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    You register a listener for each event that you are interested in and hence when event happens java calls the listener. Commented Sep 12, 2016 at 9:45
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    This is an example of a callback. Commented Sep 12, 2016 at 9:45
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    The answer is 'nothing'. Predefined interfaces aren't different from application-defined interfaces in any way. The JVM takes precisely zero notice. Only Java code cares. Commented Sep 12, 2016 at 9:53