Abstract Factory پترن در جاوا (دیزاین پترن در جاوا)

public interface Shape {
     void draw();
}
public class Square implements Shape {

     @Override
     public void draw() {
          System.out.println("Inside Square::draw() method.");

     }

}
public class Rectangle implements Shape {

     @Override
     public void draw() {
          System.out.println("Inside Rectangle::draw() method.");

     }

}
public class Circle implements Shape {

     @Override
     public void draw() {
          System.out.println("Inside Circle::draw() method.");

     }

}
public interface Color {
     void fill();
}
public class Blue implements Color {

     @Override
     public void fill() {
          System.out.println("Inside Blue::fill() method.");

     }

}

public class Green implements Color {

     @Override
     public void fill() {
          System.out.println("Inside Green::fill() method.");

     }

}
public class Red implements Color {

     @Override
     public void fill() {
          System.out.println("Inside Red::fill() method.");

     }

}

public class ShapeFactory extends AbstractFactory {

     @Override
     Color getColor(String color) {
          return null;
     }

     @Override
     Shape getShape(String shape) {
         if(shape == null){
              return null;
           }      

           if(shape.equalsIgnoreCase("CIRCLE")){
              return new Circle();

           }else if(shape.equalsIgnoreCase("RECTANGLE")){
              return new Rectangle();

           }else if(shape.equalsIgnoreCase("SQUARE")){
              return new Square();
           }

           return null;
     }

}

public class ColorFactory extends AbstractFactory {

     @Override
     Color getColor(String color) {
          if (color == null) {
              return null;
          }

          if (color.equalsIgnoreCase("RED")) {
              return new Red();

          } else if (color.equalsIgnoreCase("GREEN")) {
              return new Green();

          } else if (color.equalsIgnoreCase("BLUE")) {
              return new Blue();
          }

          return null;
     }

     @Override
     Shape getShape(String shape) {
          return null;
     }

}

public abstract class AbstractFactory {
     abstract Color getColor(String color);
     abstract Shape getShape(String shape);
}
public class FactoryProducer {
     public static AbstractFactory getFactory(String choice) {

          if (choice.equalsIgnoreCase("SHAPE")) {
              return new ShapeFactory();

          } else if (choice.equalsIgnoreCase("COLOR")) {
              return new ColorFactory();
          }

          return null;
     }
}

public static void main(String[] args) {

          AbstractFactory shapeFactory = FactoryProducer.getFactory("SHAPE");

          Shape shape1 = shapeFactory.getShape("CIRCLE");

          shape1.draw();

          Shape shape2 = shapeFactory.getShape("RECTANGLE");

          shape2.draw();

          Shape shape3 = shapeFactory.getShape("SQUARE");

          shape3.draw();

          AbstractFactory colorFactory = FactoryProducer.getFactory("COLOR");

          Color color1 = colorFactory.getColor("RED");

          color1.fill();

          Color color2 = colorFactory.getColor("Green");

          color2.fill();

          Color color3 = colorFactory.getColor("BLUE");

          color3.fill();
     }