• August 29, 2014
  • Core Java
  • Comments Off on Nested try block in java

Nested try block in java

Nested try block: 

try block inside try block is known as nested try block.

Note: Exception handler must be also nested in case try block is nested.

Syntax of nested try block:

try{         //block of statements

         try{

                  //block of statements

            }catch(Exception handler class){

               }

}catch(Exception handler class){

}

Example:

NestedTryExample.java

/**
 * This is a simple program used to show 
 * the use of nested try block.
 * @author javawithease
 */
class ArithmaticTest{
	int array[]={10,20,30,40};
	int num1 = 50;
	int num2 = 10;
 
	/**
	 * This method is used to show the use of nested try block.
	 * @author javawithease
	 */
	public void multipleCatchTest(){
	 try{
	  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]);
           //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);
	   }
 
	   int num = Integer.parseInt("30");
	   System.out.println(num);
          //catch NumberFormatException here.
	  }catch(NumberFormatException e){
		//print exception.
		System.out.println(e);
	  }
 
	 System.out.println("Remaining code after exception handling.");
       }
}
 
public class NestedTryExample {
	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
30
Remaining code after exception handling.

Download this example.
 
Next Topic: Finally in java with example.
Previous Topic: Multiple catch blocks in java with example.

Related Topics:

Some important terms for Exception Handling.
Exception handling in java.
try and catch blocks in java with example.
Multiple catch blocks in java with example.
Nested try block in java with example.
Finally in java with example.
throw in java with example.
throws in java with example.
Exception propagation in java with example.
Exception handling with method overriding in java.
Custom exception in java with example.
Commonly used exception methods of Throwable class in java.

 


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