Question

A general shape class is shown below. Shape has a dimension. It also defines 
constructors, getters, setters and a toString method. 


class Shape{
 int dimension;
 public Shape(){}
 
 public Shape(int newDimension){
  dimension = newDimension;
 }
 
 public int getDimension(){
  return dimension;
 }
 
 public void setDimension(int newDimension){
  dimension = newDimension;
 }
 
 public String toString(){
  return "Shape has dimension "+dimension;
 }
}

a. Define classes Circle and Square, which inherit from Shape class.
b. Both classes must have two constructors similar to Shape class.
c. They must also implement a getArea method which returns the area of the shape.
   For circle dimension is the radius; for square it is the side. For Circle getArea
   must return a double, while for Square it is an int.
d. Also overload toString method, to return a String representing description
   (like Circle has radius 10 or Square has side 10).

e. Define a new class Rectangle that has a new intger variable breadth.  The length
   of the rectangle is the superclass variable dimension.
   (Use dimension in code for length in, getArea and toString method. You need not
   create a new local variable).

f. Define a constructor for Rectangle that takes two integers and sets the dimension and breadth.

g. Define a getter and setter for breadth in Rectangle class.

h. Also define a getArea method and toString method for the Rectangle class.

You can use the sample program below to test your code.

public class Problem6 {

 public static void main(String[] args) {
  Square s = new Square(10);
  System.out.println(s);
  System.out.println("Side = "+s.getDimension());
  System.out.println("Area = "+s.getArea());
  System.out.println();
  
  Circle c = new Circle(10);
  System.out.println(c);
  c.setDimension(5);
  System.out.println("Area = "+c.getArea());
  System.out.println();
  
  Rectangle r = new Rectangle(5, 10);
  System.out.println(r);
  System.out.println("Breadth = "+r.getBreadth());
  System.out.println("Area = "+r.getArea());
 }

}

Sample Output:
--------------
Square has side 10
Side = 10
Area = 100

Cirlce has radius 10
Area = 78.53981633974483

Rectangle has length 5 breadth 10
Breadth = 10
Area = 50