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 /**
  * @param args
  */
 public static void main(String[] args) {
  long time1 = System.currentTimeMillis();
  long time2 = System.currentTimeMillis();
  while (true) {
   while ((time1 - time2) < 30)
    ;
   try {
    Thread.sleep(10);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
 }


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