Write the 3 classes for the Java code below. the 3 classes and 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. 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. Code: 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/

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

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Write the 3 classes for the Java code below.

the 3 classes and 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.
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.

Code:

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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