CHAPTER 57 — Buttons and Actions

The previous chapters have introduced event-driven programming and the three parts of a GUI application:

1. The Graphical User Interface:
   • Container objects — JFrame
   • Other objects — buttons, text fields, others.
2. Listener methods:
   • Each GUI object has a listener object registered for it for each type of event it generates for which a response is expected.
3. Application code.
• The purpose of the program.

This chapter discusses how to add a button to a frame and how to register a listener for its events.

Chapter Topics:

• Adding a button to a frame.
• The content pane of a frame.
• Layout managers.
• Action listeners.
• Registering a listener with a GUI component.
• The actionPerformed() method.
• Changing the background color of a frame.