Bài 22: Try, catch, finally trong Java

[vnmarts]

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

btvn - try/catch (open)
btvn - try/catch (close)

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

[color=#000000]
package baitapvenha[/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]/*** làm lại bài giải phương trình ax + b = 0 . lập trình hướng đối tượng. các hệ* số nhập vào từ bàn phím. sử dụng try - catch để bẫy các lỗi khi nhập sai kiểu* dữ liệu, ví dụ nhập số lại nhập chữ. bẫy lỗi chia cho 0.*/[/color][color=#007700]public class [/color][color=#0000bb]buoi22_trycatch [/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]phuongtrinh pt [/color][color=#007700]= new [/color][color=#0000bb]phuongtrinh[/color][color=#007700]();          [/color][color=#0000bb]pt[/color][color=#007700].[/color][color=#0000bb]nhapheso[/color][color=#007700]();          [/color][color=#0000bb]pt[/color][color=#007700].[/color][color=#0000bb]giaipt[/color][color=#007700]();     }} class [/color][color=#0000bb]phuongtrinh [/color][color=#007700]{     private [/color][color=#0000bb]int a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700];     public [/color][color=#0000bb]void nhapheso[/color][color=#007700]() {          [/color][color=#0000bb]scanner sc [/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 he so cho phuong trinh:"[/color][color=#007700]);          try {                 [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"a = "[/color][color=#007700]);                 [/color][color=#0000bb]seta[/color][color=#007700]( [/color][color=#0000bb]sc[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());                 [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"b = "[/color][color=#007700]);                 [/color][color=#0000bb]setb[/color][color=#007700]([/color][color=#0000bb]sc[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());           } catch ([/color][color=#0000bb]exception e[/color][color=#007700]) {                  [/color][color=#ff8000]// todo: handle exception                  [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"error: "[/color][color=#007700]+[/color][color=#0000bb]e[/color][color=#007700]);           }      }      public [/color][color=#0000bb]void giaipt[/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]"phuong trinh co nghiem: "[/color][color=#007700]);          try {                  [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x = "[/color][color=#007700]+(float)(-[/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]a[/color][color=#007700]));          } catch ([/color][color=#0000bb]exception e[/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]"error: "[/color][color=#007700]+[/color][color=#0000bb]e[/color][color=#007700]);                 [/color][color=#ff8000]// todo: handle exception          [/color][color=#007700]}     }      public [/color][color=#0000bb]float geta[/color][color=#007700]() {           return [/color][color=#0000bb]a[/color][color=#007700];     }      public [/color][color=#0000bb]void seta[/color][color=#007700]([/color][color=#0000bb]int a[/color][color=#007700]) {           [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700];     }      public [/color][color=#0000bb]float getb[/color][color=#007700]() {          return [/color][color=#0000bb]b[/color][color=#007700];     }      public [/color][color=#0000bb]void setb[/color][color=#007700]([/color][color=#0000bb]int b[/color][color=#007700]) {           [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700];     }}[/color] 

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

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

btvn - try/catch (open)
btvn - try/catch (close)

