FactorypattenDemo.java

 interface Shape {
    void draw();
}
  class Circle implements Shape{
    public void draw(){
        System.out.println("Drawing a Circle.");
    }
}
  class Square implements Shape{
    public void draw(){
        System.out.println("Drawing a Square");
    }
} 
class ShapeFactory{
    public Shape getShape (String shapeType){
        if(shapeType == null) 
        return null;
        switch (shapeType . toLowerCase()) {
            case "circle": return new Circle();
            case "square": return new Square();
            default: return null;
        }

    }
}
  public class FactorypattenDemo{
    public static void main (String[] args){
        ShapeFactory factory = new ShapeFactory();
        Shape shape1 = factory.getShape("circle");
        shape1.draw();
        Shape shape2 = factory.getShape ("square");
        shape2.draw();

    }
 }