Enumeration Fundamentals : enum « Data Type « Java Tutorial

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Java Tutorial » Data Type » enum 
2. 43. 1. Enumeration Fundamentals

An enumeration is created using the new enum keyword.

enum Week {
  Monday, Tuesday, Wednesday, Thursday, Friday, Saturaday, Sunday
}
  1. The identifiers Monday, Tuesday, and so on, are called enumeration constants.
  2. Each is implicitly declared as a public, static member of Week.
  3. Their type is the type of the enumeration in which they are declared.
  4. These constants are called self-typed.

You declare and use an enumeration variable in much the same way as the primitive types.

Week aWeekDay;

Because aWeekDay is of type Week, the only values that it can be assigned (or contain) are those defined by the enumeration.

enum Week {
  Monday, Tuesday, Wednesday, Thursday, Friday, Saturaday, Sunday
}

public class MainClass {
  public static void main(String args[]) {
    Week aWeekDay;

    aWeekDay = Week.Monday;

    // Output an enum value.
    System.out.println("Value of aWeekDay: " + aWeekDay);
    System.out.println();
  }
}
Value of aWeekDay: Monday
2. 43. enum
2. 43. 1. Enumeration Fundamentals
2. 43. 2. How to define an enumeration
2. 43. 3. Enums in a Class
2. 43. 4. equals and = operator for enum data type
2. 43. 5. Comparing Enumeration Values
2. 43. 6. Two enumeration constants can be compared for equality by using the == relational operator
2. 43. 7. uses an enum, rather than interface variables, to represent the answers.
2. 43. 8. enum type with its own method
2. 43. 9. Enum type field
2. 43. 10. enum with switch
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