Java catch multiple exceptions

Java Multi catch block

If you have to perform different tasks at the occurrence of different Exceptions, use java multi catch block.

Let's see a simple example of java multi-catch block.

1. public class TestMultipleCatchBlock{  
2.   public static void main(String args[]){  
3.    try{  
4.     int a[]=new int[5];  
5.     a[5]=30/0;  
6.    }  
7.    catch(ArithmeticException e){System.out.println("task1 is completed");}  
8.    catch(ArrayIndexOutOfBoundsException e){System.out.println("task 2 completed");}  
9.    catch(Exception e){System.out.println("common task completed");}  
10.   
11.    System.out.println("rest of the code...");  
12.  }  
13. }  

Output:task1 completed
       rest of the code...

Rule: At a time only one Exception is occured and at a time only one catch block is executed.

Rule: All catch blocks must be ordered from most specific to most general i.e. catch for ArithmeticException must come before catch for Exception .

1. class TestMultipleCatchBlock1{  
2.   public static void main(String args[]){  
3.    try{  
4.     int a[]=new int[5];  
5.     a[5]=30/0;  
6.    }  
7.    catch(Exception e){System.out.println("common task completed");}  
8.    catch(ArithmeticException e){System.out.println("task1 is completed");}  
9.    catch(ArrayIndexOutOfBoundsException e){System.out.println("task 2 completed");}  
10.    System.out.println("rest of the code...");  
11.  }  
12. }  

Output:

Compile-time error