testwindowevent.java

此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码。

// TestWindowEvent.java: Create a frame to test window events
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;

public class TestWindowEvent extends JFrame
  implements WindowListener
{
  // Main method
  public static void main(String[] args)
  {
    TestWindowEvent frame = new TestWindowEvent();
    // frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setTitle("Test Window Event");
    frame.setSize(100, 80);
    frame.setVisible(true);
  }

  // Default constructor
  public TestWindowEvent()
  {
    super();
    addWindowListener(this);  // Register listener
  }

  /**
   * Handler for window deiconified event
   * Invoked when a window is changed from a minimized
   * to a normal state.
   */
  public void windowDeiconified(WindowEvent event)
  {
    System.out.println("Window deiconified");
  }

  /**
   * Handler for window iconified event
   * Invoked when a window is changed from a normal to a
   * minimized state. For many platforms, a minimized window
   * is displayed as the icon specified in the window's
   * iconImage property.
   * @see Frame#setIconImage
   */
  public void windowIconified(WindowEvent event)
  {
    System.out.println("Window iconified");
  }

  /**
   * Handler for window activated event
   * Invoked when the window is set to be the user's
   * active window, which means the window (or one of its
   * subcomponents) will receive keyboard events.
   */
  public void windowActivated(WindowEvent event)
  {
    System.out.println("Window activated");
  }

  /**
   * Handler for window deactivated event
   * Invoked when a window is no longer the user's active
   * window, which means that keyboard events will no longer
   * be delivered to the window or its subcomponents.
   */
  public void windowDeactivated(WindowEvent event)
  {
    System.out.println("Window deactivated");
  }

  /**
   * Handler for window opened event
   * Invoked the first time a window is made visible.
   */
  public void windowOpened(WindowEvent event)
  {
    System.out.println("Window opened");
  }

  /**
   * Handler for window closing event
   * Invoked when the user attempts to close the window
   * from the window's system menu.  If the program does not
   * explicitly hide or dispose the window while processing
   * this event, the window close operation will be cancelled.
   */
  public void windowClosing(WindowEvent event)
  {
    System.out.println("Window closing");
  }

  /**
   * Handler for window closed event
   * Invoked when a window has been closed as the result
   * of calling dispose on the window.
   */
  public void windowClosed(WindowEvent event)
  {
    System.out.println("Window closed");
  }
}