介绍

WindowAdapter类接收窗口事件是一个抽象类（适配器）。这个类的所有方法都是空的。这个类是方便的类创建侦听器对象。

类声明

以下是声明用于对java.awt.event.WindowAdapter类：

public abstract class WindowAdapter
   extends Object
      implements WindowListener, WindowStateListener, WindowFocusListener

类的构造函数

S.N.	构造函数＆说明
1	WindowAdapter()

类方法

S.N.	方法＆说明
1	void windowActivated(WindowEvent e)  Invoked when a window is activated.
2	void windowClosed(WindowEvent e)  Invoked when a window has been closed.
3	void windowClosing(WindowEvent e)  Invoked when a window is in the process of being closed.
4	void windowDeactivated(WindowEvent e)  Invoked when a window is de-activated.
5	void windowDeiconified(WindowEvent e)  Invoked when a window is de-iconified.
6	void windowGainedFocus(WindowEvent e)  Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.
7	void windowIconified(WindowEvent e)  Invoked when a window is iconified.
8	void windowLostFocus(WindowEvent e)  Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.
9	void windowOpened(WindowEvent e)  Invoked when a window has been opened.
10	void windowStateChanged(WindowEvent e)  Invoked when a window state is changed.

继承的方法

这个类继承的方法从以下类：

• java.lang.Object

WindowAdapter 实例

选择使用任何编辑器创建以下java程序 D:/ > AWT > com > yiibai > gui >

AwtAdapterDemo

package com.yiibai.gui;

import java.awt.*;
import java.awt.event.*;

public class AwtAdapterDemo {
   private Frame mainFrame;
   private Label headerLabel;
   private Label statusLabel;
   private Panel controlPanel;

   public AwtAdapterDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      AwtAdapterDemo  awtAdapterDemo = new AwtAdapterDemo();        
      awtAdapterDemo.showWindowAdapterDemo();
   }

   private void prepareGUI(){
      mainFrame = new Frame("Java AWT Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      headerLabel = new Label();
      headerLabel.setAlignment(Label.CENTER);
      statusLabel = new Label();        
      statusLabel.setAlignment(Label.CENTER);
      statusLabel.setSize(350,100);

      controlPanel = new Panel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }

   private void showWindowAdapterDemo(){
      headerLabel.setText("Listener in action: WindowAdapter");      

      Button okButton = new Button("OK");

      final Frame aboutFrame = new Frame();
      aboutFrame.setSize(300,200);;
      aboutFrame.setTitle("WindowAdapter Demo");
      aboutFrame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent windowEvent){
               aboutFrame.dispose();
         }        
      });    
      Label msgLabel = new Label("Welcome to yiibai.");
      msgLabel.setAlignment(Label.CENTER);
      msgLabel.setSize(100,100);
      aboutFrame.add(msgLabel);
      aboutFrame.setVisible(true);
   }
}

编译程序，使用命令提示符。进入到D:/> AWT，然后键入以下命令。

D:AWT>javac comyiibaiguiAwtAdapterDemo.java

如果没有错误出现，这意味着编译成功。使用下面的命令来运行程序。

D:AWT>java com.yiibai.gui.AwtAdapterDemo

验证下面的输出