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Java basics

NullPointerException


In Java NullPointerException is a public class that extends RuntimeExcpetion. The NullPointerException is thrown in Java application or applet when you try to use a null object. The error occurs as you try to call instance method of an object which is null.

Syntax:
public class NullPointerException
extends RuntimeException


Example:

public class exception_example {
 
    public static void main(String []args) {
 
       Integer intval = null;
 
       intval = 20;
 
       int n = intval.intValue();
 
       System.out.println(n);
 
    }
 
}


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