AWT » WindowAdapter 類

WindowAdapter 類

介紹

WindowAdapter類接收視窗事件是一個抽象類（介面卡）。這個類的所有方法都是空的。這個類是方便的類建立偵聽器物件。

類宣告

以下是宣告用於對java.awt.event.WindowAdapter類：

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

類別建構函式

S.N. 建構函式＆說明
1 WindowAdapter() 

類方法

S.N. 方法＆說明
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.

繼承的方法

這個類繼承的方法從以下類：

  • java.lang.Object

WindowAdapter 範例

選擇使用任何編輯器建立以下java程式 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);
   }
}

編譯程式，使用命令提示字元。進入到D:/> AWT，然後鍵入以下命令。

D:AWT>javac comyiibaiguiAwtAdapterDemo.java

如果沒有錯誤出現，這意味著編譯成功。使用下面的命令來執行程式。

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

驗證下面的輸出

AWT WindowAdapter