public String getNickname() {
    if (nickname != null) {
      return nickname;
    }

    return toString();
  }
Gets the nickname. If this instance has no nickname, this returns the result of calling {@link
#toString}.

@return {@code non-null;} the nickname
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/code/Rop.java