Extending Exception/RunTimeException in java?

Question

I have below classes.

public class ValidationException extends RuntimeException {


}

and

public class ValidationException          


        

Answer 1

If you extend RuntimeException, you don't need to declare it in the throws clause (i.e. it's an unchecked exception). If you extend Exception, you do (it's a checked exception).

Some people argue that all exceptions should extend from RuntimeException, but if you want to force the user to handle the exception, you should extend Exception instead.