Java User Defined Exception Example

Chapter: Exception Handling Last Updated: 05-09-2016 17:02:06 UTC

Program:

            /* ............... START ............... */
                
class WrongInputException extends Exception {
	WrongInputException(String s) {
		super(s);
	}
}

class Input {
	void method() throws WrongInputException {
		throw new WrongInputException("Wrong input");
	}
}

public class JavaUserDefinedException {

	public static void main(String[] args) {
		try {
			new Input().method();
		} catch (WrongInputException wie) {
			System.out.println(wie.getMessage());
		}
	}
}
                /* ............... END ............... */
        

Output

Wrong input

Notes:

  • User defined exceptions in java are also known as Custom exceptions.
  • User defined exception needs to inherit (extends) Exception class in order to act as an exception.
  • throw keyword is used to throw such exceptions.

Tags

User Defined Exception, Exception, Java

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