请问repaint();刷新频率太低,怎么能提高频率让屏幕不再闪烁? - 黑马程序员技术交流社区

自己参考书上仿照着写的双人赛车游戏,刷新频率实在是太低了,屏幕闪烁的晃眼,求助怎么解决重绘游戏屏幕是闪烁的问题?
package S1P9;
//导入所需要的软件包
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
//创建的类S1P9继承于JFrame
public class S1P9 extends JFrame {
/**
* @param args
*/
//通过调用构造方法运行该程序
public static void main(String[] args) {
// TODO Auto-generated method stub
new S1P9();
}
//设置游戏屏幕大小
final int WIDTH = 900, HEIGHT = 650;
double p1Speed=.5,p2Speed=.5;
Rectangle p1=new Rectangle(WIDTH/9,HEIGHT/2,WIDTH/30,WIDTH/30);
//下面的矩形代表第二辆赛车
Rectangle p2=new Rectangle(((WIDTH/9)+(int)(((WIDTH/9)*1.5)/2)),(HEIGHT/2)+(HEIGHT/10),WIDTH/30,WIDTH/30);
/*下面是待绘制的矩形*/
/*
*创建矩形的代码起初看起来有点复杂，但是各个矩形的创建大同小异，它们的大小都是取决于WIDTH和HEIGHT的属性值
*/
//下面的矩形分别表示赛场的左右上下部分，以及赛场中央区域
Rectangle left=new Rectangle(0,0,WIDTH/9,HEIGHT);
Rectangle right=new Rectangle((WIDTH/9)*9,0,WIDTH/9,HEIGHT);
Rectangle top=new Rectangle(0,0,WIDTH,HEIGHT/9);
Rectangle bottom=new Rectangle(0,HEIGHT/9*9,(WIDTH/9)*10,HEIGHT/9);
Rectangle center = new Rectangle((int)((WIDTH/9)*2.5),(int)((HEIGHT/9)*2.5),(int)((WIDTH/9)*5),(int)((HEIGHT/9)*4));
//下面的矩形用于绘制跑道上的障碍物，以增加赛车的难度
Rectangle obstacle=new Rectangle(WIDTH/2,(int)((HEIGHT/9)*7),WIDTH/10,HEIGHT/9);
Rectangle obstacle2=new Rectangle(WIDTH/3,(int)((HEIGHT/9)*5),WIDTH/10,HEIGHT/4);
Rectangle obstacle3=new Rectangle(2*(WIDTH/3),(int)((HEIGHT/9)*5),WIDTH/10,HEIGHT/4);
Rectangle obstacle4=new Rectangle(WIDTH/3,HEIGHT/9,WIDTH/30,HEIGHT/9);
Rectangle obstacle5=new Rectangle(WIDTH/2,(int)((HEIGHT/9*1.5)),WIDTH/30,HEIGHT/4);
//下面的矩形用于绘制内外跑道的终点线
Rectangle finish=new Rectangle(WIDTH/9,(HEIGHT/2)-(HEIGHT/9),(int)((WIDTH/9)*1.5),(HEIGHT/70));
//下面的矩形用于绘制外跑道的起跑线
Rectangle line0=new Rectangle(WIDTH/9,HEIGHT/2,(int)((WIDTH/9)*1.5)/2,HEIGHT/140);
//下面的矩形用于绘制内跑道的起跑线
Rectangle line1=new Rectangle(((WIDTH/9)+((int)((WIDTH/9)*1.5)/2)),(HEIGHT/2)+(HEIGHT/10),(int)((WIDTH/9)*1.5)/2,HEIGHT/140);
//构造方法
public S1P9(){
//使用下列代码设置JFrame
super("Radical Racing");
setSize(WIDTH/9*10,HEIGHT/9*10);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
Move1 m1=new Move1();
Move2 m2=new Move2();
m1.start();
m2.start();
}
private class Move1 extends Thread{
public void run(){
//通过永久循环语句让赛车1不断向前行驶
while(true){
//用try...catch语句捕捉异常，如果运行出错，退出循环
try{
//刷新游戏屏幕
repaint(0);
//赛车行驶中加速
if(p1Speed<=5){
p1Speed+=.2;
}
p1.y-=p1Speed;
//设置每次加速的间隔时间
Thread.sleep(75);
}catch(Exception e){
//如果程序运行出错，那么退出循环
break;
}
}
}
}
private class Move2 extends Thread{
public void run(){
//通过永久循环语句让赛车2不断向前行驶
while(true){
//用try...catch语句捕捉异常，如果运行出错，退出循环
try{
//刷新游戏屏幕
repaint(0);
//赛车行驶中加速
if(p2Speed<=5){
p2Speed+=.2;
}
p2.y-=p2Speed;
//设置每次加速的间隔时间
Thread.sleep(75);
}catch(Exception e){
//如果程序运行出错，那么退出循环
break;
}
}
}
}
//该方法用于绘制赛车和赛场
public void paint(Graphics g){
super.paint(g);
//绘制赛场背景
g.setColor(Color.DARK_GRAY);
g.fillRect(0, 0, WIDTH, HEIGHT);
//绘制时，先将场地设置为绿色
g.setColor(Color.GREEN);
//现在绘制各个矩形
g.fillRect(left.x, left.y, left.width, left.height);
g.fillRect(right.x, right.y, right.width, right.height);
g.fillRect(top.x, top.y, top.width, top.height);
g.fillRect(bottom.x, bottom.y, bottom.width, bottom.height);
g.fillRect(center.x, center.y, center.width, center.height);
g.fillRect(obstacle.x, obstacle.y, obstacle.width, obstacle.height);
g.fillRect(obstacle2.x, obstacle2.y, obstacle2.width, obstacle2.height);
g.fillRect(obstacle3.x, obstacle3.y, obstacle3.width, obstacle3.height);
g.fillRect(obstacle4.x, obstacle4.y, obstacle4.width, obstacle4.height);
g.fillRect(obstacle5.x, obstacle5.y, obstacle5.width, obstacle5.height);
//设置起跑线为白色
g.setColor(Color.WHITE);
//绘制起跑线
g.fillRect(line0.x, line0.y, line0.width, line0.height);
g.fillRect(line1.x, line1.y, line1.width, line1.height);
//设置终点线为黄色
g.setColor(Color.YELLOW);
//绘制终点线
g.fillRect(finish.x, finish.y, finish.width, finish.height);
g.setColor(Color.RED);
//绘制赛车1
g.fill3DRect(p1.x, p1.y, p1.width, p1.height,true);
//设置赛车2为黑色
g.setColor(Color.BLACK);
//绘制赛车2
g.fill3DRect(p2.x, p2.y, p2.width, p2.height, true);
}
}
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