ComponentEvent 类应该必须处理实现这个接口。类的对象组件注册。使用addComponentListener()方法，该对象可以被注册。组件事件提出仅供参考。

接口声明

以下是声明 java.awt.event.ComponentListener接口：

public interface ComponentListener
   extends EventListener

接口方法

S.N.	方法 & 描述
1	void componentHidden(ComponentEvent e)  Invoked when the component has been made invisible.
2	void componentMoved(ComponentEvent e)  Invoked when the component's position changes.
3	void componentResized(ComponentEvent e)  Invoked when the component's size changes.
4	void componentShown(ComponentEvent e)  Invoked when the component has been made visible.

方法继承

这个接口从以下接口继承的方法：

• java.awt.EventListener

ComponentListener 例子

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

SwingListenerDemo.java

package com.yiibai.gui;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SwingListenerDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;

   public SwingListenerDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      SwingListenerDemo  swingListenerDemo = new SwingListenerDemo();  
      swingListenerDemo.showComponentListenerDemo();
   }

   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        

      statusLabel.setSize(350,100);
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
	        System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   
   private void showComponentListenerDemo(){
      headerLabel.setText("Listener in action: ComponentListener");      
   
      JPanel panel = new JPanel();      
      panel.setBackground(Color.magenta);            

      JLabel msglabel = 
      new JLabel("Welcome to TutorialsPoint SWING Tutorial."
         ,JLabel.CENTER);        
      panel.add(msglabel);
	
      msglabel.addComponentListener(new CustomComponentListener());      
      controlPanel.add(panel);
      mainFrame.setVisible(true);  
   }
   
   class CustomComponentListener implements ComponentListener {
 
      public void componentResized(ComponentEvent e) {
         statusLabel.setText(statusLabel.getText() 
         + e.getComponent().getClass().getSimpleName() + " resized. ");
      }
 
      public void componentMoved(ComponentEvent e) {
         statusLabel.setText(statusLabel.getText() 
         + e.getComponent().getClass().getSimpleName() + " moved. ");
      }
 
      public void componentShown(ComponentEvent e) {
         statusLabel.setText(statusLabel.getText() 
         + e.getComponent().getClass().getSimpleName() + " shown. ");
      }
 
      public void componentHidden(ComponentEvent e) {
         statusLabel.setText(statusLabel.getText() 
         + e.getComponent().getClass().getSimpleName() + " hidden. ");
      }
   }
}

编译程序，使用命令提示符。到 D:/ > SWING 然后输出以下命令。

D:SWING>javac comyiibaiguiSwingListenerDemo.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:SWING>java com.yiibai.gui.SwingListenerDemo

验证下面的输出