Thread Running negative number of time.

Question

Hi All,
I wrote a program to check the effects of Thread priority, however to my surprise the output is weired the higher priority thread shows that it run negative number of time, below is the code.
package javaProg.completeReferance;
class Clicker implements Runnable
     Thread t;
     int click;
     volatile boolean  running = true;
     public Clicker(int pro)
          t=new Thread(this);
          click = 0;
          t.setPriority(pro);
     public void run()
          while (running)
               click++;
     public void start()
          t.start();
     public void stop()
          running=false;
public class TestClicker
     public static void main(String [] args)
          Clicker thread1 = new Clicker(Thread.NORM_PRIORITY+2);
          Clicker thread2= new Clicker(Thread.NORM_PRIORITY-2);
          thread1.start();
          thread2.start();
          System.out.println("Processing");
          try
               Thread.sleep(10000);
          catch (InterruptedException i)
               System.out.println(i);
          thread1.stop();
          thread2.stop();
          try
               thread1.t.join();
               thread2.t.join();
          catch (InterruptedException i)
               System.out.println(i);
          System.out.println("The number of Time Thread1 executed is "+thread1.click);
          System.out.println("The number of time Thread2 executed is "+thread2.click);
}Here is the Output..
C:\Users\pravin>java javaProg.completeReferance.TestClicker
Processing
The number of Time Thread1 executed is -386946835
The number of time Thread2 executed is 837375311Thanks!!

Answer 1

Thanks a lot , I changed int click to long and its
working fine.I am wondering why the Java Platform
didnt throw an error or exception for overflow.Because the Java specification calls for it not to do that but instead to do what you saw and rollover.