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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 codesjava
 */
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 codesjava
	 */
	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.

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