Bài 10: Break và Continue trong Java

**nguyenduchd89** · 09-08-2013, 07:00 AM

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Mã:

package javaapplication36;
 
/**
*
* @author haitran
*/
import java.util.scanner;
public class javaapplication36 {
    public static void main(string[] args) {
        scanner in = new scanner(system.in);
        int n,i,j;
        string sx,tsv;
        system.out.println("số sinh viên cần nhập: ");
        n = in.nextint();
        in.nextline();
        string [] tensv = new string[n];
        for (i = 0; i < tensv.length; i++){
            system.out.println("tên sinh viên thứ " + (i + 1) + " là: " );
            tensv[i]= in.nextline();
        }
        system.out.println("sắp xếp lại tên sinh viên: ");
        for (i =0; i< tensv.length; i++){
          for (j= i+1; j <tensv.length; j++){
              if (tensv[i].compareto(tensv[j])>0){
                  sx = tensv[i];
                  tensv[i] = tensv[j];
                  tensv[j] = sx;
              }
          }
            system.out.println("tên sinh viên thứ " + (i + 1) + " là: ");
            system.out.println(tensv[i]);
        }
        system.out.println(" tên sinh viên cần tìm là: ");
        tsv = in.nextline();
        system.out.println("tên sinh viên vừa nhập là: " + tsv);
        int left = 0, right = n -1, mid, vt = -1;
        while (left < right){
            mid = (left + right)/2;
            if (tsv.equals(tensv[mid])){
              vt = mid +1;
            }
            else if (tsv.compareto(tensv[mid]) > 0) {
                left = mid +1;
            }
            else {
                right =mid -1;
                break;
            }
            if (mid > -1){
                system.out.println("ten sv " + tsv + " o vi tri " + (mid +1) );
                break;
            }
            else {
                system.out.println("khong co sv can tim");
                break;
            }
        }
        return ;
        }
    }

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không biết đúng hay sai, ai sửa giúp mình với

**hoangnhuai** · 09-08-2013, 07:00 AM

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Mã:

package javaapplication36;
 
/**
*
* @author haitran
*/
import java.util.scanner;
public class javaapplication36 {
    public static void main(string[] args) {
        scanner in = new scanner(system.in);
        int n,i,j;
        string sx,tsv;
        system.out.println("số sinh viên cần nhập: ");
        n = in.nextint();
        in.nextline();
        string [] tensv = new string[n];
        for (i = 0; i < tensv.length; i++){
            system.out.println("tên sinh viên thứ " + (i + 1) + " là: " );
            tensv[i]= in.nextline();
        }
        system.out.println("sắp xếp lại tên sinh viên: ");
        for (i =0; i< tensv.length; i++){
          for (j= i+1; j <tensv.length; j++){
              if (tensv[i].compareto(tensv[j])>0){
                  sx = tensv[i];
                  tensv[i] = tensv[j];
                  tensv[j] = sx;
              }
          }
            system.out.println("tên sinh viên thứ " + (i + 1) + " là: ");
            system.out.println(tensv[i]);
        }
        system.out.println(" tên sinh viên cần tìm là: ");
        tsv = in.nextline();
        system.out.println("tên sinh viên vừa nhập là: " + tsv);
        int left = 0, right = n -1, mid, vt = -1;
        while (left < right){
            mid = (left + right)/2;
            if (tsv.equals(tensv[mid])){
              vt = mid +1;
            }
            else if (tsv.compareto(tensv[mid]) > 0) {
                left = mid +1;
            }
            else {
                right =mid -1;
                break;
            }
            if (mid > -1){
                system.out.println("ten sv " + tsv + " o vi tri " + (mid +1) );
                break;
            }
            else {
                system.out.println("khong co sv can tim");
                break;
            }
        }
        return ;
        }
    }

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không biết đúng hay sai, ai sửa giúp mình với

