In this lab, you will demonstrate the very basics of object oriented programming. You will create 4 classes:

1. An abstract class called Shape 2. A child class of Shape called Circle 3. A child class of Shape called Rectangle 4. A child class of Rectangle called Square

Specifications

Each class must implement the following function signatures:

/** @return the area of the shape*/ public double getArea() { //TODO }

/** @return the length of the perimeter of the shape */ public double getPerimeter() { //TODO } In addition, the Circle, Rectangle, and Square classes must implement the following constructor signatures respectively:

public Circle(double radius) { //TODO }

public Rectangle(double length, double width) { //TODO }

public Square(double sideLength) { //TODO }