// This file defines class "RandomSleep", which provides method "doSleep".

public class RandomSleep {

  // doSleep(lower, upper) executes a sleep command, for period of time that 
  // is randomly chosen from within the range lower, upper].

  public void doSleep(int lower, int upper) {
      if ((lower >=0) && (upper >= lower)) {
          try {
	    java.lang.Thread.sleep((int)(((upper-lower)*Math.random())+lower ));
          } catch(Exception e) {
	                         System.exit(0);
                               }
      }
      else 
          System.out.println("Invalid Parameters to doSleep()");
  }
}