/* * ͨ¹ý¼üÅÌ¿ØÖÆСÇòÒƶ¯ */ package com.bj.event; import java.awt.*; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.*; public class BallRolling extends JFrame{ MyPanel mp=null; public static void main(String[] args) { // TODO Auto-generated method stub BallRolling br=new BallRolling(); } public BallRolling(){ mp=new MyPanel(); this.add(mp); this.addKeyListener(mp); this.setSize(200,200); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); } } //¶¨Òå×Ô¼ºÃæ°å class MyPanel extends JPanel implements KeyListener{ int x=10; int y=10; public void paint (Graphics g){ super.paint(g); g.fillOval(x, y, 20, 20); } //¾ßÌå°´ÏÂijһ¸ö¼ü @Override public void keyTyped(KeyEvent e) { // TODO Auto-generated method stub System.out.println("KeyType"); } //¼ü°´Ï @Override public void keyPressed(KeyEvent e) { // TODO Auto-generated method stub //System.out.println("KeyPressed"+(char)e.getKeyCode()); if(e.getKeyCode()==KeyEvent.VK_DOWN){ //System.out.println("12"); this.y+=10; }else if(e.getKeyCode()==KeyEvent.VK_UP){ this.y-=10; }else if(e.getKeyCode()==KeyEvent.VK_LEFT){ this.x-=10; }else if(e.getKeyCode()==KeyEvent.VK_RIGHT){ this.x+=10; } //µ÷ÓÃÖػ溯Êýrepaint this.repaint(); } //¼üËÉ¿ª @Override public void keyReleased(KeyEvent e) { // TODO Auto-generated method stub System.out.println("KeyReleased"); } }