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State Pattern helps to invoke behavior based on the changes to the state of the object. When ever there is a change to one of the states of the object, the relevant behaviors might also need to change. In state pattern, the State objects handle the behavior on behalf of the context object. This helps in moving the changing behavior implementation to the state objects so that the changing behavior is encapsulated in the state objects.
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http://github.com/java9s/state-patter...
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