raising an exception in java eclipse, help

Hello,

I have an assignment and I am really stuck on it,

1. Create a new Eclipse project.
2. Within this project, define an InvalidAgeException:
a. This should be a checked exception which extends from the Exception
class


is it something like this?

public class InvalidAgeException extends Exception {

how do i know its an checked exception?

Sorry if i dont make sense,....

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