In addition to the Main class, the above project contains the class Shape, which is needed for this project the Shape class contains:1 protected instance variable to store the shape's id number.1 private static variable to store the id number for the next object to be created (used to help each object have a unique id number)1 protected default constructor (with no arguments) that sets the shape's id number to be unique, using the static variable to help with that.1 public method called getId which returns the object's id2 public methods: area and perimeter, which are really just meant to be overridden. Later we'll learn how this can be done better with abstract methods.Here are the 3 classes you should write followed by their details:CircleCircle should be a sub-class of Shape, so it inherits all of the above plus...1 protected instance variable to store the circle's radius.1 public constructor with 1 argument to initialize the radius.2 public methods which override Shape methods: area and perimeter. (Use the @Override annotation.) They should return the area and perimeter of the circle. You can use Math.PI to get an accurate value of π.RectangleRectangle should be a sub-class of Shape, so it inherits all of Shape's members plus...2 protected instance variables to store the rectangle's length and height.1 public constructor with 2 arguments to initialize the length and height.2 public methods: area and perimeter. (Again, use the @Override annotation.) They should return the area and perimeter of the rectangle.SquareSquare should be a sub-class of Rectangle, so it inherits all of Rectangle's members plus...1 public constructor with 1 argument to initialize the length and height to be that value.You don't need to write area or perimeter, because the inherited code from Rectangle works just fine for a square.Test program for Assignment 10 ShapeHierarchy.Uses Shape, Circle, Rectangle, and Square.YOUR JOB IS TO WRITE THE Circle, Rectangle,and Square CLASSES SO THIS PROGRAMPRODUCES THE OUTPUT SHOWN AT BOTTOM.DO NOT CHANGE THIS FILE*/class Main{publicstaticvoid main(String[] args){// Array to store all types of Shape objects:Shape[] shapes = new Shape[4];// Parallel array to store text descriptions of each shape.String[] descriptions = new String[4];shapes[0] = new Circle(10);descriptions[0] = "10 unit radius Circle";shapes[1] = new Rectangle(15, 25);descriptions[1] = "15x25 Rectangle";shapes[2] = new Square(20);descriptions[2] = "20 unit Square";shapes[3] = new Circle(2);descriptions[3] = "2 unit radius Circle";System.out.println("This program examines the ratio of area to perimeter");System.out.println("for a few different shapes.");System.out.println("(The larger the ratio, the greater the efficiency of space contained)");for(int i=0; i<shapes.length && i<descriptions.length; i++){System.out.println("Shape #" + shapes[i].getId()+ " is a " + descriptions[i] + " with ratio "+ shapes[i].area() / shapes[i].perimeter());}}}/* Output:This program examines the ratio of area to perimeterfor a few different shapes.(The larger the ratio, the greater the efficiency of space contained)Shape #1 is a 10 unit radius Circle with ratio 5.0Shape #2 is a 15x25 Rectangle with ratio 4.6875Shape #3 is a 20 unit Square with ratio 5.0Shape #4 is a 2 unit radius Circle with ratio 1.0*/

Solution: Programming language used: Java Program in Java (Note: all necessary comments are…

Answered: In addition to the Main class, the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Here are the 3 classes you should write followed by their details:

Circle
- Circle should be a sub-class of Shape, so it inherits all of the above plus...
- 1 protected instance variable to store the circle's radius.
- 1 public constructor with 1 argument to initialize the radius.
- 2 public methods which override Shape methods: area and perimeter. (Use the @Override annotation.) They should return the area and perimeter of the circle. You can use Math.PI to get an accurate value of π.
Rectangle
- Rectangle should be a sub-class of Shape, so it inherits all of Shape's members plus...
- 2 protected instance variables to store the rectangle's length and height.
- 1 public constructor with 2 arguments to initialize the length and height.
- 2 public methods: area and perimeter. (Again, use the @Override annotation.) They should return the area and perimeter of the rectangle.
Square
- Square should be a sub-class of Rectangle, so it inherits all of Rectangle's members plus...
- 1 public constructor with 1 argument to initialize the length and height to be that value.
- You don't need to write area or perimeter, because the inherited code from Rectangle works just fine for a square.

Test program for Assignment 10 ShapeHierarchy.

Uses Shape, Circle, Rectangle, and Square.

YOUR JOB IS TO WRITE THE Circle, Rectangle,

and Square CLASSES SO THIS PROGRAM

PRODUCES THE OUTPUT SHOWN AT BOTTOM.

DO NOT CHANGE THIS FILE

class Main

{

publicstaticvoid main(String[] args)

{

// Array to store all types of Shape objects:

Shape[] shapes = new Shape[4];

// Parallel array to store text descriptions of each shape.

String[] descriptions = new String[4];

shapes[0] = new Circle(10);

descriptions[0] = "10 unit radius Circle";

shapes[1] = new Rectangle(15, 25);

descriptions[1] = "15x25 Rectangle";

shapes[2] = new Square(20);

descriptions[2] = "20 unit Square";

shapes[3] = new Circle(2);

descriptions[3] = "2 unit radius Circle";

System.out.println("This program examines the ratio of area to perimeter");

System.out.println("for a few different shapes.");

System.out.println("(The larger the ratio, the greater the efficiency of space contained)");

for(int i=0; i<shapes.length && i<descriptions.length; i++)

{

System.out.println("Shape #" + shapes[i].getId()

+ " is a " + descriptions[i] + " with ratio "

+ shapes[i].area() / shapes[i].perimeter());

}

/* Output:

This program examines the ratio of area to perimeter

for a few different shapes.

(The larger the ratio, the greater the efficiency of space contained)

Shape #1 is a 10 unit radius Circle with ratio 5.0

Shape #2 is a 15x25 Rectangle with ratio 4.6875

Shape #3 is a 20 unit Square with ratio 5.0

Shape #4 is a 2 unit radius Circle with ratio 1.0

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