Hierarchical enum in Java

Let's say I have a structure like this:

Is it possible to create an enum that will return the string value of selected cell? For example:

enum.GROUP_MAIN1.SUBGROUP1.COL1

will return value "COL1".

I was looking for nested enums but didn't find the solution to this situation.

You can do this with such trick:

public interface GROUPMAIN1 {
    enum SUBGROUP1 implements GROUPMAIN1 {
        COL1,
        COL2
    }
    enum SUBGROUP2 implements GROUPMAIN1 {
        COL3,
        COL4
    }
}

So to get enum you will need to use GROUPMAIN1.SUBGROUP1.COL1.

It can also be done in another way if all you need is just a string constants:

public interface GROUPMAIN1 {
    interface SUBGROUP1 {
        String COL1 = "COL1";
        String COL2 = "COL2";
    }
    interface SUBGROUP2 {
        String COL3 = "COL3";
        String COL4 = "COL4";
    }
}