Nesting enumerations in Java

I want to nest some enumerations The object I represent is flags, with type and value There are discrete types, each with a different set of possible values

So if type a can have a value of 1,2 or 3 and type B can have a value of 4,5,6, I want to be able to do the following:

Flag f = Flag.A.1;

f.getType() - returns "A"

f.getValue() - returns "1"

Flag f2 = Flag.A.4; -- Syntax error.

I'm frantically trying to nest enums in enums - the possibility I'm trying - do I need to complete enumerations and manually create a static class with static members?

My best efforts so far are:

public class Flag {

    enum A extends Flag {
        ONE("ONE"),TWO("TWO"),THREE("THREE");

        private A(String value) {
            Flag.type = "A";
            Flag.value = value;
        }
    }

        private static String type;
        private static String value;
}

But if I do this:

Flag f = Flag.A.ONE;

Incompatible types

Solution

You cannot have a number as an enumeration It must be an identifier

You can do this

interface Flag {
    String getType();
    int getValue();
    enum A implements Flag{
        one,two,three;
        String getType() { return getClass().getSimpleName(); }
        int getvalue() { return ordinal()+1; }
    }
    enum B implements Flag{
        four,five,six;
        String getType() { return getClass().getSimpleName(); }
        int getvalue() { return ordinal()+4; }
    }
}

Flag f = Flag.A.one;

However, the simpler option may be

enum Flag {
    A1,A2,A3,B4,B5,B6;
    public String getType() { return name().substring(0,1); }
    public int getValue() { return name().charAt(1) - '0'; }
}

Flag f = Flag.A1;