java swing界面模拟交通灯

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本例车到了路口不能转向。
可下载完整版的http://www.crazyit.org/thread-6956-1-2.html
import java.awt.*;  import java.util.*;  import javax.swing.*;  /**  * 2012.4.4  * @author Administrator  * zwyjg@163.com  */  public class Hufan extends JFrame{      public  static HuPanel hp;      public  static Hufan hu;      public static void main(String[] args) {          hu=new Hufan();      }      public Hufan(){          hp=new HuPanel();          this.add(hp);          Thread t=new Thread(new Light());          t.start();          this.setTitle("模拟交通灯");          this.setSize(400, 400);          this.setLocation(300, 200);          this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);          this.setVisible(true);      }  }  class HuPanel extends JPanel implements Runnable{      Vector<Car> arrCar=new Vector<Car>();//放车对象       Vector<Light> arrLight=new Vector<Light>();//放车对象       public HuPanel(){          Thread t=new Thread(this);          t.start();          arrLight.add(new Light(150,150,0));          arrLight.add(new Light(150,215,1));          arrLight.add(new Light(215,235,2));          arrLight.add(new Light(235,150,3));      }      public void paint(Graphics g){          super.paint(g);          g.setColor(Color.darkGray);          g.fillRect(0, 150, 400, 4);          g.fillRect(0, 250, 400, 4);          g.fillRect(150, 0, 4, 400);          g.fillRect(250, 0, 4, 400);          g.setColor(Color.gray);          g.fillRect(0, 200, 400, 2);          g.fillRect(200, 0, 2, 400);          g.setColor(Color.blue);          for(int i=0;i<arrCar.size();i++){//画车               if(arrCar.get(i).direct%2==0){                  g.fillRect(arrCar.get(i).x, arrCar.get(i).y, 20, 35);              }else{                  g.fillRect(arrCar.get(i).x, arrCar.get(i).y, 35, 20);              }          }          for(int i=0;i<arrLight.size();i++){//画灯               Light light=arrLight.get(i);              g.setColor(Color.black);              if(light.direct%2==0){                  g.fillRect(light.x, light.y, 35, 15);              }else{                  g.fillRect(light.x, light.y, 15, 35);              }              g.setColor(Color.green);              if(light.greenLight==true){                  if(light.direct%2==0){                      g.fillOval(light.x, light.y+2, 10, 10);                  }else{                      g.fillOval(light.x+2, light.y, 10   , 10);                  }              }              g.setColor(Color.red);              if(light.redLight==true){                  if(light.direct%2==0){                      g.fillOval(light.x+20, light.y+2, 10, 10);                  }else{                      g.fillOval(light.x+2, light.y+20, 10    , 10);                  }              }          }      }      public synchronized void run() {          Car car=null;          while(true){              Random r=new Random();              int direct=r.nextInt(4);//随机0-3的车的方向               switch(direct){              case 0:                  car = new Car(170, -35, 0);                  arrCar.add(car);                  break;              case 1:                  car = new Car(-35, 220, 1);                  arrCar.add(car);                  break;              case 2:                  car = new Car(220, 355, 2);                  arrCar.add(car);                  break;              case 3:                  car = new Car(355, 170, 3);                  arrCar.add(car);                  break;              }              Thread t = new Thread(car);              t.start();              try {                  Thread.sleep(700);              } catch (InterruptedException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              }          }      }  }  class Car implements Runnable{      int x;//x坐标       int y;//y坐标       int direct;//方向  0:向下 1:向右 2:向上 3:向左       int speed=10;//速度       boolean stopCar=true;//是否停车       boolean stopThread;    public Car(int x,int y,int direct){          this.x=x;          this.y=y;          this.direct=direct;      }      //判断车碰灯，边界       public void panDuan(int x,int y,int direct){          if(x<0||x>400||y<0||y>400){// 碰到边界，从arrAcr删除               Hufan.hp.arrCar.remove(this);             stopThread=true;        }          //是否碰到灯           for(int i=0;i<Hufan.hp.arrLight.size();i++){              Light light=Hufan.hp.arrLight.get(i);              if(direct%2==0){                  if(x>=light.x&&x<=light.x+50&&y>=light.y&&y<=light.y+15){                      if(light.redLight==true&&light.direct==direct){                          stopCar=false;                      }else{                          stopCar=true;                      }                  }              }else{                  if(x>=light.x&&x<=light.x+15&&y>=light.y&&y<=light.y+50){                      if(light.redLight==true&&light.direct==direct){                          stopCar=false;                      }else{                          stopCar=true;                      }                  }              }          }          //车碰车           for(int i=0;i<Hufan.hp.arrCar.size();i++){              Car car=Hufan.hp.arrCar.get(i);              if(direct%2==0){                  if(x>=car.x&&x<=car.x+20&&y>=car.y&&y<=car.y+35){                      if(car.stopCar==false){                          stopCar=false;                      }else{                          stopCar=true;                      }                  }              }else{                  if(x>=car.x&&x<=car.x+35&&y>=car.y&&y<=car.y+20){                      if(car.stopCar==false){                          stopCar=false;                      }else{                          stopCar=true;                      }                  }              }          }      }      public synchronized void run() {          while(true){              switch(direct){              case 0:                  if (stopCar) {                      y += speed;                  }                  this.panDuan(x, y+35, direct);                  break;              case 1:                  if(stopCar){                      x+=speed;                  }                  this.panDuan(x+35, y, direct);                  break;              case 2:                  if(stopCar){                      y-=speed;                  }                  this.panDuan(x, y, direct);                  break;              case 3:                  if(stopCar){                      x-=speed;                  }                  this.panDuan(x, y, direct);                  break;              }              if(stopThread){            break;            }            Hufan.hp.repaint();//刷新JPanel               try {                  Thread.sleep(50);              } catch (InterruptedException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              }          }      }  }  class Light implements Runnable{      int x;//x坐标       int y;//y坐标       boolean redLight;//红灯       boolean greenLight;//绿灯       int direct;//所在方位  0:上 1:左 2:下 3:右       public Light(int x,int y,int direct){          this.x=x;          this.y=y;          this.direct=direct;      }      public Light(){}      public synchronized void run() {          int direct=0;          //判断是否亮灯           while(true){              for(int i=0;i<Hufan.hp.arrLight.size();i++){                  Light light=Hufan.hp.arrLight.get(i);                  if(direct%2==0){                      if(light.direct%2==0){                          light.greenLight=true;                          light.redLight=false;                      }else{                          light.greenLight=false;                          light.redLight=true;                      }                  }else{                      if(light.direct%2==0){                          light.greenLight=false;                          light.redLight=true;                      }else{                          light.greenLight=true;                          light.redLight=false;                      }                  }              }              direct++;              try {                  Thread.sleep(3000);              } catch (InterruptedException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              }          }      }  }