public class TThread8 {
   public static void main(String[] args) {
      Adder t = new Adder();
      t.start();
      (new TestSync(t)).start();
      t = null;
   }
}

class Adder extends Thread {
   private int count1 = 0, count2 = 0, count3 = 0;
   private boolean done = false;
   private String[] sym = { "-", "\\", "|", "/" };

   public void run() {
      while (count1 <= 100) {
         synchronized(this) {
            count1++; count2++; count3++;
         }
         System.out.print("\r" + sym[count1 % 4]);
         try {
            Thread.sleep(50);
         } catch (InterruptedException e) {
            System.out.println("Application Interrupted");
         }
      }
      done = true;
   }

   public boolean check() {
      int c1, c2, c3;
      synchronized(this) {
         c1 = count1; c2 = count2; c3 = count3;
      }
      if ((c1 != c2) || (c2 != c3))
         System.out.println("\rNot synced: " + c1 +
                            ", " + c2 + ", " + c3);
      return !done;
   }
}

class TestSync extends Thread {
   private int totAccess = 0;
   private Adder t1 = null;

   public TestSync(Adder t) { t1 = t; }

   public void run() {
      while (t1.check()) ++totAccess;
      System.out.println("\nTotal sync accesses: " + totAccess);
   }
}