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Multiple catch blocks in java


Multiple catch blocks:

If more than one exception can occur in one try block, than we can use multiple catch blocks to provide appropriate handler to different exception objects.

Note: in case of multiple catch blocks, blocks must be placed from specific handler to general handler.

Syntax of try block with multiple catch blocks:

try{

       //block of statements

}catch(Exception handler class subclass ){

} catch(Exception handler super class){

}

Example:

MultipleCatchExample.java

/**
 * This is a simple program of handling multiple exception.
 * @author codesjava
 */
class ArithmaticTest{
	int array[]={10,20,30,40};
	int num1 = 50;
	int num2 = 10;
 
	/**
	 * This method is used to show the handling multiple exception.
	 * @author codesjava
	 */
	public void multipleCatchTest(){
	  try{
	   //java.lang.ArithmeticException here if num2 = 0.
	   System.out.println(num1/num2);
	   System.out.println("4th element of given array = " + array[3]);
 
	   //ArrayIndexOutOfBoundsException here.
	   System.out.println("5th element of given array = " + array[4]);
 
           //catch ArrayIndexOutOfBoundsException here.
           }catch(ArrayIndexOutOfBoundsException e){
	     //print exception.
	     System.out.println(e);
	   }catch(ArithmeticException e){//catch ArithmeticException here.
	     //print exception.
	     System.out.println(e);
	   }catch(Exception e){//catch exception here.
	     //print exception.
	     System.out.println(e);
	   }
 
           System.out.println("Remaining code after exception handling.");
	}
}
 
public class MultipleCatchExample {
	public static void main(String args[]){
		//creating ArithmaticTest object
		ArithmaticTest obj =  new ArithmaticTest();
 
		//method call
		obj.multipleCatchTest();
	}
}

Output:

5
4th element of given array = 40
java.lang.ArrayIndexOutOfBoundsException: 4
Remaining code after exception handling.

Download this example.

Compile time error if catch blocks are not placed from specific handler to general handler.

Example:

ExceptionHandlingExample.java

/**
 * This is a simple program used to show 
 * the handling multiple exception.
 * @author codesjava
 */
class ArithmaticTest{
	int array[]={10,20,30,40};
	int num1 = 50;
	int num2 = 10;
 
	/**
	 * This method is used to show the handling multiple exception.
	 * @author codesjava
	 */
	public void multipleCatchTest(){
	  try{
	   //java.lang.ArithmeticException here if num2 = 0.
	   System.out.println(num1/num2);
	   System.out.println("4th element of given array = " + array[3]);
 
	   //ArrayIndexOutOfBoundsException here.
	   System.out.println("5th element of given array = " + array[4]);
	   }catch(Exception e){//catch exception here.
	       //print exception.
	       System.out.println(e);
           //Compile time error here.
	   }catch(ArrayIndexOutOfBoundsException e){
		//print exception.
		System.out.println(e);
	   }catch(ArithmeticException e){//catch ArithmeticException here.
		//print exception.
		System.out.println(e);
	   }
 
	  System.out.println("Remaining code after exception handling.");
	}
}
 
public class ExceptionHandlingExample {
	public static void main(String args[]){
		//creating ArithmaticTest object
		ArithmaticTest obj =  new ArithmaticTest();
 
		//method call
		obj.multipleCatchTest();
	}
}

Output:

Exception in thread "main" java.lang.Error: 
Unresolved compilation problems:
 Unreachable catch block for ArrayIndexOutOfBoundsException. 
It is already handled by the catch block for Exception
Unreachable catch block for ArithmeticException. 
It is already handled by the catch block for Exception
at com.javawithease.business.ArithmaticTest.multipleCatchTest
(ExceptionHandlingExample.java:28)
at com.javawithease.business.ExceptionHandlingExample.main
(ExceptionHandlingExample.java:46)

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Next Topic: Nested try block in java with example.
Previous Topic: try and catch blocks in java with example.

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