Java ProgramFollowing the example of the Circle class in Section 9.2, design a class named Rectangle to represent a rectangle. The class contains:- Two double data fields named width and height that specify the width and height of the rectangle. Thedefault values are 1 for both width and height.- A no-arg constructor that creates a default rectangle.- A constructor that creates a rectangle with the specified width and height.- A method named getArea() that returns the area of this rectangle.- A method named getPerimeter() that returns the perimeterDraw the UML diagram for the class then implement the class. Write a test program that creates two Rectangle objects—one with width 4 and height 40, and the other with width 3.5 and height 35.9. Display the width, height, area, and perimeter of each rectangle in this order. Listing 9.2.LISTING 9.2 Circle.java (AlternativeCircle.java)1 public class Circle {T* Main method */public static void main(String[] args) {23|/ Create a circle with radius 1Circle circle1 = new Circle();System.out.println("The area of the circle of radius+ circle1.radius + " is " + circle1.getArea());467|/ Create a circle with radius 25Circle circle2 = new Circle(25);System.out.println("The area of the circle of radius+ circle2.radius + " is " + circle2.getArea());10111213|/ Create a circle with radius 125Circle circle3 = new Circle(125);System.out.println("The area of the circle of radius "+ circle3.radi us + " is " + circle3.getArea(0);1415161718// Modify circle radiuscircle2.radius = 100;System.out.println("The area of the circle of radius+ circle2.radius + " is " + circle2.getArea());}19202122232425double radius;26/** Construct a circle with radius 1 */Circle() {radius = 1;}27282930313233/** Construct a circle with a specified radius *Circle(double newRadius) {radius = newRadius;}343536/** Return the area of this circle */double getArea(0 {return radius * radius * Math.PI;3738394041|** Return the perimeter of this circle */double getPerimeter() {return 2 * radius * Math.PI;424344454647** Set a new radius for this circle */48void setRadius (double newRadius) {49radius = newRadius;5051 }

The Unified Modeling Language (UML) is a general-purpose, developmental, modeling language in the…

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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

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Java Program
Following the example of the Circle class in Section 9.2, design a class named Rectangle to represent a rectangle. The class contains:
- Two double data fields named width and height that specify the width and height of the rectangle. The
default values are 1 for both width and height.
- A no-arg constructor that creates a default rectangle.
- A constructor that creates a rectangle with the specified width and height.
- A method named getArea() that returns the area of this rectangle.
- A method named getPerimeter() that returns the perimeter

Draw the UML diagram for the class then implement the class. Write a test program that creates two Rectangle objects—one with width 4 and height 40, and the other with width 3.5 and height 35.9. Display the width, height, area, and perimeter of each rectangle in this order.

Listing 9.2.
LISTING 9.2 Circle.java (AlternativeCircle.java)
1 public class Circle {
T* Main method */
public static void main(String[] args) {
2
3
|/ Create a circle with radius 1
Circle circle1 = new Circle();
System.out.println("The area of the circle of radius
+ circle1.radius + " is " + circle1.getArea());
4
6
7
|/ Create a circle with radius 25
Circle circle2 = new Circle(25);
System.out.println("The area of the circle of radius
+ circle2.radius + " is " + circle2.getArea());
10
11
12
13
|/ Create a circle with radius 125
Circle circle3 = new Circle(125);
System.out.println("The area of the circle of radius "
+ circle3.radi us + " is " + circle3.getArea(0);
14
15
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18
// Modify circle radius
circle2.radius = 100;
System.out.println("The area of the circle of radius
+ circle2.radius + " is " + circle2.getArea());
}
19
20
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22
23
24
25
double radius;
26
/** Construct a circle with radius 1 */
Circle() {
radius = 1;
}
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33
/** Construct a circle with a specified radius *
Circle(double newRadius) {
radius = newRadius;
}
34
35
36
/** Return the area of this circle */
double getArea(0 {
return radius * radius * Math.PI;
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40
41
|** Return the perimeter of this circle */
double getPerimeter() {
return 2 * radius * Math.PI;
42
43
44
45
46
47
** Set a new radius for this circle */
48
void setRadius (double newRadius) {
49
radius = newRadius;
50
51 }

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