Tech Kraft

In most cases, instances of objects are created, which result in several objects being created from the same class. Using the Singleton pattern, we can ensure that only a single object of this class is created during the lifetime of the application.

Step 1: Create a Singleton Class

public class SingletonClass
{
      //Create singleton object
      private static SingletonClass singletonInstance = new SingletonClass();
      //Create private constructor so this class cannot be instantiated
      private SingletonClass() {}
      //Get an instance of this class
      public static SingletonClass getInstance() 
     {
          return singletonInstance;
     }
      public void message() {          System.out.println("Singleton Instance");
     }
}

Singleton Demo:

public class SingletonDemo {
     public static void main (String[] args) {
          //The constructor SingleObject() is not available
          //SingletonClass mySingleton= new SingletonClass();

          //Correct Way
          SingletonClass mySingleton= SingletonClass.getInstance();

          //show the message
          mySingleton.showMessage(
     }
}