Question

The assignment will be graded both running and reading your code.

Readability: Your code should be readable. Add comments wherever is necessary.
If needed, write helper functions to break the code into small, readable chunks.

Write two concrete classes implementing GeometricShape

The class Circle. Circle will have the following public methods:

// a constructor
Circle(Point center, int radius);

// returns the area of the circle
float getArea();

// returns the perimeter of the circle
float getPerimeter();

// prints the center of the circle and its radius
virtual void print();

The class Rectangle. Rectangle will have the following public methods:

// a constructor
Rectangle(Point topLeftPoint, int length, int width);

// returns the area of the rectangle
float getArea();

// returns the perimeter of the circle
float getPerimeter();

// prints the top left point of the rectangle, its length and width
virtual void print();

Write a function test() that tests your solutions.

Answer 1

import java.util.*; import java.lang.*; import java.io.*; class Point { private int x; private int y; public Point() { this.x = 0; this.y = 0; } public Point(int x,int y) { this.x = x; this.y = y; } public int getX() { return this.x; } public int getY() { return this.y; } public void setX(int x) { this.x = x; } public void setY(int y) { this.y = y; } public String toString() { return "Point("+getX() +","+getY()+")"; } }; class Rectangle extends Point { private Point p; private double length; private double width; public Rectangle() { p.setX(0); p.setY(0); length = 0; width =0; } public Rectangle(Point p,double length,double width) { this.p = p; this.length = length; this.width = width; } public double getWidth() { return width; } public double getLength() { return length; } public Point getPoint() { return this.p; } public double getArea() //compute the area of the rectangle. { double area; area = getWidth() * getLength(); return area; } public double getPerimeter() //compute the perimeter of the rectangle { double perimeter; perimeter = 2*(getWidth()+getLength()); return perimeter; } public String toString() { return "Rectangle : Top left Point :"+ getPoint() +" width :"+getWidth() + " height :"+getLength(); } } class Circle extends Point { private Point p; private double radius; public Circle() { p.setX(0); p.setY(0); radius =0; } public Circle(Point p,double radius) { this.p = p; this.radius = radius; } public double getRadius() { return radius; } public Point getPoint() { return this.p; } public double getArea() //compute the area of the circle. { double area; area = 3.14 * getRadius() * getRadius(); return area; } public double getPerimeter() //compute the perimeter of the circle { double perimeter; perimeter = 2* 3.14 *getRadius(); return perimeter; } public String toString() { return "Circle : center Point:"+ getPoint() +" radius "+getRadius(); } } class Square extends Point { private Point p; private double length; public Square() { p.setX(0); p.setY(0); length = 0; } public Square(Point p,double length) { this.p = p; this.length = length; } public double getLength() { return length; } public Point getPoint() { return this.p; } public void setLength(double length) { this.length = length; } public double getArea() //compute the area of the square. { double area; area = getLength() * getLength(); return area; } public double getPerimeter() //compute the perimeter of the square { double perimeter; perimeter = 4*(getLength()); return perimeter; } public String toString() { return "Square : Top left Point :"+ getPoint() +" length :"+getLength() ; } } class GeometricTest { public static void main (String[] args) { Point pc = new Point(7,3); Circle c = new Circle(pc,4.5); System.out.println(c.toString()); System.out.println("Area of circle = "+c.getArea()); System.out.println("Perimeter of circle = "+c.getPerimeter()); Point pr = new Point(3,-1); Rectangle r = new Rectangle(pr,4.0,6.0); System.out.println(r.toString()); System.out.println("Area of rectangle = "+r.getArea()); System.out.println("Perimeter of rectangle = "+r.getPerimeter()); Point ps = new Point(5,8); Square s = new Square(ps,2.0); s.setLength(5.0); System.out.println(s.toString()); System.out.println("Area of square = "+s.getArea()); System.out.println("Perimeter of square = "+s.getPerimeter()); Point p1 = r.getPoint(); Point p2 = s.getPoint(); if(p1.getX() >p2.getX()) System.out.println("x-coordinate of rectangle is greater than x-coordinate of square"); else System.out.println("x-coordinate of square is greater than x-coordinate of rectangle"); } } output: Circle : center Point:Point(7,3) radius 4.5 Area of circle = 63.585 Perimeter of circle = 28.26 Rectangle : Top left Point :Point(3,-1) width :6.0 height :4.0 Area of rectangle = 24.0 Perimeter of rectangle = 20.0 Square : Top left Point :Point(5,8) length :5.0 Area of square = 25.0 Perimeter of square = 20.0 x-coordinate of square is greater than x-coordinate of rectangle