如何访问另一个 class 中的枚举？

Question

I have the following enum:

enum NamesEnum {
    First(1),
    Second(2),
    Third(3),
    Fourth(4),
    static Map<Integer, NamesEnum> valueMap = new HashMap<Integer, NamesEnum();

In another class, I want to access the Fourth using Fourth so that I can get its value of 4 . In the Enum I have get methods for me to access that enum.

Answer 1

If you can declare your enum as public like

public enum NamesEnum {
   //...
}

you can access the contents like

NamesEnum.Fourth

If you want to get the number 4 from NamesEnum.Fourth , you need to expose the stored value somehow. You can do so like this:

public enum NamesEnum {

   First(1),
   Second(2),
   Third(3),
   Fourth(4),

   private final int value;

   NamesEnum(final int Value) {
        value = Value;
   }

   public int getValue() { return value; }
}

and

Names.Fourth.getValue();