java --thread--火车票售票系统

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public class testTickts {

public static void main(String [] args)
{
  tickts mt = new tickts();
  new Thread(mt).start();
  try
  {
   Thread.sleep(1000);
  }
  catch(Exception e)
  {

  }


  mt.b=true;
  new Thread(mt).start();
// new Thread(mt).start();
// new Thread(mt).start();
}
}

class tickts implements Runnable
{
int ticks =100;
Object obj =new Object();
boolean b =false;
public void run()
{
  while(true)
  {
   if(b==false)
   {
    while(true)

    sell();
   }
   else
   {


    synchronized (this) {


     if (ticks > 0) {
      try {
       Thread.sleep(10);
      } catch (Exception e) {

      }
      System.out.println("obg+"+Thread.currentThread().getName()
        + "sells ticks: " + ticks);
      ticks--;
     }
    }

   }
  }
  }

public synchronized void sell()
{
  if (ticks > 0) {
   try {
    Thread.sleep(10);
   } catch (Exception e) {

   }
   System.out.println("this"+ Thread.currentThread().getName()
     + "sells ticks: " + ticks);
   ticks--;
  }
}
}