枚举类型作为类内的嵌套枚举类型

public class Main {
/**来自 
 nowjava**/

  public static void main(String[] args) {

    Person.Gender m = Person.Gender.MALE;

    Person.Gender f = Person.Gender.FEMALE;

    System.out.println(m);

    System.out.println(f);

  }

}


class Person {

  public enum Gender {

    MALE, FEMALE

  }
  /**
  来 自 nowjava - 时  代  Java
  **/

}