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In the following example, the Mediator registers all Components and then calls their Set State methods.

A chat room could use the Mediator pattern, or a system where many ‘clients’ each receive a message each time one of the other clients performs an action (for chat rooms, this would be when each person sends a message).

This reduces the dependencies between communicating objects, thereby reducing coupling.

design pattern is one of the twenty-three well-known Go F design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse.

Logic and computation are distributed among these classes.

However, as more classes are added to a program, especially during maintenance and/or refactoring, the problem of communication between these classes may become more complex.

With the mediator pattern, communication between objects is encapsulated within a mediator object.

Objects no longer communicate directly with each other, but instead communicate through the mediator.

Using raw sockets wouldn’t allow for the delegate callbacks (people subscribed to the Mediator class’ Message Received event). Hence here the collaboration pattern is that each participant (here the buttons) communicates to the mediator its activity and the mediator dispatches the expected behavior to the other participants.This makes the program harder to read and maintain.Furthermore, it can become difficult to change the program, since any change may affect code in several other classes.So there is no need to find your mouse and move it over there and click on it. If you, for example, has called a getter-method you can assign the returned object to a variable quickly by hitting alt enter and Net Beans IDE will automatically lookup the type and create a variable for you.


If you have a constructor that takes a parameter you can hit alt enter when the cursor is placed over the parameter and Net Beans will both add a this.variable = variable to the constructor body and also create the field needed in the class (as a private final).

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