Singleton Design Pattern

There must be only one instance of the class.

A class must have single instance.

Simple implementation

The very basic implementation of Singleton Design Pattern should provide

• Global point of access

• Global method to create the instance

Singleton.java

public class Singleton{
    public static Singleton INSTANCE;
    
     private Singleton(){
     }
     
      public static Singleton getInstance(){
          if(INSTANCE == null){
              INSTANCE = new Singleton();
          }
          return INSTANCE;
      } 
}