**quan jean gia si** · 09-08-2013, 07:00 AM

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Mã:

import java.util.scanner;
 
public class bai02 {
    public static void main(string[]args){
        scanner in=new scanner(system.in);
        int n;
        system.out.println("so hoc sinh can nhap : ");
        n=in.nextint();
        in.nextline();
        system.out.println("nhap ds ho ten sv:");
        string []a=new string[n];
        int i;
        for(i=0;i<n;i++)
        {
            system.out.print("htsv thu "+i);
            a[i]=in.nextline();
        }
        // in ds
        system.out.println("danh sach htsv vua nhap:");
        for(i=0;i<n;i++)
        {
            system.out.println("htsv thu "+i+": "+a[i]);
        }
        //sap xep ds
        system.out.println("danh sach htsv sau khi sap xep:");
        string tmp;
        for(i=0;i<n-1;i++)
        {
            for(int j=i+1;j<n;j++)
            {
                if(a[i].compareto(a[j])>0)
                {
                    tmp=a[i];
                    a[i]=a[j];
                    a[j]=tmp;
                }
            }
        }
        //in ra sau sap xep
        for(i=0;i<n;i++)
        {
            system.out.println(a[i]);
        }
        //nhap ten sv can tim
        string tsv;
        system.out.println("ten sv can tim:");
        tsv=in.nextline();
       
        //tim nhi phan
        int c=tim_nhi_phan(a,n,tsv);
        if(c==1){
            system.out.println(" tim thay hs nay");
        }
        else{
            system.out.println("khong thay hs nay trong ds");
        }
    }
    public static int tim_nhi_phan (string a[] , int n , string tsv)
    {
        int left = 0, right = n -1,mid;
        do
        {
            mid=(left+right)/2;
            if(tsv.compareto(a[mid])==0)
            {
                system.out.print(" tai vi tri "+mid);
                return 1;
            }
            else if(tsv.compareto(a[mid])<0)
            {
                right=mid-1;   
            }
            else
            {
                left=mid+1;
            }   
        }while(left<=right);
        return 0;
    }   
}

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**ADVWADMQ7492** · 09-13-2013, 07:00 AM

Mã nguồn PHP:


[color=#000000]
 sau gần 2 tuần vật vã với thời khóa biểu mới[/color][color=#007700]. [/color][color=#0000bb]cuối cùng cũng lập được một nhóm học java[/color][color=#007700]+[/color][color=#0000bb]android trong trường[/color][color=#007700]. [/color][color=#0000bb]phù[/color][color=#007700], [/color][color=#0000bb]chiến tiếp[/color][color=#007700]. [/color][color=#0000bb]hì[/color][color=#007700]...[/color]

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Mã nguồn PHP:


[color=#000000]
package structure[/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]student1 [/color][color=#007700]{    private [/color][color=#0000bb]string name[/color][color=#007700][];    private [/color][color=#0000bb]int number[/color][color=#007700];       public [/color][color=#0000bb]void input[/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]"entry the value of variable number"[/color][color=#007700]);        [/color][color=#0000bb]number [/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]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap danh sach sinh vien"[/color][color=#007700]);        [/color][color=#0000bb]name [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700][[/color][color=#0000bb]number[/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]number[/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]"student: "[/color][color=#007700]+([/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#0000bb]1[/color][color=#007700]));            [/color][color=#0000bb]name[/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=#ff8000]//end the method input.       [/color][color=#007700]public [/color][color=#0000bb]void output[/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]number[/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=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]+[/color][color=#dd0000]"\t"[/color][color=#007700]);        }    }[/color][color=#ff8000]//end the method output.       [/color][color=#007700]public [/color][color=#0000bb]void sort[/color][color=#007700](){        [/color][color=#0000bb]string temp[/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]number[/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]number[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++){                if( [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]])>[/color][color=#0000bb]0 [/color][color=#007700]){                    [/color][color=#0000bb]temp [/color][color=#007700]= [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];                    [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];                    [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]temp[/color][color=#007700];                }            }        }    }[/color][color=#ff8000]//end the method sort.       [/color][color=#007700]public [/color][color=#0000bb]void shownumber[/color][color=#007700]([/color][color=#0000bb]string student[/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]number[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++){            if( [/color][color=#0000bb]student[/color][color=#007700].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]i[/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]"vi tri trong danh sach"[/color][color=#007700]+([/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#0000bb]1[/color][color=#007700]));                break;            }            else if([/color][color=#0000bb]i[/color][color=#007700]==[/color][color=#0000bb]number[/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 tim thay"[/color][color=#007700]);            }        }    }[/color][color=#ff8000]//end the shownumber.       [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string args [/color][color=#007700][]){        [/color][color=#0000bb]student1 out [/color][color=#007700]= new [/color][color=#0000bb]student1[/color][color=#007700]();        [/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]input[/color][color=#007700]();        [/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]output[/color][color=#007700]();        [/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]sort[/color][color=#007700]();        [/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]output[/color][color=#007700]();        [/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]shownumber[/color][color=#007700]([/color][color=#dd0000]"ho hoai kiet"[/color][color=#007700]);    }[/color][color=#ff8000]//end the method main.   [/color][color=#007700]}[/color][color=#ff8000]//end the class student1.[/color]

