How to create checked/unchecked custom exceptions in Java?

Question

When I create my own exceptions, is it possible to mark them as being checked/unchecked? (using some annotation, maybe?) Or, is extending Exception/RuntimeException the only way of doing it?

Thanks.

What would you suggest as an alternative?

Peter Lawrey
– Peter Lawrey

2011-08-13 09:36:32 +00:00
Commented Aug 13, 2011 at 9:36 — Peter Lawrey
– Peter Lawrey, Commented Aug 13, 2011 at 9:36

GaryF · Accepted Answer · 2011-08-13 09:34:10Z

44

The only way of doing it is to extend Exception (or a subclass thereof) for a checked exception, and extending RuntimeException (or a subclass thereof) for an unchecked exception.

Given how lightweight it is to do that, and the benefits you get from extending those classes, I don't think that's too onerous.

answered Aug 13, 2011 at 9:34

GaryF

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Comments

ayushgp · Accepted Answer · 2018-02-08 13:53:47Z

22

Checked Exception

By extending Exception, you can create a checked exception:

class NotEnoughBalance extends Exception {
     // Implementation
}

Unchecked Exception

By extending RuntimeException, you can create unchecked exception:

class NotEnoughBalance extends RuntimeException {
     // Implementation
}

edited Feb 8, 2018 at 13:53

ayushgp

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answered Oct 26, 2015 at 4:31

SM ANSARI

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1 Comment

Jeen Broekstra Over a year ago

This is not correct. You don't need to extend IOException to create a checked exception. Every exception in Java is a checked exception unless it extends RuntimeException.

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