How to make a singleton enum in Java?

The singleton pattern restricts the instantiation of a class to one object. INSTANCE is a public static final field that represents the enum instance. We can get the instance of the class with the EnumSingleton.INSTANCE but it is better to encapsulate it in a getter in case if we want to change the implementation.

There are a few reasons why we can use an enum as a singleton in Java.

  • Guaranteed one instance (Cannot instantiate more than one enum even through reflection).

  • Thread-safe.

  • Serialization.


public enum Singleton {
   private singleton() {


public enum EnumSingleton {
   private String name;
   private int age;
   private void build(SingletonBuilder builder) { =;
      this.age = builder.age;
   public static EnumSingleton getSingleton() { // static getter
      return INSTANCE;
   public void print() {
      System.out.println("Name: "+name + ", age: "+age);
   public static class SingletonBuilder {
      private final String name;
      private int age;
      private SingletonBuilder() {
         name = null;
      public SingletonBuilder(String name) { = name;
      public SingletonBuilder age(int age) {
         this.age = age;
         return this;
      public void build() {;
   public static void main(String[] args) {
      new SingletonBuilder("Adithya").age(25).build();


Name: Adithya, age: 25

Updated on: 22-Nov-2023

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