程序代码：

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class MouseEventTest extends JFrame{
    private Container container;
    private JLabel label;
    private JPanel panel;
    
    public MouseEventTest(){
        super("鼠标事件一");
        container = getContentPane();
        label = new JLabel("显示坐标");
        panel = new JPanel();
        addMouseMotionListener(
                new MouseAdapter(){
                    public void mouseMoved(MouseEvent event){
                        label.setText(event.getX() + ":" + event.getY());
                    }
                }
                );
        container.add(panel);
        container.add(label,BorderLayout.SOUTH);
        
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400,400);
        
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension frameSize = getSize();
        setLocation((screenSize.width - frameSize.width)/2,(screenSize.height - frameSize.height)/2);
        setVisible(true);
    }
    
    public static void main(String[] args) {
        new MouseEventTest();
    }
}