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What are enumerations in Java? How to retrieve values from an enum?
Enumeration (enum) in Java is a datatype which stores a set of constant values. You can use enumerations to store fixed values such as days in a week, months in a year etc.
You can define an enumeration using the keyword enum followed by the name of the enumeration as −
enum Days {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}Just like arrays, the elements/constants in an enumeration are identified using numbers starting from 0 in the above example the days are identified using numbers as shown in the following illustration −
Retrieving values from an enum
You can retrieve all the elements of an enum using the values() method.
Example
enum Days {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}
public class EnumerationExample {
public static void main(String args[]) {
Days constants[] = Days.values();
System.out.println("Value of constants: ");
for(Days d: constants) {
System.out.println(d);
}
}
}Output
Value of constants: SUNDAY MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY SATURDAY
Updated on: 30-Jul-2019
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