本题的功能是跟踪鼠标在窗口的操作，以及在窗口的坐标，包括移进、移出、移动、单击、释放和拖曳，并将这些信息显示在窗口的文字标签上。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class java3 extends JFrame implements MouseListener MouseMotionListener

private JLabel statusBar;
public java3()

super("java3");
statusBar=new JLabel();
getContentPane.add(statusBar,BorderLayout.SOUTH);
addMouseListener(this);
addMouseMotionListener(this);
setSize(275,100);
show();

public void mouseClicked(MouseEvent e)

statusBar.setText("Clicked at["+e.getX()+","+e.getY()+"]");

public void mousePressed(MouseEvent e)

statusBar.setText("Pressed at["+e.getX()+","+e.getY()+"]");

public void mouseReleased(MouseEvent e)

statusBar.setText("Released at["+e.getX()+","+e.getY()+"]");

public void mouseIn(MouseEvent e)

statusBar.setText("Mouse in window");

public void mouseExited(MouseEvent e)

statusBar.setText("Mouse outside window");

public void mouseDragged(MouseEvent e)

statusBar.setText("Dragged at["+e.getX()+","+e.getY()+"]")

public void mouseMoved(MouseEvent e)

statusBar.setText("Moved at["+e.getX()+","+e.getY()+"]");

public static void main(String args[])

java3 app=new java3();
app.addWindowListener(new WindowAdapter()

public void windowClosing(WindowEvent e)

System.exit(0);

;