Effective Java Chapter 6 34-35

Chapter 6. ENUM and Annotations

34. Use enums instead of int constants

When should I use an enum? → Whenever you need a set of constants that are revealed at compile time!
The constant-specific method was unfamiliar and didn't fit. .. The following explanation was easy to understand.

http://d.hatena.ne.jp/hageyahhoo/20091115/1258258461

35. Use instance field values rather than ordinal

In the first place, the ordinal method is used for EnumSet and EnumMap, and most programmers do not use it.

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