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**namseotop** · 09-26-2013, 07:00 AM

ai giúp mình với sao ra được 189 vậy. chạy tay mãi mà không ra.
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Mã nguồn PHP:


[color=#000000]
int sum1[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];[/color][color=#0000bb]int number1[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];while([/color][color=#0000bb]number1[/color][color=#007700]<[/color][color=#0000bb]20[/color][color=#007700]){    [/color][color=#0000bb]number1[/color][color=#007700]++;    if([/color][color=#0000bb]number1[/color][color=#007700]==[/color][color=#0000bb]10 [/color][color=#007700]|| [/color][color=#0000bb]number1[/color][color=#007700]==[/color][color=#0000bb]11[/color][color=#007700])        continue;    [/color][color=#0000bb]sum1[/color][color=#007700]+=[/color][color=#0000bb]number1[/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]"the sum is: "[/color][color=#007700]+[/color][color=#0000bb]sum1[/color][color=#007700]); [/color][color=#ff8000]//189[/color]

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**ducgbp1** · 10-24-2013, 07:00 AM

Gửi bởi sky6596

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Mã nguồn PHP:


[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 sky*/[/color][color=#007700]public class [/color][color=#0000bb]student [/color][color=#007700]{     private [/color][color=#0000bb]string name[/color][color=#007700][];    private [/color][color=#0000bb]int numberstudent[/color][color=#007700];     public [/color][color=#0000bb]void input[/color][color=#007700]() {        [/color][color=#0000bb]scanner inp [/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 sinh vien : "[/color][color=#007700]);        [/color][color=#0000bb]numberstudent [/color][color=#007700]= [/color][color=#0000bb]inp[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]inp[/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]"nhap ten cac sinh vien : "[/color][color=#007700]);        [/color][color=#0000bb]name [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700][[/color][color=#0000bb]numberstudent[/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]numberstudent[/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]"sinh vien thu : " [/color][color=#007700]+ ([/color][color=#0000bb]i [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700]));            [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]inp[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        }    }     public [/color][color=#0000bb]void showlist[/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]numberstudent[/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=#0000bb]i [/color][color=#007700]+ [/color][color=#0000bb]1 [/color][color=#007700]+ [/color][color=#dd0000]"." [/color][color=#007700]+ [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);        }    }     public [/color][color=#0000bb]void sapxep[/color][color=#007700]() {        for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]numberstudent[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]> [/color][color=#0000bb]0[/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]1[/color][color=#007700]; [/color][color=#0000bb]j[/color][color=#007700]++) {                if ([/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700]]) > [/color][color=#0000bb]0[/color][color=#007700]) {                    [/color][color=#0000bb]string temp [/color][color=#007700]= [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];                    [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700]];                    [/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]j [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700]] = [/color][color=#0000bb]temp[/color][color=#007700];                }            }        }    }     public [/color][color=#0000bb]int search[/color][color=#007700]([/color][color=#0000bb]string hoten[/color][color=#007700]) {         [/color][color=#0000bb]int d [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700], [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]numberstudent [/color][color=#007700]- [/color][color=#0000bb]1[/color][color=#007700], [/color][color=#0000bb]g [/color][color=#007700]= -[/color][color=#0000bb]1[/color][color=#007700];        while ([/color][color=#0000bb]d [/color][color=#007700]<= [/color][color=#0000bb]c[/color][color=#007700]) {            [/color][color=#0000bb]g [/color][color=#007700]= ([/color][color=#0000bb]d [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]) / [/color][color=#0000bb]2[/color][color=#007700];            if ([/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]g[/color][color=#007700]].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#0000bb]hoten[/color][color=#007700])) {                return [/color][color=#0000bb]g [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700];            }            if ([/color][color=#0000bb]hoten[/color][color=#007700].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]name[/color][color=#007700][[/color][color=#0000bb]g[/color][color=#007700]]) > [/color][color=#0000bb]0[/color][color=#007700]) {                [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]g [/color][color=#007700]- [/color][color=#0000bb]1[/color][color=#007700];            } else {                [/color][color=#0000bb]d [/color][color=#007700]= [/color][color=#0000bb]g [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700];            }        }        return -[/color][color=#0000bb]1[/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]student st1 [/color][color=#007700]= new [/color][color=#0000bb]student[/color][color=#007700]();        [/color][color=#0000bb]st1[/color][color=#007700].[/color][color=#0000bb]input[/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]"danh sach sinh vien da nhap : "[/color][color=#007700]);        [/color][color=#0000bb]st1[/color][color=#007700].[/color][color=#0000bb]showlist[/color][color=#007700]();        [/color][color=#0000bb]st1[/color][color=#007700].[/color][color=#0000bb]sapxep[/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]"danh sach sau khi sap xep lai la : "[/color][color=#007700]);        [/color][color=#0000bb]st1[/color][color=#007700].[/color][color=#0000bb]showlist[/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 ten sinh vien can tim : "[/color][color=#007700]);        [/color][color=#0000bb]scanner inp [/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]string hoten [/color][color=#007700]= [/color][color=#0000bb]inp[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]int k [/color][color=#007700]= [/color][color=#0000bb]st1[/color][color=#007700].[/color][color=#0000bb]search[/color][color=#007700]([/color][color=#0000bb]hoten[/color][color=#007700]);        if ([/color][color=#0000bb]k [/color][color=#007700]!= -[/color][color=#0000bb]1[/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]"so thu tu cua sinh vien do trong danh sach la : "[/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]k[/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 sinh vien vua nhap khong co trong danh sach"[/color][color=#007700]);        }    }}[/color]

