threaduse.java

多线程是JAVA的难点

public class ThreadUse
{
    static int piao=100;
    public static void main(String [] args)
    {
         Chuangkou c=new Chuangkou(piao);
/*         Thread c1=new Thread(c);
         c1.start();
         Thread c2=new Thread(c);
         c2.start();
         Thread c3=new Thread(c);
         c3.start();
         Thread c4=new Thread(c);
         c4.start();*/
         for(int i=0;i<4;i++)
         {
             new Thread(c).start();
         }
    }
}

class Chuangkou implements Runnable
{
    int piao;
    Chuangkou(int piao)
    {
        this.piao=piao;
    }
    public void run()
    {
       while(true)
       {   
/*         if(piao>0&&piao<=25)
         System.out.println("First Window: "+piao--);
         if(piao==0)
         System.exit(0); 
         if(piao>=26&&piao<=50)
         System.out.println("Second Window: "+piao--); 
         if(piao>=51&&piao<=75)
         System.out.println("Third Window: "+piao--);
         if(piao>=76&&piao<=100)
         System.out.println("Forth Window: "+piao--);*/
         if(piao>0)
         {
               System.out.println(               
                   if(piao>0&&piao<=25)
                   {
                       "First Window: "+piao--;
                   }  
                   if(piao>25&&piao<=50)
                   {
                       "Second Window: "+piao--;
                   }
                   if(piao>50&&piao<=75)
                   {
                       "Third Window: "+piao--;
                   }
                   if(piao>75&&piao<=100)
                   {
                       "Forth Window: "+piao--;
                   } 
               );
         }
         if(piao=0)
         System.exit(0);          
       }
     }  
}