Android™ How to Program, Second Edition

F.8. Enumerations

In Fig. D.5, we introduced the basic enum type, which defines a set of constants represented as unique identifiers. In that program the enum constants represented the game’s status. In this section we discuss the relationship between enum types and classes. Like classes, all enum types are reference types. An enum type is declared with an enum declaration, which is a comma-separated list of enum constants—the declaration may optionally include other components of traditional classes, such as constructors, fields and methods. Each enum declaration declares an enum class with the following restrictions:

1. enum constants are implicitly final, because they declare constants that shouldn’t be modified.

2. enum constants are implicitly ...