ComponentEvent類必須實現(xiàn)這個接口。類的對象組件注冊。使用addComponentListener（）方法，該對象可以被注冊。組件事件提出僅供參考。
接口聲明
以下是聲明的java.awt.event.ComponentListener接口：
public interface ComponentListener
extends EventListener
接口中的方法
|
S.N. |
方法＆說明 |
|
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. |
繼承的方法
這個接口繼承的方法從下面的接口：
ComponentListener示例
選擇使用任何編輯器創(chuàng)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.showComponentListenerDemo();
}
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 showComponentListenerDemo(){
headerLabel.setText("Listener in action: ComponentListener");
ScrollPane panel = new ScrollPane();
panel.setBackground(Color.magenta);
Label msglabel = new Label();
msglabel.setAlignment(Label.CENTER);
msglabel.setText("Welcome to TutorialsPoint AWT Tutorial.");
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() +
