WindowListener

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2023-12-01

处理WindowEvent的类应该实现此接口。该类的对象必须在组件中注册。可以使用addWindowListener（）方法注册该对象。

接口声明

以下是java.awt.event.WindowListener接口的声明:

public interface WindowListener
   extends EventListener

接口方法 (Interface methods)

SN	方法和描述
1	void windowActivated(WindowEvent e) 将Window设置为活动Window时调用。
2	void windowClosed(WindowEvent e) 由于在窗口上调用dispose而关闭窗口时调用。
3	void windowClosing(WindowEvent e) 当用户尝试从窗口的系统菜单关闭窗口时调用。
4	void windowDeactivated(WindowEvent e) 当Window不再是活动Window时调用。
5	void windowDeiconified(WindowEvent e) 窗口从最小化状态更改为正常状态时调用。
6	void windowIconified(WindowEvent e) 当窗口从正常状态更改为最小化状态时调用。
7	void windowOpened(WindowEvent e) 第一次使窗口可见时调用。

方法继承

此接口从以下接口继承方法:

java.awt.EventListener

WindowListener示例

使用您选择的任何编辑器创建以下java程序，例如D:/ 》 AWT 》 com 》 iowiki 》 gui 》

AwtListenerDemo.java

package com.iowiki.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 iowiki.");
      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) {
      }
   }   
}

使用命令提示符编译程序。转到D:/ 》 AWT并键入以下命令。

D:\AWT>javac com\iowiki\gui\AwtListenerDemo.java

如果没有错误，那意味着编译成功。使用以下命令运行程序。

D:\AWT>java com.iowiki.gui.AwtListenerDemo

验证以下输出