Question

Can you give a java code example of using a singleton pattern and factory pattern design together?

Answer 1

class SingletonFactory {
   // static reference variable
   static SingletonFactory singletonFactory;
//private consutrctor to avoid the creation of objects
   private SingletonFactory() {
   }
   // factory method to return the object
   public static SingletonFactory getInstance() {
       //creating the object only once for the first time
       if (singletonFactory == null)
           singletonFactory = new SingletonFactory();

       return singletonFactory;
   }
}

public class TestSingletonFactory {
   public static void main(String[] args) {
       SingletonFactory s1 = SingletonFactory.getInstance();
       System.out.println(s1);
       SingletonFactory s2 = SingletonFactory.getInstance();
       System.out.println(s2);

   }
}

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