package  test;

 import  java.util.concurrent.locks.Lock;
 import  java.util.concurrent.locks.ReentrantLock;

 public   class  ConcurentThreadTest  implements  Runnable {
    
    /** Creates a new instance of ConcurentThreadTest */
     public  ConcurentThreadTest() {
    }
    
     synchronized   void  runCounter(){
         int  y;
         try  {
             while (x >  0 ){
                y = x;
                Thread.sleep( 50 );
                System.out.println(Thread.currentThread() + " x=" + y + " x-1=" + --x);                 
            }
        } 
         catch  (InterruptedException ex) {
            ex.printStackTrace();
        }        
    }

     public   void  run() {
         runCounter();
    }
    
     public   static   void  main(String[] args){
        Runnable r1 =  new  ConcurentThreadTest();
        Thread t1 =  new  Thread(r1);
        t1.start();
        
        Runnable r2 =  new  ConcurentThreadTest();
        Thread t2 =  new  Thread(r2);
        t2.start();
            
    }
     static   public   int  x =  10 ;
    //private Lock lock = new ReentrantLock();
}