EnumSet

EnumSet Methods

Here is a java program to show how all these Enum methods work:

import java.util.*;
public class Main {
    enum faces {
        happy,
        sad,
        angry,
        tired,
        confused
    }
    public static void main(String[] args) {
        // creating a new enumSet using allOf()
        EnumSet < faces > a = EnumSet.allOf(faces.class);
        System.out.println("EnumSet: " + a);

        //creating an empty enumSet using noneOf()
        EnumSet < faces > n = EnumSet.noneOf(faces.class);
        System.out.println("Empty EnumSet: " + n);

        //creating an enumSet using the range()
        EnumSet < faces > r = EnumSet.range(faces.sad, faces.tired);
        System.out.println("Values from Sad to tired: " + r);

        //creating an enumSet having only specific elements using of()
        EnumSet < faces > o = EnumSet.of(faces.happy, faces.angry);
        System.out.println("EnumSet having only happy and angry: " + o);

        //creating an EnumSet having all the enum values
        EnumSet < faces > s1 = EnumSet.allOf(faces.class);

        //creating an empty EnumSet
        EnumSet < faces > n1 = EnumSet.noneOf(faces.class);

        //adding sad value in the empty EnumSet (n1) using add()
        n1.add(faces.sad);
        System.out.println("Empty EnumSet after adding a value: " + n1);

        //adding all values from s1 to the empty EnumSet (n1) using addAll()
        n1.addAll(s1);
        System.out.println("Empty EnumSet after adding all the values of other set: " + n1);

        //Iterating the elements
        System.out.println("Iterating the elements of the EnumSet");
        EnumSet < faces > i = EnumSet.allOf(faces.class);
        Iterator < faces > it = i.iterator();
        
        while (it.hasNext()) {
            System.out.println(it.next() + ", ");
        }

        //removing specific values from the enumSet using remove()
        boolean re = i.remove(faces.angry);
        System.out.println("Is the specific value removed?: " + re);

        //removing all the values from the enumSet using removeAll()
        boolean re1 = i.removeAll(i);
        System.out.println("All the values removed?: " + re1);
    }
}

You can also try this code with Online Java Compiler

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Output:

EnumSet: [happy, sad, angry, tired, confused]
Empty EnumSet: []
Values from Sad to tired: [sad, angry, tired]
EnumSet having only happy and angry: [happy, angry]
Empty EnumSet after adding a value: [sad]
Empty EnumSet after adding all the values of other set: [happy, sad, angry, tired, confused]
Iterating the elements of the EnumSet
happy, 
sad, 
angry, 
tired, 
confused, 
Is the specific value removed?: true
All the values removed?: true

You can also try this code with Online Java Compiler

Run Code

Practice it on online java compiler for better understanding.

Frequently Asked Questions

Is the EnumSet synchronized?

Due to its high-performance nature, EnumSet is faster than HashSet because it is not synchronized.
 

Is EnumSets clonable and serializable?

The EnumSet class implements cloneable and Serializable interfaces. Cloneable allows EnumSet to make copies of its instances. Java objects must be serialized if they are transmitted over a network. Java objects are not capable of being transmitted over the Internet.
 

How many parameters can the of() method contain?

The of() method accepts up to 5 parameters, such as:
of(e1, e2, e3)
of(e1, e2, e3, e4)
of(e1, e2, e3, e4, e5)

Conclusion

In this blog, we have seen what is EnumSet in the Collection Framework and also the implementation and methods of EnumSet.

We hope that this blog has helped you enhance your knowledge about EnumSet and if you would like to learn more, check out our articles on the link. Do upvote our blog to help other ninjas grow. Happy Coding!