Java Collections & Util Package

An adapter class provides the default implementation of all methods in an event listener interface. Adapter classes are very useful when you want to process only few of the events that are handled by a particular event listener interface. You can define a new class by extending one of the adapter classes and implement only those events relevant to you.

The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.