构造函数中的Java枚举

Question

i have a class person with a enum Gender and in the Person Constructor i want to initialize the gender and age. How can i instantiate a new Person in main() method?

class Person  {

   public enum Gender { M,F }

   int age;
   Gender gender;

   public Person(int age, Gender gender) {
       this.age=age; this.gender=gender;
   }           
}

public static void main(String[] args) {
    Person p = new Person(20, ?);        
}

Best Regards.

Answer 1

Use

Person p = new Person(20, Person.Gender.M);

Note that a nested enum is accessed like a nested static class.

Answer 2

Person p = new Person(20, Person.Gender.M); works of course.

But it is clumsy enough to prefix the enum by the Person enclosing class at each time you need to specify an enum value.

So add the correct import in the client class. The IDE automatic imports feature should do it for you.

import Person.Gender;

and use a straighter way :

Person p = new Person(20, Gender.M);