import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import javax.swing.JFrame;

/*

 * To change this template, choose Tools | Templates

 * and open the template in the editor.

 */

import javax.swing.JPanel;

import javax.swing.JTextField;

/**

 *

 * @author 李效伦 */

public class HOHO extends JFrame implements KeyListener{

   

    private JTextField t;

    private boolean left = false;

    private boolean right = false;

    private boolean up = false;

    private boolean down = false;

     public HOHO() {

       JPanel p = new JPanel();

       this.add(p);

       p.setLayout(null);

       t = new JTextField();

       t.setEditable(false);

       p.add(t);

       t.setSize(100,30);

       t.setLocation(200,200);

       this.setFocusable(true);

       this.addKeyListener(this);

       this.setSize(480,480);

       this.setVisible(true);

       this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      

     }

    public void keyTyped(KeyEvent e) {

       

    }

    public void keyPressed(KeyEvent e) {

      

       int i = e.getKeyCode();

       switch(i) {

           case  KeyEvent.VK_LEFT :  left=true;  break;

           case  KeyEvent.VK_UP :   up= true;break;

           case  KeyEvent.VK_DOWN :down = true; break;

           case  KeyEvent.VK_RIGHT : right = true;break;

       }

      

       if(up==false&&down==false&&left==false&&right==false) {

         t.setText("什么也没按");

       }

       else if(up==true&&down==false&&left==false&&right==false) {

         t.setText("上");

       }

       else if(up==false&&down==true&left==false&&right==false) {

            t.setText("下");

       }

       else if(up==false&&down==true&left==true&&right==false) {

         t.setText("左下");

       }

       else if(up==true&&down==false&left==false&&right==true) {

         t.setText("右上");

       }

       else if(up==true&&down==false&left==true&&right==false) {

         t.setText("左上");

       }

        else if(up==false&&down==true&left==false&&right==true) {

         t.setText("右下");

       }

       else if(up==false&&down==false&left==true&&right==false) {

            t.setText("左");

       }

       else if(up==false&&down==false&left==false&&right==true) {

            t.setText("右");

       }

      

    }

    public void keyReleased(KeyEvent e) {

      int i = e.getKeyCode();

       switch(i) {

           case  KeyEvent.VK_LEFT :  left=false;  break;

           case  KeyEvent.VK_UP :   up= false;break;

           case  KeyEvent.VK_DOWN :down = false; break;

           case  KeyEvent.VK_RIGHT : right = false;break;

       }

    }

   

    public static void main(String[] args){

     new HOHO();

    }

    

}