Hi @#-Link-Snipped-#
We take it that you are new to java programming. But you can find the answers to these questions in reference books.
Answering your query, the reason behind enum's non-ability to be declared inside a method is that enums are always static entities. What this means is that you must be able to access an enum from anywhere in your code, without involving the invocation of any code block (such as a method.)
Isn't that the whole purpose behind declaring the cute enum keyword? 😀

If an enum is defined inside a class, it becomes a static member of the class, and you can access it like any static member of the class such as static member classes of the class, as long as the class is accessible from your code.
If enums were defined inside methods, then they wouldn't be static anymore. You would actually need to invoke the method in order to instantiate the enum.

You should also keep in mind that - You can mark an enum which is declared inside a class as private or protected, so you must observe the access restrictions like for any other class member.