编程目的：  实现在窗口中放置按钮，选中按钮，然后利用键盘上的方向键移动该按钮，当放开方向键时，在文本框中显示按钮左上角的图标

出现的问题：选中按钮后按方向键，按钮不会移动




package shijian;
import javax.swing.*;
import java.awt.event.*;
public class Sj11 extends JFrame
{
    int x,y;
    JButton bt=new JButton("移动我");
    JTextField tf=new JTextField(50);
    public Sj11(String s)
    {
        super(s);
        setLayout(null);
        setBounds(100,100,300,300);
        bt.setBounds(30, 30, 80, 20);
        bt.addKeyListener(new MyKey());
        tf.setBounds(60, 200, 170, 20);
        add(bt);
        add(tf);
        setVisible(true);
        setResizable(false);
        
    }
    public static void main(String[] args)
    {
        Sj11 frm=new Sj11("键盘事件");
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    class MyKey extends KeyAdapter
    {
        public void KeyPressed(KeyEvent e)
        {
            JButton but=(JButton)e.getSource();
            x=but.getLocation().x;
            y=but.getLocation().y;
            if(e.getKeyCode()==KeyEvent.VK_UP)
            {
                y=y-2;
                if(y<=0) y=0;
            }
            else if(e.getKeyCode()==KeyEvent.VK_DOWN)
            {
                y=y+2;
                if(y>=240) y=240;
            }
            else if(e.getKeyCode()==KeyEvent.VK_LEFT)
            {
                x=x-2;
                if(x<=0) x=0;
            }
            else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
            {
                x=x+2;
                if(x>=200) x=200;
            }
            but.setLocation(x,y);
        }
        public void KeyReleased(KeyEvent e)
        {
            String str="按钮左上角现在的位置是("+x+","+y+")";
            tf.setText(str);
        }
    }

}

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package test;

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

public class Test {

   
public static class Sj11 extends JFrame
{
    int x,y;
    JButton bt=new JButton("移动我");
    public static JTextField tf=new JTextField(50);
    public Sj11(String s)
    {
        super(s);
        setLayout(null);
        setBounds(100,100,300,300);
        bt.setBounds(30, 30, 80, 20);
        //bt.addKeyListener(new MyKey());
        tf.setBounds(60, 200, 170, 20);
        add(bt);
        add(tf);
        setVisible(true);
        setResizable(false);
        //这里是listener 我重新写的  你之前的方式不怎么对
        bt.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyPressed(java.awt.event.KeyEvent evt) {
                btKeyPressed(evt);
               
            }
            public void keyReleased(java.awt.event.KeyEvent evt) {
                btKeyReleased(evt);
            }
            
           
        });
      
    }
   
     private void btKeyPressed(KeyEvent e) {
                JButton but=(JButton)e.getSource();
            x=but.getLocation().x;
            y=but.getLocation().y;
            if(e.getKeyCode()==KeyEvent.VK_UP)
            {
                y=y-2;
                if(y<=0) y=0;
            }
            else if(e.getKeyCode()==KeyEvent.VK_DOWN)
            {
                y=y+2;
                if(y>=240) y=240;
            }
            else if(e.getKeyCode()==KeyEvent.VK_LEFT)
            {
                x=x-2;
                if(x<=0) x=0;
            }
            else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
            {
                x=x+2;
                if(x>=200) x=200;
            }
            but.setLocation(x,y);
            //    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }
            
            public void btKeyReleased(KeyEvent e)
        {
            String str="按钮左上角现在的位置是("+x+","+y+")";
            tf.setText(str);
            
        }

}
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
         Sj11 frm=new Sj11("键盘事件");
         
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
    }
   
}
这样子可以用了 ！！

好  谢啦