Shape.java

public class Shape{
   //It could be a circle or rectangle or square
   private String type;

   //To calculate area of rectangle
   public Double area(Long length, Long breadth){
    	return (Double) length * breadth;
   }

   //To calculate area of a circle
   public Double area(Long radius){
   	 return (Double) 3.14 * r * r;
   }
 }