uselistenerdemo.java

java2应用开发指南第一版

//UseListenerDemo.java
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class UseListenerDemo extends Applet 
{
    //Applet的初始化方法
    public void init()
    {
        //创建按钮（事件源）
        Button button = new Button("事件源按钮");
        //给按钮添加事件监听器
        button.addMouseListener(new ButtonMouseListener());
        //把按钮加入到Applet容器中
        add(button);
    }
}
//事件监听器类的实现
class ButtonMouseListener implements MouseListener 
{
    //鼠标进入事件
    public void mouseEntered(MouseEvent event) 
    { 
        System.out.println("Mouse Entered Button");
    }
    //鼠标移出事件
    public void mouseExited(MouseEvent event) 
    { 
        System.out.println("Mouse Exited Button");
    }
    //鼠标按下事件
    public void mousePressed (MouseEvent event) { }
    //鼠标单击事件
    public void mouseClicked (MouseEvent event) { }
    //鼠标释放事件
    public void mouseReleased(MouseEvent event) { }
}