WindowListener 接口
WindowEvent類的對象應該實現這個接口。類處理一個組件必須註冊。使用addWindowListener（）方法，該對象可以被註冊。
接口聲明
以下是聲明的java.awt.event.WindowListener接口：
public interface WindowListener extends EventListener
接口中的方法
S.N.
方法＆說明
1
void windowActivated(WindowEvent e)
Invoked when the Window is set to be the active Window.
2
void windowClosed(WindowEvent e)
Invoked when a window has been closed as the result of calling dispose on the window.
3
void windowClosing(WindowEvent e)
Invoked when the user attempts to close the window from the window's system menu.
4
void windowDeactivated(WindowEvent e)
Invoked when a Window is no longer the active Window.
5
void windowDeiconified(WindowEvent e)
Invoked when a window is changed from a minimized to a normal state.
6
void windowIconified(WindowEvent e)
Invoked when a window is changed from a normal to a minimized state.
7
void windowOpened(WindowEvent e)
Invoked the first time a window is made visible.
繼承的方法
這個接口繼承的方法從下面的接口：
- java.awt.EventListener
WindowListener示例
選擇使用任何編輯器創建以下java程序 D:/ > AWT > com > yiibai > gui >
AwtListenerDemo
package com.yiibai.gui; import java.awt.*; import java.awt.event.*; public class AwtListenerDemo { private Frame mainFrame; private Label headerLabel; private Label statusLabel; private Panel controlPanel; public AwtListenerDemo(){ prepareGUI(); } public static void main(String[] args){ AwtListenerDemo awtListenerDemo = new AwtListenerDemo(); awtListenerDemo.showWindowListenerDemo(); } 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 showWindowListenerDemo(){ headerLabel.setText("Listener in action: WindowListener"); Button okButton = new Button("OK"); aboutFrame = new Frame(); aboutFrame.setSize(300,200);; aboutFrame.setTitle("WindowListener Demo"); aboutFrame.addWindowListener(new CustomWindowListener()); Label msgLabel = new Label("Welcome to yiibai."); msgLabel.setAlignment(Label.CENTER); msgLabel.setSize(100,100); aboutFrame.add(msgLabel); aboutFrame.setVisible(true); } class CustomWindowListener implements WindowListener { public void windowOpened(WindowEvent e) { } public void windowClosing(WindowEvent e) { aboutFrame.dispose(); } public void windowClosed(WindowEvent e) { } public void windowIconified(WindowEvent e) { } public void windowDeiconified(WindowEvent e) { } public void windowActivated(WindowEvent e) { } public void windowDeactivated(WindowEvent e) { } } }
編譯程序，使用命令提示符。到 D:/ > AWT 然後鍵入以下命令。
D:AWT>javac comyiibaiguiAwtListenerDemo.java
如果沒有錯誤出現，這意味着編譯成功。使用下面的命令來運行程序。
D:AWT>java com.yiibai.gui.AwtListenerDemo
驗證下面的輸出
