import java.awt.*;

import java.awt.event.*;

public class TwoListenInner {
private Frame f;

private TextField tf;

public static void main(String args[]) {
TwoListenInner that = new TwoListenInner();
that.go();
}

public void go() {
f = new Frame("Two listeners example");
f.add("North", new Label("Click and drage the mouse"));
tf = new TextField(30);
f.add("South", tf);
f.addMouseMotionListener(new MouseMotionHandler());
f.addMouseMotionListener(new MouseEventHandler());
f.setSize(300, 300);
f.setVisible(true);
}

public class MouseMotionHandler extends MouseMotionAdapter {
public void mouseDragged(MouseEvent e) {
String s = "MouseDragging:X=" + e.getX() + " Y=" + e.getY();
tf.setText(s);
}
}

public class MouseEventHandler extends MouseMotionAdapter {
public void mouseEntered(MouseEvent e) {
String s = "The mouse entered";
tf.setText(s);
}
public void mouseExited(MouseEvent e){
String s="The mouse left the building";
tf.setText(s);}
}

}
我希望达到的效果是：当鼠标进入Frame时文本框提示“The mouse entered”,鼠标在Frame中拖动时显示“MouseDragging:X= Y= ”,鼠标离开时显示“The mouse left the building”.
谁帮我看看是在错在哪里啊？偶是个初学者。。。

程序代码：

import java.awt.*;

import java.awt.event.*;
public class TwoListenInner {
    private Frame f;
    private TextField tf;
    public static void main(String args[]) {
        TwoListenInner that = new TwoListenInner();
        that.go();
    }
    public void go() {
        f = new Frame(\"Two listeners example\");
        f.add(\"North\", new Label(\"Click and drage the mouse\"));
        tf = new TextField(30);
        f.add(\"South\", tf);
        f.addMouseMotionListener(new MouseMotionHandler());
        f.addMouseListener(new MouseEventHandler());
        f.setSize(300, 300);
        f.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
            }
        });
        f.setVisible(true);
    }
    public class MouseMotionHandler extends MouseMotionAdapter {
        public void mouseDragged(MouseEvent e) {
            String s = \"MouseDragging:X=\" + e.getX() + \" Y=\" + e.getY();
            tf.setText(s);
        }
    }
    public class MouseEventHandler extends MouseAdapter {     //注意这儿
        public void mouseEntered(MouseEvent e) {
            String s = \"The mouse entered\";
            tf.setText(s);
        }
        public void mouseExited(MouseEvent e){
        String s=\"The mouse left the building\";
            tf.setText(s);}
    }
    
}

/**
* @(#)MyTest.java
*
*
* @author if
* @version 1.00 2007/3/30
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MyTest extends JPanel implements MouseListener{
private JTextField jtf;

public MyTest(){
jtf=new JTextField(15);
add(jtf);
addMouseListener(this);
}

public void mouseClicked(MouseEvent e){
}

public void mouseEntered(MouseEvent e){
jtf.setText("enter");
}

public void mouseExited(MouseEvent e){
jtf.setText("exit");
}

public void mouseReleased(MouseEvent e){
}

public void mousePressed(MouseEvent e){
}

public static void main(String[] args){
JFrame frame=new JFrame("mouseListener Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new MyTest());
frame.setSize(400,400);
frame.setVisible(true);
}
}

我改了之后还是达不到效果啊

6楼的朋友，我那个例子是书上写的如何使用内部类的一段代码。你写的那个和我想了解的有区别啊

你要了解内部类.也是一样的.
只是将implements MouseListener和其方法实现写在一个内部类里就行.