WindowListener

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WindowListener

用于接收窗口事件的侦听器接口。旨在处理窗口事件的类要么实现此接口（及其包含的所有方法），要么扩展抽象类 WindowAdapter（仅重写所需的方法）。

windowClosed(WindowEvent e)； //调用dispose方法关闭窗口

windowClosing(WindowEvent e)； //用户试图从窗口的系统菜单中关闭窗口关闭窗口

windowOpened(WindowEvent e)； //窗口首次变为可见是调用

windowActivated(WindowEvent e)； //激活窗口

windowIconified(WindowEvent e)； //窗口从正常状态变为最小化图标

windowDeiconified(WindowEvent e)； //窗口从最小化状态变为正常状态时调用windowDeactivated(WindowEvent e)； //窗口变为非活动窗口

import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class WindowTest01 implements WindowListener{
    TextArea t=new TextArea(6,30);
    public WindowTest01(){
       Frame f=new Frame("WindowListener演示");
       f.add(t, BorderLayout.CENTER);
       //向窗口添加监听事件
       f.addWindowListener(this);
       f.setSize(400,300);
       f.setVisible(true);
    }

   public void windowOpened(WindowEvent e) {
       // TODO Auto-generated method stub
       t.append("窗口被打开\n");
   }

   public void windowClosing(WindowEvent e) {
       // TODO Auto-generated method stub
       System.exit(0);
   }

   public void windowClosed(WindowEvent e) {
       // TODO Auto-generated method stub
       t.append("用户试图从窗口的系统菜单中关闭窗口关闭窗口\n");
   }

   public void windowIconified(WindowEvent e) {
       // TODO Auto-generated method stub
       t.append("窗口从正常状态变为最小化图标\n");
   }

   public void windowDeiconified(WindowEvent e) {
       // TODO Auto-generated method stub
       t.append("窗口从最小化状态变为正常状态时调用\n");
   }

   public void windowActivated(WindowEvent e) {
       // TODO Auto-generated method stub
       t.append("激活窗口\n");
   }

   public void windowDeactivated(WindowEvent e) {
       // TODO Auto-generated method stub
       t.append("窗口变为非活动窗口\n");
   }

   public static void main(String[] args){
       new WindowTest01();
   }
}

监听实现一般步骤

1.确定事件源，继承监听事件的接口

2.注册监听事件addWindowListener(this);

3.处理事件

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