Java多线程实现方块赛跑小游戏

import java.awt.*;
import javax.swing.*;
 
public class four3 extends JFrame {
 // 全局变量
 static int positionA = 50, positionB = 50, distanceAll = 1600;
 static int RecWidth = 50, RecHeight = 50;
 static char winner;
 static long sleeptime = 300;
 static boolean waitA = true, waitB = true, gaming = true, unrepaint = true;
 
 //构造函数
 public four3() {
 setTitle("多线程：方块赛跑");
 setBackground(Color.WHITE);
 setSize(1600, 500);
 setLocation(0, 200);
 setResizable(false);
 setVisible(true);
 setDefaultCloseOperation(EXIT_ON_CLOSE);
 }
 
 //绘图函数
 public void paint(Graphics g) {
 // TODO Auto-generated method stub
 g.clearRect(0, 0, 1600, 900);
 g.setColor(Color.RED);
 g.fillRect(positionA - 50, 100, RecWidth, RecHeight);
 g.setColor(Color.BLUE);
 g.fillRect(positionB - 50, 300, RecWidth, RecHeight);
 
 if (!gaming) {
 g.setFont(new Font("宋体", ALLBITS, 50));
 if (winner == 'A') {
 g.setColor(Color.RED);
 g.drawString(new String("Winner Is The Red One!"), 550, 250);
 } else if (winner == 'B') {
 g.setColor(Color.BLUE);
 g.drawString(new String("Winner Is The Blue One!"), 550, 250);
 }
 }
 }
 
 public static void main(String[] args) {
 waitA = false;
 waitB = true;
 unrepaint = false;
 
 threadframe tf = new threadframe();
 threadA tA = new threadA();
 threadB tB = new threadB();
 
 tf.start();
 tA.start();
 tB.start();
 
 try {
 tf.join();
 tA.join();
 tB.join();
 } catch (Exception e) {
 // TODO: handle exception
 }
 return;
 }
 
 
 //红色方块线程
 public static class threadA extends Thread {
 
 public void run() {
 while (gaming) {
 
 while (waitA) {
  if (!gaming)return;
  System.out.print("");
 }
 
 try {
  sleep(sleeptime);
 } catch (InterruptedException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 int distance = (int) (Math.random() * 100000) % 100;
 positionA += distance;
 if (positionA >= distanceAll) {
  positionA = distanceAll;
  unrepaint = false;
  gaming = false;
  winner = 'A';
 }
 unrepaint = false;
 waitA = true;
 waitB = false;
 }
 }
 }
 
 //蓝色方块线程
 public static class threadB extends Thread {
 
 public void run() {
 while (gaming) {
 
 while (waitB) {
  if (!gaming)return;
  System.out.print("");
 }
 
 try {
  sleep(sleeptime);
 } catch (InterruptedException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 int distance = (int) (Math.random() * 100000) % 100;
 positionB += distance;
 
 if (positionB >= distanceAll) {
  positionB = distanceAll;
  unrepaint = false;
  gaming = false;
  winner = 'B';
 }
 unrepaint = false;
 waitB = true;
 waitA = false;
 }
 }
 }
 
 //框架刷新线程
 public static class threadframe extends Thread {
 four3 jiemian = new four3();
 
 public void run() {
 while (gaming) {
 while (unrepaint) {
  if (!gaming)return;
  System.out.print("");
 }
 jiemian.repaint();
 unrepaint = true;
 }
 }
 }
 
}