gistfile1.txt

import java.util.OptionalLong;

public class TimeStat {
  private long totalTime;
  private long recordCount;
  private long minimumTime;

  public void record(long elapsedTime) {
    totalTime += elapsedTime;
    minimumTime = (recordCount == 0)? elapsedTime: Math.min(minimumTime, elapsedTime);
    recordCount++;
  }

  public double getAverageTime() {
    return ((double)totalTime) / recordCount;
  }
  
  public OptionalLong getMinimumTime() {
    if (recordCount == 0) {
      return OptionalLong.empty();
    }
    return OptionalLong.of(minimumTime);
  }
}