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

bạn nói rõ về phương thức dưới được hk?
public int search(string hoten) {

int d = 0, c = numberstudent - 1, g = -1;
while (d <= c) {
g = (d + c) / 2;
if (name[g].equals(hoten)) {
return g + 1;
}
if (hoten.compareto(name[g]) > 0) {
c = g - 1;
} else {
d = g + 1;
}
}
return -1;
}

**sangdv** · 10-31-2013, 07:00 AM

em xin nộp bài :d
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Mã:

import java.util.scanner;
public class bt1 {
    public static void main(string[] args)  {
        scanner input = new scanner(system.in);
        system.out.print("nhap so sinh vien: ");
        int n = input.nextint();
        input.nextline();
        string[] danhsachsv = new string[n];
        system.out.println("**nhap ten cac sinh vien**");
        for (int i=0; i<n; i++) {
            system.out.print("sinh vien " + (i+1) + ": ");
            danhsachsv[i] = input.nextline();
        }
        for (int i=0; i<n; i++) {
            for (int j=(i+1); j<n; j++) {
                if (danhsachsv[i].compareto(danhsachsv[j]) > 0) {
                    string phu = danhsachsv[i];
                    danhsachsv[i] = danhsachsv[j];
                    danhsachsv[j] = phu;
                }
            }
        }
        system.out.print("nhap ten sinh vien can tim so thu tu: ");
        string timsv = input.nextline();
        int phu = 0;
        for (int i=0; i<n; i++) {
                if (danhsachsv[i].equals(timsv)) {
                    system.out.println("so thu tu cua " + timsv + " la " + (i+1));
                    phu = 1;
                    break;
            }
        }
        if (phu == 0) {
            system.out.println("khong co ten " + timsv + " trong danh sach.");
        }
    }
}

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

**tanquadt** · 11-16-2013, 07:00 AM

mình nộp bài nhé (đã tham khảo 2 hàm so sánh của các bạn trước)
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Mã nguồn PHP:


