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Message:

Scoping

Posted by Edwin van der Elst on December 06, 2000 at 5:04 AM

You don't 'need' innerclasses, but they are usefull in a couple of situations.
An innerclass can access private & protected data from it's outerclass. If the innerclass was a normal class, this data would have to be public or accessable with get/set. Now, you can make just the innerclass public.

For eventhandlers, it is conventient to have an innerclass implement some listener interface, instead of the class itself.