>
</div>

<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>bai02 (move your mouse to reveal the content)</noscript>

bai02 (open)
bai02 (close)

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
package edu[/color][color=#007700].[/color][color=#0000bb]ducky[/color][color=#007700].[/color][color=#0000bb]basic[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];public class [/color][color=#0000bb]arrayarrangement [/color][color=#007700]{public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]){[/color][color=#0000bb]scanner in [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);[/color][color=#0000bb]int n[/color][color=#007700];[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap n:"[/color][color=#007700]);[/color][color=#0000bb]n [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();[/color][color=#0000bb]int a[/color][color=#007700][] = new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];for([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++){[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap so nguyen thu "[/color][color=#007700]+([/color][color=#0000bb]i [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700])+[/color][color=#dd0000]" :"[/color][color=#007700]);[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();} [/color][color=#ff8000]//sap xep[/color][color=#007700]for([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n [/color][color=#007700]- [/color][color=#0000bb]1[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++){for([/color][color=#0000bb]int j [/color][color=#007700]= [/color][color=#0000bb]i [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700]; [/color][color=#0000bb]j [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++){if([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] > [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]){[/color][color=#0000bb]int temp [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]temp[/color][color=#007700];}}}[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"day so nguyen sau khi duoc sap xep"[/color][color=#007700]);for([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]+[/color][color=#dd0000]" "[/color][color=#007700]);[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();}}[/color] 

</blockquote></div>
</div>
</div>

<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>bai03 (move your mouse to reveal the content)</noscript>

bai03 (open)
bai03 (close)

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
package edu[/color][color=#007700].[/color][color=#0000bb]ducky[/color][color=#007700].[/color][color=#0000bb]basic[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; public class [/color][color=#0000bb]matriz [/color][color=#007700]{public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {[/color][color=#0000bb]scanner in [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);[/color][color=#0000bb]int n[/color][color=#007700];[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"input number line and column:"[/color][color=#007700]);[/color][color=#0000bb]n [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();[/color][color=#0000bb]int array1[/color][color=#007700][][] = new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]][[/color][color=#0000bb]n[/color][color=#007700]];[/color][color=#0000bb]int array2[/color][color=#007700][][] = new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]][[/color][color=#0000bb]n[/color][color=#007700]];    [/color][color=#0000bb]int i[/color][color=#007700], [/color][color=#0000bb]j[/color][color=#007700];for ([/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++)for ([/color][color=#0000bb]j [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]j [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++){[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"input array1[" [/color][color=#007700]+ [/color][color=#0000bb]i [/color][color=#007700]+ [/color][color=#dd0000]"][" [/color][color=#007700]+ [/color][color=#0000bb]j [/color][color=#007700]+ [/color][color=#dd0000]"]:"[/color][color=#007700]);[/color][color=#0000bb]array1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();}for ([/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) for ([/color][color=#0000bb]j [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]j [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"input array2[" [/color][color=#007700]+ [/color][color=#0000bb]i [/color][color=#007700]+ [/color][color=#dd0000]"][" [/color][color=#007700]+ [/color][color=#0000bb]j [/color][color=#007700]+ [/color][color=#dd0000]"]:"[/color][color=#007700]);[/color][color=#0000bb]array2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();}[/color][color=#ff8000]//addition array1 and array2[/color][color=#0000bb]int array3[/color][color=#007700][][] = new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]][[/color][color=#0000bb]n[/color][color=#007700]];for ([/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++){for ([/color][color=#0000bb]j [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]j [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++){[/color][color=#0000bb]array3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]array1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]] + [/color][color=#0000bb]array2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]];[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#0000bb]array3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]+[/color][color=#dd0000]"  "[/color][color=#007700]);}[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]();}[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();}}[/color] 

</blockquote></div>
</div>
</div>

[thienanan94]

bác nào dảnh xem giúp e nhé!!!
bài 1<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package arrdemo[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];[/color][color=#ff8000]//số sinh viên nhập từ bàn phím. khai báo 1 mảng gồm danh sách họ tên sinh viên.//tên từng sinh viên nhập từ bàn phím. //sau khi nhập xong, chương trình hỏi nhập tên sinh viên muốn tìm kiếm.//tìm và in ra kết quả là có trong danh sách hay không.[/color][color=#007700]public class [/color][color=#0000bb]bai1 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {            [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);            [/color][color=#0000bb]int i[/color][color=#007700];            [/color][color=#0000bb]boolean kq[/color][color=#007700]=[/color][color=#0000bb]false[/color][color=#007700];          [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhâp số sinh viên : "[/color][color=#007700]);             [/color][color=#0000bb]int n [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();            [/color][color=#0000bb]string  a [/color][color=#007700][] = new [/color][color=#0000bb]string [/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];           for( [/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập sinh viên thứ  : "[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);            [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập tên sinh viên muốn tìm : "[/color][color=#007700]);            [/color][color=#0000bb]string b [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();      for( [/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++) {          if([/color][color=#0000bb]b[/color][color=#007700].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]])){              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"có trong danh sách"[/color][color=#007700]);              [/color][color=#0000bb]kq[/color][color=#007700]=[/color][color=#0000bb]false[/color][color=#007700];          }        }if([/color][color=#0000bb]kq[/color][color=#007700]==[/color][color=#0000bb]false[/color][color=#007700])[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"khong có trong danh sách"[/color][color=#007700]);         }    } [/color] 