[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]student[/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 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]);               [/color][color=#0000bb]int n[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]printf[/color][color=#007700]([/color][color=#dd0000]"nhap so luong sinh vien: "[/color][color=#007700]);        [/color][color=#0000bb]n [/color][color=#007700]= [/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]string tensv[/color][color=#007700][] = new [/color][color=#0000bb]string[/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 ten sinh vien:"[/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]"sv " [/color][color=#007700]+ [/color][color=#0000bb]i [/color][color=#007700]+ [/color][color=#dd0000]": "[/color][color=#007700]);            [/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();                   }               [/color][color=#ff8000]// sap xep        //string item;        [/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]tensv[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]]) > [/color][color=#0000bb]0[/color][color=#007700]){                    [/color][color=#0000bb]string item [/color][color=#007700]= [/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];                    [/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]];                    [/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]item[/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]"danh sach sv 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=#0000bb]i[/color][color=#007700]+[/color][color=#0000bb]1 [/color][color=#007700]+[/color][color=#dd0000]". "[/color][color=#007700]+ [/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);           }               [/color][color=#ff8000]//tim kiem        [/color][color=#0000bb]string tim[/color][color=#007700];        [/color][color=#0000bb]int k [/color][color=#007700]= [/color][color=#0000bb]0[/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]tim [/color][color=#007700]= [/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextline[/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]++){            if([/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#0000bb]tim[/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]"tim thay ten sinh vien "[/color][color=#007700]+[/color][color=#0000bb]tensv[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);                [/color][color=#0000bb]k [/color][color=#007700]+= [/color][color=#0000bb]1[/color][color=#007700];            }                   }        if([/color][color=#0000bb]k[/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]"khong tim thay!!"[/color][color=#007700]);                }        }       }[/color]

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

**lephiet** · 01-16-2014, 07:00 AM

bài 1:
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Mã nguồn PHP:


[color=#000000]
[/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 input [/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]scanner input2 [/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]j[/color][color=#007700];        [/color][color=#0000bb]string v[/color][color=#007700];        [/color][color=#0000bb]int left[/color][color=#007700], [/color][color=#0000bb]right[/color][color=#007700], [/color][color=#0000bb]mid[/color][color=#007700];        [/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]arrsinhvien [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700][[/color][color=#0000bb]50[/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]n [/color][color=#007700]= [/color][color=#0000bb]input[/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]++) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"sinh vien " [/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]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = [/color][color=#0000bb]input2[/color][color=#007700].[/color][color=#0000bb]nextline[/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]"sinh vien 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]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);        }        [/color][color=#ff8000]// pp chen        [/color][color=#007700]for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]1[/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]v [/color][color=#007700]= [/color][color=#0000bb]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];            [/color][color=#0000bb]j [/color][color=#007700]= [/color][color=#0000bb]i[/color][color=#007700];            while ( ([/color][color=#0000bb]j[/color][color=#007700]> [/color][color=#0000bb]0[/color][color=#007700]) && ([/color][color=#0000bb]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]-[/color][color=#0000bb]1[/color][color=#007700]].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]v[/color][color=#007700])> [/color][color=#0000bb]0[/color][color=#007700]) ) {                [/color][color=#0000bb]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]-[/color][color=#0000bb]1[/color][color=#007700]];                [/color][color=#0000bb]j[/color][color=#007700]--;                           }            [/color][color=#0000bb]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]j[/color][color=#007700]] = [/color][color=#0000bb]v[/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]"danh sach sinh vien 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]"sinh vien 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]arrsinhvien[/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 ten sinh vien muon tim:"[/color][color=#007700]);        [/color][color=#0000bb]v [/color][color=#007700]= [/color][color=#0000bb]input2[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#ff8000]//tìm kiếm nhị phân        [/color][color=#0000bb]left [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700];        [/color][color=#0000bb]right [/color][color=#007700]= [/color][color=#0000bb]n[/color][color=#007700]-[/color][color=#0000bb]1[/color][color=#007700];        while ( [/color][color=#0000bb]left [/color][color=#007700]<= [/color][color=#0000bb]right[/color][color=#007700]) {            [/color][color=#0000bb]mid [/color][color=#007700]= ([/color][color=#0000bb]left [/color][color=#007700]+ [/color][color=#0000bb]right[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700];            if ( [/color][color=#0000bb]v[/color][color=#007700].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]mid[/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]"tim thay sinh vien co ten: " [/color][color=#007700]+ [/color][color=#0000bb]v [/color][color=#007700]+ [/color][color=#dd0000]" o vi tri: " [/color][color=#007700]+ [/color][color=#0000bb]mid[/color][color=#007700]);                break;            }            else            if ( [/color][color=#0000bb]v[/color][color=#007700].[/color][color=#0000bb]compareto[/color][color=#007700]([/color][color=#0000bb]arrsinhvien[/color][color=#007700][[/color][color=#0000bb]mid[/color][color=#007700]])> [/color][color=#0000bb]0[/color][color=#007700])                [/color][color=#0000bb]left [/color][color=#007700]= [/color][color=#0000bb]mid [/color][color=#007700]+ [/color][color=#0000bb]1[/color][color=#007700];            else                [/color][color=#0000bb]right [/color][color=#007700]= [/color][color=#0000bb]mid [/color][color=#007700]- [/color][color=#0000bb]1[/color][color=#007700];          }        if ([/color][color=#0000bb]left [/color][color=#007700]> [/color][color=#0000bb]right[/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]"không tim thay sinh vien: " [/color][color=#007700]+ [/color][color=#0000bb]v[/color][color=#007700]);    }[/color]

