700: Highlights

• Graphical user interfaces (GUIs) consist of components and containers, both of which have graphical representations.
• An event is a state change at an instant in time. An event is also an instance of the EventObject class.
• If you want to respond to an event associated with a component, then define a listener class that implements a listener interface, either directly or via a listener adapter, and then connect an instance of that listener class to the component. Your listener-class definition will include methods that are actuated in response to events.