784: Mainline

Similarly, the Component class provides view classes with the following:

• Methods, such as addMouseListener, that connect listeners to view instances
• An event-noting mechanism that calls methods, such as mouseClicked to activate listeners

Listener interfaces insist that you define various essential methods:

• Methods, such as mouseClicked, are called by inherited machinery whenever an event occurs.

Listener methods do whatever you tell them to do. Typically, listener methods fetch values from views and relay those values to models.