code: String showDetail() {
          if (isDefault() || isEmpty()) {
              return "";
          } else {
              return entries.stream()
                      .map(sue -> "---- " + sue.name
                              + (sue.timeStamp.isEmpty()
                                      ? ""
                                      : " @ " + sue.timeStamp)
                              + " ----\n" + sue.content)
                      .collect(joining());
          }
      }
docs: show corresponding contents for show()