Factory design pattern

Factory design pattern

Factories are used to return a certain type of objects based on the arguments provided to it.

It makes sense of using a singleton design pattern for the factories otherwise multiple clients will have their own versions of the factories.

public interface I_Animal {

     

      public void makeSound();

}

public class Cat implements I_Animal {

      @Override

      public void makeSound() {

            System.out.println("Meaow");

      }

}

public class Dog implements I_Animal {

      @Override

      public void makeSound() {

            System.out.println("Bark");

      }

}

public class Factory {

     

      private static final Factory instance = new Factory();

     

      private Factory() {

            super();

      }

      public static Factory getInstance() {

            return instance;

      }

     

      public I_Animal getAnimal(String name) {

            if(name.equals("cat")) {

                  return new Cat();

            } else {

                  return new Dog();

            }

      }

}

public class MainClass {

     

      public static void main(String[] args) {

            I_Animal animal1 = Factory.getInstance().getAnimal("cat");

            animal1.makeSound();

            I_Animal animal2 = Factory.getInstance().getAnimal("dog");

            animal2.makeSound();

      }

}


Code link : https://github.com/sksumit1/DesignPatterns