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

[color=#000000]
package baitapvenha[/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]/*** làm lại bài giải phương trình ax + b = 0 . lập trình hướng đối tượng. các hệ* số nhập vào từ bàn phím. sử dụng try - catch để bẫy các lỗi khi nhập sai kiểu* dữ liệu, ví dụ nhập số lại nhập chữ. bẫy lỗi chia cho 0.*/[/color][color=#007700]public class [/color][color=#0000bb]buoi22_trycatch [/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]phuongtrinh pt [/color][color=#007700]= new [/color][color=#0000bb]phuongtrinh[/color][color=#007700]();          [/color][color=#0000bb]pt[/color][color=#007700].[/color][color=#0000bb]nhapheso[/color][color=#007700]();          [/color][color=#0000bb]pt[/color][color=#007700].[/color][color=#0000bb]giaipt[/color][color=#007700]();     }} class [/color][color=#0000bb]phuongtrinh [/color][color=#007700]{     private [/color][color=#0000bb]int a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700];     public [/color][color=#0000bb]void nhapheso[/color][color=#007700]() {          [/color][color=#0000bb]scanner sc [/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 he so cho phuong trinh:"[/color][color=#007700]);          try {                 [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"a = "[/color][color=#007700]);                 [/color][color=#0000bb]seta[/color][color=#007700]( [/color][color=#0000bb]sc[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());                 [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"b = "[/color][color=#007700]);                 [/color][color=#0000bb]setb[/color][color=#007700]([/color][color=#0000bb]sc[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());           } catch ([/color][color=#0000bb]exception e[/color][color=#007700]) {                  [/color][color=#ff8000]// todo: handle exception                  [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"error: "[/color][color=#007700]+[/color][color=#0000bb]e[/color][color=#007700]);           }      }      public [/color][color=#0000bb]void giaipt[/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]"phuong trinh co nghiem: "[/color][color=#007700]);          try {                  [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x = "[/color][color=#007700]+(float)(-[/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]a[/color][color=#007700]));          } catch ([/color][color=#0000bb]exception e[/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]"error: "[/color][color=#007700]+[/color][color=#0000bb]e[/color][color=#007700]);                 [/color][color=#ff8000]// todo: handle exception          [/color][color=#007700]}     }      public [/color][color=#0000bb]float geta[/color][color=#007700]() {           return [/color][color=#0000bb]a[/color][color=#007700];     }      public [/color][color=#0000bb]void seta[/color][color=#007700]([/color][color=#0000bb]int a[/color][color=#007700]) {           [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700];     }      public [/color][color=#0000bb]float getb[/color][color=#007700]() {          return [/color][color=#0000bb]b[/color][color=#007700];     }      public [/color][color=#0000bb]void setb[/color][color=#007700]([/color][color=#0000bb]int b[/color][color=#007700]) {           [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700];     }}[/color] 

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

mình thấy bài này ổn nhất so với đề bài tiasangmoi92
đưa ra đúng ko mọi người

[a93kimvijjx]

sao mình gọi phương thức xuất cố tình cho a ==0 để cho lỗi mà chương trình ko chạy vào catch vậy mọi người, với ở phương thức nhập nếu mình muốn người dùng nếu nhập hệ số a là chữ thì nó sẽ cho người dùng nhập lại hệ số a là số thì phải làm ntn . thank all anh em

[color=#000000]
 [/color][color=#007700]class [/color][color=#0000bb]phuongtrinh[/color][color=#007700]{private [/color][color=#0000bb]float a[/color][color=#007700];private [/color][color=#0000bb]float b[/color][color=#007700];  public [/color][color=#0000bb]float geta[/color][color=#007700]() {return [/color][color=#0000bb]a[/color][color=#007700];}public [/color][color=#0000bb]void seta[/color][color=#007700]([/color][color=#0000bb]float a[/color][color=#007700]) {[/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700];}public [/color][color=#0000bb]float getb[/color][color=#007700]() {return [/color][color=#0000bb]b[/color][color=#007700];}public [/color][color=#0000bb]void setb[/color][color=#007700]([/color][color=#0000bb]float b[/color][color=#007700]) {[/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700];}  public [/color][color=#0000bb]void nhap[/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]); try {[/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 he so a :"[/color][color=#007700]);[/color][color=#0000bb]seta[/color][color=#007700]([/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]()); } catch ([/color][color=#0000bb]exception e[/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]"loi nhap chu "[/color][color=#007700]);[/color][color=#ff8000]// todo: handle exception[/color][color=#007700]}  try {[/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 he so b :"[/color][color=#007700]);[/color][color=#0000bb]setb[/color][color=#007700]([/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]()); } catch ([/color][color=#0000bb]exception e[/color][color=#007700]) {[/color][color=#ff8000]// todo: handle exception[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"loi nhap chu "[/color][color=#007700]);} } public [/color][color=#0000bb]void xuat [/color][color=#007700](){try {[/color][color=#0000bb]float a1 [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700];[/color][color=#0000bb]float b1 [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700];[/color][color=#0000bb]float x [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]a[/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]"nghiem cua phuong trinh la x = "[/color][color=#007700]+(-[/color][color=#0000bb]x[/color][color=#007700]));} catch ([/color][color=#0000bb]exception e[/color][color=#007700]) {[/color][color=#ff8000]// todo: handle exception[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"loi b = 0"[/color][color=#007700]);} }     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string args [/color][color=#007700][]){[/color][color=#0000bb]phuongtrinh pt [/color][color=#007700]= new [/color][color=#0000bb]phuongtrinh[/color][color=#007700]();[/color][color=#0000bb]pt[/color][color=#007700].[/color][color=#0000bb]nhap[/color][color=#007700]();[/color][color=#0000bb]pt[/color][color=#007700].[/color][color=#0000bb]xuat[/color][color=#007700]();}        [/color] 

