How does the compiler know to implement compareTo() ?

  @Override
  public int compareTo(Object obj) {
    //First compare the tweets themselves. If at this top stage, they are indeed the same object, stop and return 0.
    Treet other = (Treet) obj;
    if (equals(other)) {
      return 0;
    }

    //It didn't pass the first test, so we compare by dates. Same dates (time stamp) are usually same tweet.
    int dateCmp = mCreationDate.compareTo(other.mCreationDate);
    if (dateCmp == 0) {
    return mDescription.compareTo(other.mDescription);
    }

    //if not, then show how much older, more recent the 'other' tweet is.

    return dateCmp;

  }

'''