question in designing a class in java

Question

I have a Employee class and department class.Now within employee i have a department as its member.The department can be either of 2 type "HR" or "Admin".Now should i declare departmentype as a enum in a separate interface and then should model department class as show below?

public interface Myconstants{

  enum Depttype{HR,Admin};

}

public class Department{

 Myconstants.Depttype depttype;
 Department(Myconstants.Depttype depttype){
   this.deptype = deptype;
}

Answer 1

I would simply declare the enum on the Department class.

public class Department {

  public enum Depttype{HR,Admin};

  private Depttype depttype;

  Department(Depttype depttype) {
   this.deptype = deptype;
  }
}

Answer 2

As written, why not just declare an enum?

You're declaring an enum and then wrapping it in a class, for no clear benefit.

Answer 3

I don't see why the enum should be part of an interface. If the "Department type" as you intend it is supposed to be a caracterization of your "Departments", then the proper way seems to declare the enum as attribute of the Department class.

Answer 4

We declare enums separately, as straightforward enums in their own constants directory. Departmenttype could in the future be used elsewhere in the app ? And keeping all the constants/enums in the same place makes it easy for the developers.