Creational Design Pattern : Abstract Factory

Abstract Factory is a creational design pattern and it provides one level of interface higher than the Factory design pattern.

Problem:

To create complex objects, we use the factory method but it provides same class object for that method.

Solution:

We provide one extra interface to switch the factory.

Implementation:

Button.java:

public interface Button {

      public void click();

}

Xbutton.java:

public class XButton implements Button {

      @Override

      public void click() {

            System.out.println("XButton is clicked.");

      }

}

Ybutton.java:

public class YButton implements Button {

      @Override

      public void click() {

            System.out.println("YButton is clicked.");

      }

}

ButtonFactory.java:

public interface ButtonFactory {

      public Button createButton();

}

XButtonFactory.java:

public class XButtonFactory implements ButtonFactory {

      @Override

      public Button createButton() {     

            return new XButton();

      }

}

YButtonFactory.java:

public class YButtonFactory implements ButtonFactory{

      @Override

      public Button createButton() {

            return new YButton();

      }

}

Test.java:

public class Test {

      public static void main(String[] args) {

        ButtonFactory factory = new XButtonFactory();

        Button button = factory.createButton();

        button.click();

        factory = new YButtonFactory();

        button = factory.createButton();

        button.click();

    }

}