ss.java

实现两个接力赛跑的一个java applent多线程小程序。

import java.awt.*;
import java.applet.*;
import java.math.*;
public class ss extends Applet implements Runnable
{ int m=150,n=100,x=0,y=70,win=0;
  int x1=200,y1=200;
  int x3=600,y3=350;
  int x2=65,y2=260;
  int x0=715,y0=260;
  double y22;
  Thread t1=null,t2=null,t3=null;
  Font f=new Font("宋体",Font.BOLD,25);
  String str="4991252班 27号 李文义";
  Image img[]=new Image[7];
  Image offimg;
  Graphics offg;//定义Graphics对象，用一实现双缓冲
  public void init()
	{
           //加载图片的初始化
	 for(int i=0;i<7;i++)
	 img[i]=getImage(getDocumentBase(),i+".gif");
	 
 	 offimg=createImage(800,600);
	 offg=offimg.getGraphics();
       }
  public void start()
  {
	if(t1==null)
	{
		t1=new Thread(this);
		t1.start();
	}
	if(t2==null)
	{
		t2=new Thread(this);
		t2.start();
	}
        if(t3==null)
	{
		t3=new Thread(this);
		t3.start();
	}
   }
  public void run()
   {
    while(t1==Thread.currentThread())
     {  
          if(y1<250)
	 {
	x1-=2;
	y1++;}
	if(y1<=340&&y1>=250)
		{
		x1++;
		y1+=2;
		}
	if(y1>=340)
		{x1+=5;}	
	if(x1>=600&&y3>250)
	 {x3++;
	  y3-=2;
	  }
	if(y3<=250&&y3>=200)
	{
	 x3--;
	 y3--;
	}
	if(y3<200) {x3-=8;}
        if(x3<=20){
        win=1;
        t1.stop();
         }
	repaint();
	try{t1.sleep(100);}
	catch(Exception e) {}	
      }
  while(t2==Thread.currentThread())
	{
	 if(x2<600)
	  {
	   if(y2<400)
		{ x2++;
		 y22=Math.sqrt(120*120-(x2-200)*(x2-200))+300;
	 	y2=(int)y22;
		}
	    if(y2>=400)
		{x2+=6;}
	  }
	 else
	   {if(y2>240)
		{
		x2+=2;
	 	 y22=Math.sqrt(100*100-(x2-600)*(x2-600))+300;
	 	y2=(int)y22;
		}
 	   if(y2<=240&&x0>=600)
		{
		 x0-=2;
	 	 y0-=2;
		}
	   }
	if(x0<600)
		{x0-=5;}
	
        if(x0<=20)            
           
        t2.stop();     
	repaint();
	try{t2.sleep(100);}
	catch(Exception e) {}	
	}
   while(t3==Thread.currentThread())
    {         
             if(y<70)
             y+=5;
             else
             y-=5; 

         
              if(n>450)
              x=1;
              if(x==0)
              {
		m++;
		n+=2;
	       }
               else	 
		{
			m-=2;
			n-=2;
		}
               if(n<100)
               x=0;
               if(x0<=20)            
                   t3.stop();
		repaint();
		try{t3.sleep(200);}
		catch(Exception e) {}	
    }
 }
  public void update(Graphics g)
	{
	  offg.setColor(Color.green);
          offg.fillRect(0,0,800,600);
          offg.setColor(Color.red);
          offg.setFont(f);
          offg.drawString(str,m,n); 
	     
          offg.setColor(Color.red);
	  offg.drawLine(60,150,60,250);
	  offg.setColor(Color.blue);
	  offg.drawLine(0,250,600,250);
          offg.drawLine(200,350,600,350);
	  offg.drawArc(150,250,100,100,90,180);
	  offg.drawArc(550,250,100,100,90,-180);
	  
	  offg.drawLine(0,200,600,200);
          offg.drawLine(200,400,600,400);
	  offg.drawArc(100,200,200,200,90,180);
	  offg.drawArc(500,200,200,200,90,-180);

	  offg.drawLine(0,150,600,150);
          offg.drawLine(200,450,600,450);
	  offg.drawArc(50,150,300,300,90,180);
	  offg.drawArc(450,150,300,300,90,-180);
	  
          offg.setColor(Color.red);
	  offg.drawLine(200,250,200,200);
	  offg.drawLine(50,300,100,300);
	  offg.drawLine(600,350,600,400);
	  offg.drawLine(700,300,750,300);
	
	  if(x0<=715)
	    offg.drawImage(img[0],x0,y0,this);
	  if(x1<=600)
	    offg.drawImage(img[1],x1,y1,this);
	  if(y2>=240)
	    offg.drawImage(img[2],x2,y2,this);
	    offg.drawImage(img[3],x3,y3,this);
            offg.drawImage(img[4],250,y,this);
            offg.drawImage(img[5],350,y,this);
            offg.drawImage(img[6],450,y,this);
          if(win==1)
            offg.drawString("我们赢了！",60,240);
          
            offg.setColor(Color.blue);
            offg.setFont( new Font("宋体",Font.BOLD,15));
          {
             offg.drawString("终点",48,145);
            if(y<70)
             {
              offg.drawString("加油！",300,70);
              offg.drawString("快跑！",400,70);
             }
           }

            offg.setColor(Color.black);
            offg.setFont( new Font("宋体",Font.BOLD,30));
          {
              offg.drawString("1",60,180);
              offg.drawString("2",60,240);
              offg.drawString("1",70,300);
              offg.drawString("2",205,240);
          }
	    g.drawImage(offimg,0,0,this);//用offg、offimg实现双缓冲，消除屏幕的闪烁现象
	}
}