Simple java message dispatching system?

If there is a specific listener interface for each event. Each event is able to issue listeners calls itself. Then, the role of the dispatcher is to identify target listeners and to trigger the event notification on them.

If you want to avoid instanceof, then your only bet is to use inheritance to route a method call to the right method. You cannot use method overloading, since that is decided at compile time by the declared type of the variable you are passing to a method. You have to use inheritance.

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