public class VMChecker extends Thread {

  int myCounter = 0 ;
  static int classCounter = 0;
  static boolean preemptive = false;

  public void run() {

    classCounter = myCounter;
    while (myCounter < 2000000) {
      if (classCounter != myCounter) {
        preemptive = true;
        System.out.println("Threads are preemptive\n" +
          "classCounter: " + classCounter + "\n" +
          "myCounter: " + myCounter);
        return;
      } 
      classCounter = ++myCounter;
    }
    if (!preemptive) System.out.println("Threads are cooperative");


  }




}