/**
     * Returns the total number of times that this sensor has been triggered.
     *
     * @return the total number of times that this sensor has been triggered.
     */

    public long getCount() {

  {- -------------------------------------------
  (1) count フィールドの値をリターンするだけ.
      ---------------------------------------- -}

            synchronized (lock) {
                return count;
            }
        }