Swing II - Java - page 963

Display 18.1 Methods in the Interface

WindowListener

The WindowListener interface and the WindowEvent class are in the package java.awt.event .

public void windowOpened(WindowEvent e)

Invoked when a window has been opened.

public void windowClosing(WindowEvent e)

Invoked when a window is in the process of being closed. Clicking the close-window button causes
an invocation of this method.

public void windowClosed(WindowEvent e)

Invoked when a window has been closed.

public void windowIconified(WindowEvent e)

Invoked when a window is iconified. When you click the minimize button in a JFrame , it is iconified.

public void windowDeiconified(WindowEvent e)

Invoked when a window is deiconified. When you activate a minimized window, it is deiconified.

public void windowActivated(WindowEvent e)

Invoked when a window is activated. When you click in a window, it becomes the activated window.
Other actions can also activate a window.

public void windowDeactivated(WindowEvent e)

Invoked when a window is deactivated. When a window is activated, all other windows are deacti-
vated. Other actions can also deactivate a window.

The Interface

WindowListener

When the user clicks any of the three standard buttons (for closing the window, min-

imizing the window, and resizing the window), that generates a window event. Window
events are sent to window listeners. In order to be a window listener, a class must imple-
ment the

JFrame

WindowListener interface. The method headings for the WindowListener inter-

face are given in Display 18.1.