get a random enum

random_enum.java

  public static <ENUM_KIND extends Enum<?>> ENUM_KIND rndEnum(final Class<ENUM_KIND> enumType) {
    final ENUM_KIND[] enumValues = enumType.getEnumConstants();
    if (enumValues.length > 0) {
      int rnd = new Random().nextInt(enumValues.length);
      return enumValues[rnd];
    } else {
      // yeah, ok.. nobody knows that kind of exception
      // do something else instead
      throw EnumNotImplementedException.of(enumType);
    }
  }

retrieves any enum

no, sadly it's not possible to get the class of the expected current return-value (stupid java)