The Java™ Tutorials
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How to Write Window Listeners
Trail: Creating a GUI With Swing
Lesson: Writing Event Listeners
Section: Implementing Listeners for Commonly Handled Events

How to Write Window Listeners

This section explains how to implement three kinds of window-related event handlers: WindowListener, WindowFocusListener, and WindowStateListener. All three listeners handle WindowEvent objects. The methods in all three event handlers are implemented by the abstract WindowAdapter class.

When the appropriate listener has been registered on a window (such as a frame or dialog), window events are fired just after the window activity or state has occurred. A window is considered as a "focus owner", if this window receives keyboard input.

The following window activities or states can precede a window event:

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