Java OCA OCP Practice Question 2747

public class Main implements Runnable {
   static Thread t1;
   static MyClass h, h2;

   public void run() {
      if (Thread.currentThread().getId() == t1.getId())
         h.adjust();//ww w.  jav a  2s.  c o  m
      else
         h2.view();
   }

   public static void main(String[] args) {
      h = new MyClass();
      h2 = new MyClass();
      t1 = new Thread(new Main());
      t1.start();
      new Thread(new Main()).start();
   }
}

class MyClass {
   static int x = 5;

   synchronized void adjust() {
      System.out.print(x-- + " ");
      try {
         Thread.sleep(200);
      } catch (Exception e) {
         ;
      }
      view();
   }

   synchronized void view() {
      try {
         Thread.sleep(200);
      } catch (Exception e) {
         ;
      }
      if (x > 0)
         adjust();
   }
}