java游戏-碰到矩形边界时反弹

import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.awt.image.BufferedImage;public class Hufan extends JFrame{static HuPanel hp;static Hufan hu;public static void main(String[] args) {hu=new Hufan();}public Hufan(){hp=new HuPanel();this.addKeyListener(hp);this.add(hp);this.setSize(500, 400);this.setLocation(400, 300);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.setVisible(true);}}class HuPanel extends JPanel implements KeyListener{Rect rect;HuRect huRect;public HuPanel(){rect=new Rect(20,40);huRect=new HuRect(180,290);Thread t=new Thread(rect);t.start();}public void paint(Graphics g){super.paint(g);g.drawRect(0, 0, 400, 300);g.setColor(Color.red);g.fillRect(rect.x, rect.y, 20,20);g.setColor(Color.blue);g.fillRect(huRect.x, huRect.y, 80, 10);}@Overridepublic void keyPressed(KeyEvent e) {switch(e.getKeyCode()){case KeyEvent.VK_LEFT:if(huRect.x>0){huRect.x-=huRect.speed;}break;case KeyEvent.VK_RIGHT:if(huRect.x<320){huRect.x+=huRect.speed;}break;}this.repaint();}public void keyReleased(KeyEvent arg0) {}public void keyTyped(KeyEvent arg0) {}}class Rect implements Runnable{//方块类int x;int y;int speedX=3;//x轴移动速度int speedY=3;//y轴移动速度boolean kaiGuan=true;public Rect(int x,int y){this.x=x;this.y=y;}public void run() {while(this.kaiGuan){x=x+speedX;y=y+speedY;if(x<=0||x>=380){speedX=-speedX;//到达左右边界时，x轴移动速度取反}if(y<=0){speedY=-speedY;//到达左右边界时，y轴移动速度取反}if(y>=280){this.kaiGuan=false;}int xx=Hufan.hp.huRect.x;int yy=Hufan.hp.huRect.y;if(x>=xx&&x<=xx+80&&y+20>=yy&&y+20<=yy+10){//方块与矩形相碰检测speedY=-speedY;}try {Thread.sleep(30);} catch (InterruptedException e) {e.printStackTrace();}Hufan.hu.hp.repaint();}}}class HuRect extends Rect{//下面的矩形类int speed=5;public HuRect(int x, int y) {super(x, y);}}