mhtmalpani

public class Duck implements Animal {

    @Override
    public String makeNoise() {
        return "Quack";
    }
}

mhtmalpani

public class AnimalFactory {

    public Animal getAnimal(String animal) {

        if (animal == null)
            return null;

        else if (animal.equalsIgnoreCase(Dog.class.getSimpleName()))
            return new Dog();

mhtmalpani

public class MainWithRuntimeInput {

    public static void main(String[] args) {

        Scanner reader = new Scanner(System.in);
        System.out.print("Enter an Animal: ");
        String animalName = reader.next();
        reader.close();

mhtmalpani

public class Main {

    public static void main(String[] args) {

        //Create instance of Factory
        AnimalFactory animalFactory = new AnimalFactory();


        //Obtain Dog object from the factory
        Animal dog = animalFactory.getAnimal("Dog");

mhtmalpani

public interface Shape {

    void draw();
}

mhtmalpani

public class Circle implements Shape {

    @Override
    public void draw() {
        System.out.println("Drawing a Circle");
    }
}

mhtmalpani

public class Rectangle implements Shape {

    @Override
    public void draw() {
        System.out.println("Drawing a Rectangle");
    }
}

mhtmalpani

public class Square implements Shape {

    @Override
    public void draw() {
        System.out.println("Drawing a Square");
    }
}

mhtmalpani

public interface Color {

    void paint();
}

mhtmalpani

public class Blue implements Color {

    @Override
    public void paint() {
        System.out.println("Painting color Blue");
    }
}