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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