[trungvn2092]

<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>

sao mình gọi phương thức xuất cố tình cho a ==0 để cho lỗi mà chương trình ko chạy vào catch vậy mọi người, với ở phương thức nhập nếu mình muốn người dùng nếu nhập hệ số a là chữ thì nó sẽ cho người dùng nhập lại hệ số a là số thì phải làm ntn . thank all anh em

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

@tuanleedragon: cái lỗi mà bạn nói là cố tình nhập a thì nó k ra ấy mình cũng đã bị vì do bạn dùng biền float nên có thể do hàm hỗ trợ của java nó đưa ra là -indentify gì gì đó đúng k ??? mình cũng k rõ nên mình quyết định là chuyển sang kiểu int thì lại catch được lỗi mình cũng k hiểu sao lại thế

[thugame9285]

[color=#000000]
package lesson[/color][color=#007700];    [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]inputmismatchexception[/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]/** * * @author legendtk84 */[/color][color=#007700]public class [/color][color=#0000bb]lesson22 [/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]giaiphuongtrinh pt [/color][color=#007700]= new [/color][color=#0000bb]giaiphuongtrinh[/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]"ax+b=0"[/color][color=#007700]);        [/color][color=#0000bb]pt[/color][color=#007700].[/color][color=#0000bb]en[/color][color=#007700]();    }}class [/color][color=#0000bb]giaiphuongtrinh [/color][color=#007700]{    [/color][color=#0000bb]scanner scan1 [/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]int a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700];        public [/color][color=#0000bb]void en[/color][color=#007700](){        try{            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap a: "[/color][color=#007700]); [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]scan1[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();                                }catch([/color][color=#0000bb]inputmismatchexception e1[/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]"co loi gi do: a phai la so nguyen "[/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]e1[/color][color=#007700].[/color][color=#0000bb]tostring[/color][color=#007700]());        }        try {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap b: "[/color][color=#007700]); [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]scan1[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        }catch([/color][color=#0000bb]inputmismatchexception e1[/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]"co loi gi do: b phai la so nguyen "[/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]e1[/color][color=#007700].[/color][color=#0000bb]tostring[/color][color=#007700]());        }        try {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x= "[/color][color=#007700]+(-[/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]a[/color][color=#007700]));        }catch([/color][color=#0000bb]arithmeticexception e1[/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]e1[/color][color=#007700].[/color][color=#0000bb]tostring[/color][color=#007700]());        }                                                          }}[/color] 

[anhphamthe]

<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=#007700]public class [/color][color=#0000bb]bai1_unit22 [/color][color=#007700]{        [/color][color=#ff8000]/*    làm lại bài giải phương trình ax + b = 0 . lập trình hướng đối tượng.    các hệ số nhập vào từ bàn phím. sử dụng try - catch để bẫy các     lỗi khi nhập sai kiểu dữ liệu, ví dụ nhập số lại nhập chữ. bẫy lỗi chia cho 0.    */    [/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]ptbacnhat p [/color][color=#007700]= new [/color][color=#0000bb]ptbacnhat[/color][color=#007700]();        [/color][color=#0000bb]p[/color][color=#007700].[/color][color=#0000bb]nhap[/color][color=#007700]();        [/color][color=#0000bb]p[/color][color=#007700].[/color][color=#0000bb]giaipt[/color][color=#007700]();    }}    class [/color][color=#0000bb]ptbacnhat [/color][color=#007700]{    private [/color][color=#0000bb]int a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700];[/color][color=#ff8000]// cho nay de kieu int thi moi bat duoc loi    // con de float, double thi no cho nghiem x=nan    // ko hieu lam, de tim hieu sau, tien toi cac bai khac da    [/color][color=#007700]public [/color][color=#0000bb]int geta[/color][color=#007700]() {        return [/color][color=#0000bb]a[/color][color=#007700];    }        public [/color][color=#0000bb]void seta[/color][color=#007700]([/color][color=#0000bb]int a[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700];    }        public [/color][color=#0000bb]int getb[/color][color=#007700]() {        return [/color][color=#0000bb]b[/color][color=#007700];    }        public [/color][color=#0000bb]void setb[/color][color=#007700]([/color][color=#0000bb]int b[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700];    }                        public [/color][color=#0000bb]void nhap[/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]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap he so cho phuong trinh:"[/color][color=#007700]);        try {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"a="[/color][color=#007700]);            [/color][color=#0000bb]seta[/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"b="[/color][color=#007700]);            [/color][color=#0000bb]setb[/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());        } catch ([/color][color=#0000bb]exception e[/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]"error: " [/color][color=#007700]+ [/color][color=#0000bb]e[/color][color=#007700]);        }    }        public [/color][color=#0000bb]void giaipt[/color][color=#007700]() {        try {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x=" [/color][color=#007700]+ -[/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]a[/color][color=#007700]);        } catch ([/color][color=#0000bb]exception e[/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]"error: " [/color][color=#007700]+ [/color][color=#0000bb]e[/color][color=#007700]);        }    }}[/color] 