</blockquote></div>
</div>
</div>
bài 2<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package arrdemo[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]//sắp xếp 1 dãy n số nguyên nhập vào từ bàn phím theo thứ tự tăng dần![/color][color=#007700]public class [/color][color=#0000bb]bai2 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]int tmp[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"số phần tử của dãy : "[/color][color=#007700]);        [/color][color=#0000bb]int n[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]int [/color][color=#007700][][/color][color=#0000bb]a [/color][color=#007700]= new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]n[/color][color=#007700]];        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập phần từ thứ "[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]);            [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();      }        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]n[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<=[/color][color=#0000bb]i[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){              if([/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]<[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]){                [/color][color=#0000bb]tmp [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];                [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]=[/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];                [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]tmp[/color][color=#007700];              }            }               } for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]n[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" " [/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);        }                 }}[/color] 

</blockquote></div>
</div>
</div>
bài 3 <div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>spoiler (move your mouse to the spoiler area to reveal the content)</noscript>

show spoiler
hide spoiler

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
[/color][color=#ff8000]/** to change this template, choose tools | templates* and open the template in the editor.*/  [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]/**** @author mrkhoai*/[/color][color=#007700]public class [/color][color=#0000bb]bai3 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]scanner in[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" nhập số hàng : "[/color][color=#007700]);        [/color][color=#0000bb]int h[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập số cột : "[/color][color=#007700]);        [/color][color=#0000bb]int c[/color][color=#007700]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]int a1[/color][color=#007700][][]= new [/color][color=#0000bb]int[/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]int a2[/color][color=#007700][][]= new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]int a3[/color][color=#007700][][]=new [/color][color=#0000bb]int [/color][color=#007700][[/color][color=#0000bb]h[/color][color=#007700]][[/color][color=#0000bb]c[/color][color=#007700]];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập ma trận a1"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập a1["[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]+[/color][color=#dd0000]"["[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]);              [/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập ma trận a2"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhập a1["[/color][color=#007700]+[/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]+[/color][color=#dd0000]"["[/color][color=#007700]+[/color][color=#0000bb]j[/color][color=#007700]+[/color][color=#dd0000]"]"[/color][color=#007700]);              [/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            }        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận a1 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"  "[/color][color=#007700]+[/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ma trận a2 là : "[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"tổng 2 ma trận là :"[/color][color=#007700]);        for([/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]h[/color][color=#007700];[/color][color=#0000bb]i[/color][color=#007700]++){            for([/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]<[/color][color=#0000bb]c[/color][color=#007700];[/color][color=#0000bb]j[/color][color=#007700]++){                [/color][color=#0000bb]a3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]=[/color][color=#0000bb]a1[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]+[/color][color=#0000bb]a2[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]];                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]" "[/color][color=#007700]+[/color][color=#0000bb]a3[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]][[/color][color=#0000bb]j[/color][color=#007700]]);            }[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        }      }    }   [/color] 

</blockquote></div>
</div>
</div>

bài 1 theo mình trong câu lệnh for( i=0;i<n;i++) bạn nên để i>0

[hoiquanbds0101]

<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>code bai 3 chuan nhat! (move your mouse to reveal the content)</noscript>

code bai 3 chuan nhat! (open)
code bai 3 chuan nhat! (close)

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote></blockquote></div>
</div>
</div>

[color=#000000]
[/color] 

package java;
import java.util.scanner;
public class matrix {
private int[][] matrix1, matrix2, summatrix; // summatrix de luu tong 2 ma
// tran
private int numberrow, numbercolumn;

public matrix() {
system.out.println("nhap so hang va so cot cua 2 ma tran : ");
scanner inp = new scanner(system.in);
numberrow = inp.nextint(); // nhap so hang
numbercolumn = inp.nextint(); // nhap so cot
matrix1 = new int[numberrow][numbercolumn];
matrix2 = new int[numberrow][numbercolumn];
}

public void input(int matrix[][]) {
scanner inp = new scanner(system.in);
for (int i = 0; i < numberrow; i++)
// nhap ma tran dau tien
for (int j = 0; j < numbercolumn; j++) {
system.out.print("a[" + i + "][" + j + "] = ");
matrix[j] = inp.nextint();
}

}

public void show(int matrix[][]) { // dua ma tran ra man hinh
system.out.println();
for (int i = 0; i < numberrow; i++) {
for (int j = 0; j < numbercolumn; j++)

system.out.print(matrix[j] + " ");
system.out.print("
");
}
}

public void sumoftowmatrix() { // tinh tong 2 ma tran
summatrix = new int[numberrow][numbercolumn];
int i = 0, j;
while(i<numberrow){
for (j = 0; j<numbercolumn; j++)
summatrix[j] = matrix1[j] + matrix2[j];
i++;
}

}

public static void main(string[] args) {
matrix mt = new matrix();
system.out.println("nhap cac phan tu cho ma tran thu nhat : ");
mt.input(mt.matrix1);
system.out.println("nhap cac phan tu cho ma tran thu hai : ");
mt.input(mt.matrix2);
system.out.println("ma tran thu nhat da nhap la : ");
mt.show(mt.matrix1);
system.out.println("
ma tran thu hai da nhap la : ");
mt.show(mt.matrix2);
mt.sumoftowmatrix();
system.out.println("
tong 2 ma tran la : ");
mt.show(mt.summatrix);
}
}