How to throw Exception

This section describes about throwing Exception explicitely in java.

How to throw Exception

Until now, we are catching exceptions that are thrown by the Java run-time system. However, it is possible for your program to throw an exception explicitly, using the throw statement. You can throw exception explicitly as follows :

throw ThrowableInstance ;

ThrowableInstance must be an object of type 'Throwable' or a subclass of 'Throwable'.

Example :

public class ThrowDemo {

	static void DevProc() {
		try {
			throw new NullPointerException("demo");
		} catch (NullPointerException e) {
			System.out.println("Caught inside Devproc.");
			throw e;
		}
	}

	public static void main(String args[]) {
		try {
			DevProc();
		} catch (NullPointerException e) {
			System.out.println("Recaught :" + e);
		}

	}

}

Output :

Download Source Code