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

**huytranlnnnn** · 02-15-2014, 07:00 AM

nộp bài:

Mã:

package bai10;
 
import java.util.scanner ;
 
public class break_and_continue {
 
    public static void main (string[] args){
        /*------------------khai bao du lieu---------------------*/
        long begin = system.currenttimemillis();
        int i, j, n;
        scanner strnhap = new scanner (system.in);
        scanner intnhap = new scanner (system.in);
        system.out.print("nhap so luong sinh vien: ");
        n = intnhap.nextint();
       
        string [] strhoten = new string [n];
        for (i=0 ; i< n ; i++){
            system.out.print ("sinh vien thu "+(i+1)+ " : ");
            strhoten[i]= strnhap.nextline();
        }
        system.out.println ("-----danh sach sinh vien da nhap------");
        for (i=0 ; i< n ; i++){
            system.out.println ((i+1)+ ": " + strhoten[i]);
        }
        long end = system.currenttimemillis();
       
        system.out.print("--thoi gian thuc thi nhap du lieu-- : " + (end-begin) + "
");
        /*------------------khai bao du lieu---------------------*/
       
       
        /*------------------sap xep du lieu theo thu tu a,b,c---------------------*/
        long begin1 = system.currenttimemillis();
       
        for (i=0; i<n ; i++){
            for (j=i+1;j<n ; j++){
                if (strhoten[i].comparetoignorecase(strhoten[j])>0){
                    string tam = strhoten[i];
                    strhoten[i] = strhoten[j];
                    strhoten[j] = tam ;
                }
            }
        }
       
        system.out.println("---- danh sach sinh vien sau khi sap xep---");
        for (i=0 ; i< n ; i++)
            system.out.println ((i+1)+ ": " + strhoten[i]);
        long end1 = system.currenttimemillis();
        system.out.println("thoi gian thuc sap xep: " + (end1-begin1));
        /*------------------sap xep du lieu theo thu tu a,b,c---------------------*/
       
        /*tim kiem theo phuong phap nhi phan*/
        for (i = 0; i < n ; i++)
            system.out.println((i + 1) + " " + strhoten[i]);
        //search.
        system.out.print ("ten sinh vien can tim: ");
        string name = strnhap.nextline();
       
        int left=0 , right = n-1 , middle;
            do {
                middle = (left+right)/2;
                if (name.equals(strhoten[middle]))
                    break;
                else
                {
                    if (strhoten[middle].compareto(name) > 0 )
                        right = middle - 1;
                    else
                        left = middle + 1;
                }
            } while (left <= right);
            if (left <= right)
                system.out.println("sinh vien "+name+" o vi tri thu: " +(middle+1));
            else
                system.out.println("khong ton tai") ;
           
        /*tim kiem theo phuong phap nhi phan*/
    }
}

có nghiên cứu phần compareto, pp nhị phân search tại : http://hus.edu.vn/thcs/bai5.html

Chủ đề: Bài 10: Break và Continue trong Java

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