test3.java

这个程序只要用于实现进程(线程)互斥与同步

import java.awt.*;
import java.applet.Applet;
import java.awt.Color;
import javax.swing.JOptionPane;

public class Test3 extends Applet
{
      东西向 td;
      南北向 td2;
      交通信号灯 a=new 交通信号灯();
      
      String xhd="东西灯";
      Graphics g;
      
      String input;
      int time;
      
      int x1=0, x2=0, x3=0;
      int y1=80,y2=80,y3=0;
      
      public void init(){setForeground(Color.DARK_GRAY);}
 
      public void start()
      {
            input=JOptionPane.showInputDialog("请输入红灯须停多少秒？");
            time=Integer.parseInt(input);
            
            if(td==null)td=new 东西向(a);td.start();
            if(td2==null)td2=new 南北向(a);td2.start();
      }
      public void stop(){td=null;td2=null;}
      public void update(Graphics g){paint(g);}
      public void paint(Graphics g){
       g.fillRect(0,100,300,100);
       g.fillRect(100,0,100,300);
       g.setColor(Color.white);
       g.drawString("南北行",100-x2,y2-15);
       g.drawString("南北行",100,y1);
       g.drawString("南北行",160,310-y1);
       g.drawString("南北行",160+x2,325-y2);
       g.drawString("东西行",265-x3,115-y3);
       g.drawString("东西行",265-x1,130);
       g.drawString("东西行",x1,180);
       g.drawString("东西行",x3,195+y3);
       if(xhd=="东西灯")a.切换信号灯(100,85,"红","绿",g);
       if(xhd=="南北灯")a.切换信号灯(100,85,"绿","红",g);
       if(xhd=="黄灯")a.切换信号灯(100,85,"黄","黄",g);
      }
      class 交通信号灯{
            int x,y;
            String 颜色1,颜色2,d;
            
            public void 切换信号灯(int x1,int y1,String c1,String c2,Graphics g)
            {
                  x=x1;y=y1;颜色1=c1;颜色2=c2;
                  
                  int[] sx3={171,177,177,183,177,177,171};
                  int[] sy3={205,205,201,207,213,209,209};
                  int[] sx2={162,168,164,164,160,160,156};
                  int[] sy2={201,207,207,213,213,207,207};
                  int[] nx1={116,122,122,128,128,122,122};
                  int[] ny1={92,86,90,90,94,94,98};
                  int[] nx2={135,139,139,143,137,131,135};
                  int[] ny2={86,86,92,92,98,92,92};
                  
                  int[] wx1={90,94,94,98,92,86,90};
                  int[] wy1={171,171,177,177,183,177,177};
                  int[] wx2={86,92,92,98,92,92,86};
                  int[] wy2={160,160,156,162,168,164,164};
                  int[] ex1={201,207,213,209,209,205,205};
                  int[] ey1={122,116,122,122,128,128,122};
                  int[] ex2={201,207,207,213,213,207,207};
                  int[] ey2={137,131,135,135,139,139,143};
                  
                  
                  if(颜色1=="黄")
                     {
                     	g.setColor(Color.yellow);
                        g.fillPolygon(sx3,sy3,7);
                        g.fillPolygon(sx2,sy2,7);
                        g.fillPolygon(nx1,ny1,7);
                        g.fillPolygon(nx2,ny2,7);
                     }
                  if(颜色1=="红")
                     {
                     	g.setColor(Color.red);
                     	g.fillPolygon(sx3,sy3,7);
                     	g.fillPolygon(sx2,sy2,7);
                     	g.fillPolygon(nx1,ny1,7);
                     	g.fillPolygon(nx2,ny2,7);
                     }              
                  if(颜色1=="绿")
                     {
                     	g.setColor(Color.green);
                     	g.fillPolygon(sx3,sy3,7);
                     	g.fillPolygon(sx2,sy2,7);
                     	g.fillPolygon(nx1,ny1,7);
                     	g.fillPolygon(nx2,ny2,7);
                     }
                  g.fillOval(x,y,15,15);
                  g.fillOval(x+85,y+115,15,15);
                
                  if(颜色2=="黄")
                     {
                     	g.setColor(Color.yellow);
                     	g.fillPolygon(wx1,wy1,7);
                     	g.fillPolygon(wx2,wy2,7);
                     	g.fillPolygon(ex1,ey1,7);
                     	g.fillPolygon(ex2,ey2,7);
                     }
                  if(颜色2=="红")
                     {
                     	g.setColor(Color.red);
                     	g.fillPolygon(wx1,wy1,7);
                     	g.fillPolygon(wx2,wy2,7);
                     	g.fillPolygon(ex1,ey1,7);
                     	g.fillPolygon(ex2,ey2,7);
                     }
                  if(颜色2=="绿")
                     {
                     	g.setColor(Color.green);
                     	g.fillPolygon(wx1,wy1,7);
                     	g.fillPolygon(wx2,wy2,7);
                     	g.fillPolygon(ex1,ey1,7);
                     	g.fillPolygon(ex2,ey2,7);
                     }
                  g.fillOval(x+100,y+15,15,15);
                  g.fillOval(x-15,y+100,15,15);
                  
            }
      }
      class 东西向 extends Thread
      {
            private 交通信号灯 a1;
            public 东西向(交通信号灯 a){a1=a;}
            public void run()
            {
                  for(int j=0;j<100+j;j++)
                  {
                        synchronized(a1){
                         for(int i=0;i<=(time*15);i++)
                         {
                         	   if(x1<100)
                   	            {x1+=5;x3+=5; repaint();}
                   	           else
                   	            {
                   	           	 x1+=5;y3+=3; repaint();
                   	            }
                               if(x1==285)  {x1=0;x3=0;y3=0;}
                               try  {Thread.sleep(50);}
                               catch (InterruptedException e)  {}
                         }
                        
                        xhd="黄灯";
                        repaint();
                        try{Thread.sleep(400);}
                        catch(InterruptedException e){} 
                        
                        xhd="南北灯";x1=50;y3=0;x3=50;repaint();
                        }
                    }
               }
      }
      class 南北向 extends Thread
      {
            private 交通信号灯 a1;
            public 南北向(交通信号灯 a){a1=a;}
            public void run()
            {
             for(int j=0;j<100+j;j++)
              {
                   synchronized(a1)
                   {
                   	for(int i=0;i<(time*15);i++)
                   	 { 
                   	   if(y1<145)
                   	    {y1+=5;y2+=5; repaint();}
                   	   else
                   	   {
                   	   	y1+=5;x2+=3; repaint();
                   	   }
                   	   
                   	   
                   	  
                   	   if(y1==285) {y1=0;x2=0;y2=0;}
                       try{Thread.sleep(50);}
                       catch(InterruptedException e){} 
                      }
                      
                    xhd="黄灯";
                    repaint();
                    try {Thread.sleep(400);}
                    catch(InterruptedException e){}
                    
                    xhd="东西灯";y1=80;x2=0;y2=80;repaint();
                   }
               }
             }
       }
}