Create EnumSet in Java - How to Add elements to EnumSet

Published April 04, 2022

The Java.util.EnumSet package is required to create an EnumSet, so you will have to import it first in your Java program. Unlike other set implementations, EnumSet does not have a public constructor, so you must use the predefined methods. These predefined methods include:

allOf (Size)- Using the allof() method, you can create an enum set containing all values of the specified enum type Size.
noneOf(Size)- An empty EnumSet is created with the noneOf() method.
range(e1,e2) Method- Range() creates an enum set which includes both values for an enum between e1 and e2 within a given range.
of() Method- Using the () method, an enum set containing the specified element is created.

The Methods of EnumSet

add(): this method inserts the specified values into the EnumSet
addAll(): this method inserts the specified collections to the set
iterator(): this method is used to access the Enum set elements
hasNext(): this method returns true if there is a next element in the EnumSet
next(): this method returns the next elements in the EnumSet
remove(): this method removes the specified element from the EnumSet
removeAll(): this method removes all elements from the EnumSet

Example of EnumSet

import java.util.EnumSet;

import java.util.Iterator;

public class EnumExample {

enum ES {

a, b, c, d;

}

public static void main(String[] args) {

// Creating EnumSet

EnumSet<ES> sizes = EnumSet.allOf(ES.class);

Iterator<ES> iterate = sizes.iterator();

System.out.print("EnumSet Values: ");

while(iterate.hasNext()) {

System.out.print(iterate.next());

System.out.print(", ");

}

Output:

EnumSet Values: a, b, c, d

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