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

[quatet200k]

bài hay quá

[em07hoc]

<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 license header, choose license headers in project properties.* to change this template file, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package bai22[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]inputmismatchexception[/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]/**** @author tran*/[/color][color=#007700]public class [/color][color=#0000bb]trycatchfinal [/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]throws myexception [/color][color=#007700]{        [/color][color=#0000bb]ptbacnhat a [/color][color=#007700]= new [/color][color=#0000bb]ptbacnhat[/color][color=#007700]();        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]nhap[/color][color=#007700]();        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]timnghiem[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]geta[/color][color=#007700](), [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]getb[/color][color=#007700]());    }}class [/color][color=#0000bb]ptbacnhat[/color][color=#007700]{    private [/color][color=#0000bb]int a[/color][color=#007700];    private [/color][color=#0000bb]int b[/color][color=#007700];        public [/color][color=#0000bb]int geta[/color][color=#007700]() {        return [/color][color=#0000bb]a[/color][color=#007700];    }        public [/color][color=#0000bb]void seta[/color][color=#007700]([/color][color=#0000bb]int a[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700];    }        public [/color][color=#0000bb]int getb[/color][color=#007700]() {        return [/color][color=#0000bb]b[/color][color=#007700];    }        public [/color][color=#0000bb]void setb[/color][color=#007700]([/color][color=#0000bb]int b[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700];    }               public [/color][color=#0000bb]void nhap[/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]);       try{        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"a= "[/color][color=#007700]);        [/color][color=#0000bb]seta[/color][color=#007700]([/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"b= "[/color][color=#007700]);        [/color][color=#0000bb]setb[/color][color=#007700]([/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());       }catch ([/color][color=#0000bb]inputmismatchexception e[/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]"error "[/color][color=#007700]+[/color][color=#0000bb]e[/color][color=#007700]);       }    }    public [/color][color=#0000bb]void timnghiem[/color][color=#007700]([/color][color=#0000bb]int a[/color][color=#007700],[/color][color=#0000bb]int b[/color][color=#007700]){       if([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]0[/color][color=#007700]){         try{            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x= "[/color][color=#007700]+ -[/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]a[/color][color=#007700]);            }catch([/color][color=#0000bb]exception e1[/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]"error: "[/color][color=#007700]+[/color][color=#0000bb]e1[/color][color=#007700]);       }             }else{           [/color][color=#0000bb]float m [/color][color=#007700]= [/color][color=#0000bb]a[/color][color=#007700];           [/color][color=#0000bb]float n [/color][color=#007700]= [/color][color=#0000bb]b[/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]"x= "[/color][color=#007700]+ (float)(-[/color][color=#0000bb]m[/color][color=#007700]/[/color][color=#0000bb]n[/color][color=#007700]));       }    }}[/color] 

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

[bmhy752]

<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>
import java.util.*;
public class try_catch {
public static void main(string[]args){
try {
scanner snhap=new scanner(system.in);
system.out.println("giải pt ax+b=0");
system.out.print("nhập số a: ");
int a=snhap.nextint();
system.out.print("nhập số b: ");
int b=snhap.nextint();

system.out.println("nghiệm của phương trình là: "+b / a);
} catch (inputmismatchexception e) {
system.out.print("có lỗi xảy ra: "+e);
}catch(arithmeticexception e){
system.out.print("có lỗi xảy ra: "+e);
}catch(exception e){
system.out.println("có lỗi xảy ra: "+e);
}

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