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You have implemented a window listener by defining a subclass of the
WindowAdapter class, which implements the WindowListener interface.
Now, you proceed to implement a mouse listener by defining a subclass of the
MouseAdapter class, which implements the MouseListener interface.
The MouseListener interface insists on the definition of several
methods, one of which is the mouseClicked method, which is defined
as a do-nothing method in the MouseAdapter class.
In your subclass of the MouseAdapter class, you arrange for
the mouseClicked method to reach into the view that produced the mouse
event, to fetch a value, and to relay that value to model setters.