清华大学：JAVA教学课件：7-16

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
// TwoListener类同时实现MouseMotionListener
// 和MouseListener两个接口
public class TwoListener implements MouseMotionListener,MouseListener {
private JFrame frame;
private JTextField tf;
public static void main(String args[]) {
TwoListener two = new TwoListener();
two.go();
}
public void go() {
frame = new JFrame("Two listeners example");
Container contentPane = frame.getContentPane();
contentPane.add(new Label ("Click and drag the mouse"),BorderLayout.NORTH);
tf = new JTextField(30);
contentPane.add(tf,BorderLayout.SOUTH);
// 注册监听程序
frame.addMouseMotionListener(this);
frame.addMouseListener(this);
frame.setSize(300,300);
frame.setVisible(true);
}
//实现 MouseMotionListener接口中的方法
public void mouseDragged (MouseEvent e) {
String s = "Mouse dragging,X = "+ e.getX() + "Y = " + e.getY();
tf.setText(s);
}
public void mouseMoved (MouseEvent e) {}
//实现 MouseListener 接口中的方法
public void mouseClicked (MouseEvent e) {}
public void mouseEntered (MouseEvent e) {
String s = "The mouse entered";
tf.setText(s);
}
public void mouseExited (MouseEvent e) {
String s = "The mouse has left the building";
tf.setText(s);
}
public void mousePressed (MouseEvent e) {}
public void mouseReleased (MouseEvent e) {}
}