Design Patterns - Factory Pattern

factory.java

import java.io.*;

interface Shape
{
	public void draw();
}

class Square implements Shape
{
	@Override
	public void draw()
	{
		System.out.println("Square Drawn");
	}
}

class Circle implements Shape
{
	@Override
	public void draw()
	{
		System.out.println("Circle Drawn");
	}
}

class ShapeFactory
{
	public static Shape getShape(String shape)
	{
		if(shape == "square")
			return new Square();
		else if(shape == "circle")
			return new Circle();
		else
			return null;
	}
}

public class factory
{
	public static void main(String args[])
	{
		Shape shape1 = ShapeFactory.getShape("circle");
		shape1.draw();
		shape1 = ShapeFactory.getShape("square");
		shape1.draw();
		
	}
}