1 package runimpl;
 2 public class Machine implements Runnable{
 3   private int a=0;
 4   public void run(){
 5     for(a=0;a<50;a++){
 6       System.out.println(Thread.currentThread().getName()+":"+a);
 7       try{
 8         Thread.sleep(100);
 9       }catch(InterruptedException e){throw new RuntimeException(e);}
10     }
11   }
12   public static void main(String args[]){
13     Machine machine=new Machine();
14     Thread t1=new Thread(machine);
15     Thread t2=new Thread(machine);
16     t1.start();
17     t2.start();
18   }
19 }