a) Implement a subclass Square that extends the Rectangle class. In the constructor accept the x and y positions of the centre and the side length of the square. (Use the setLocation and setSize methods of the Rectangle class from the Java API).
b) Supply a method getArea that computes and returns the area of the square.
c) Write a test harness that creates a new Square object and then prints out its details using the toString method that has been inherited from the Retangle class.
d) Also print out the area of the Square.