chromosomes = new HashSet(); population = new ArrayList();
  private void resetCounts() {    numEvals = 0;    numDuplicates = 0;    topDogAge = 0;    startTime = System.currentTimeMillis();    stopTime = startTime + 1000 * ((long) maxTime);    if (reportInterval != 0)      reportTime = startTime + 1000 * ((long) reportInterval);  }