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Enum

layout: default title: enum Type

enum is a data type (like class and interface) that allows a variable to be a set of predefined constants.

  • An enum can be in its own .java file, or part of another class.

Use enum types when you need to represent a fixed set of constants, such as: * the names of planets. * a set of command-line flags. * menu options.

Conventions

The name of the type is singular, like creating a class, because callers will use one of the discrete constant values.

public enum Color {
  // ...
}

The members of the enum are constants, so we capitalize and use snake-case.

public enum Color {
  RED, GREEN, BLUE  // comma-separated, no need for a ;
}

Drill

EnumeratedTypes/com.example.enums.drills

  • Create a new enum named Day for the days of the week, starting with Sunday.
  • Be sure to observe naming conventions.

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