How to use enum with grouping and subgrouping hierarchy/nesting

Question

I have one enum \'class\' called Example as follows:

enum Example {
//enums belonging to group A:
   enumA1,
   enumA2,
   enumA3,
//en         


        

Answer 1

Small addition:

I do like both answers from @ELEVATE and @Wendel. And it depends (as always) on the scenario when to use which solution. If each entry must be part of a single group I prefer ELEVATE's solution, because it forces me to add this single group. However if only some enum need to be grouped or they are not distinct I go with Wendel's solution, because it is more flexible (but more error prone)