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Java program to create a singleton class with method name as that of class

Learn how to create a singleton class with method name as that of class in Java?
Submitted by Nidhi, on March 20, 2022

Problem statement

In this program, we will create a singleton class with a static method name as that of class. Here this method is not a constructor. It is used to implement a class as a Singleton.

Java program to create a singleton class with method name as that of class

The source code to create a singleton class with method name as that of the class is given below. The given program is compiled and executed successfully.

// Java program to create a singleton class with 
// method name as that of class

class Singleton {
  private static Singleton singleRef = null;

  private Singleton() {}

  public static Singleton Singleton() {
    if (singleRef == null)
      singleRef = new Singleton();

    return singleRef;
  }
}

class Main {
  public static void main(String args[]) {
    Singleton obj1 = Singleton.Singleton();
    Singleton obj2 = Singleton.Singleton();
    Singleton obj3 = Singleton.Singleton();

    if (obj1 == obj2 && obj1 == obj3)
      System.out.println("All object are pointing to the same memory location.");
    else
      System.out.println("All object are not pointing to the same memory location.");
  }
}

Output

All objects are pointing to the same memory location.

Explanation

In the above program, we created a singleton class Singleton and public class Main. The Singleton class contains a static method with a class name that returns the instance of the class.

The Main class contains a static method main(). The main() is an entry point for the program. Here, we created the instances obj1, obj2, obj3 and compared all objects, and printed the appropriate message.

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