实现在窗体内移动鼠标时，能够实时显示鼠标指针的位置

//MyFrame.java

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class MyFrame extends JFrame implements MouseListener {
private JPanel pan;
private JLabel lab;

public MyFrame(String s) {
super(s);
setSize(700, 500);
setLocationRelativeTo(null);

pan = new JPanel();
setContentPane(pan);

lab = new JLabel("");

pan.add(lab);

addMouseListener(this);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public void mouseClicked(MouseEvent e) {
int x = e.getX();
int y = e.getY();
lab.setText("(" + x + "," + y + ")");
}

public void mouseEntered(MouseEvent e) {
int x = e.getX();
int y = e.getY();
lab.setText("(" + x + "," + y + ")");
}

public void mouseExited(MouseEvent e) {
}

public void mouseReleased(MouseEvent e) {
}

public void mousePressed(MouseEvent e) {
}

}

MyFrameDemo.java

public class MyFrameDemo {
public static void main(String[] args) {
MyFrame mf = new MyFrame("鼠标事件演示");
}

}