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.

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
16
17
18
// Modify circle radius
circle2.radius = 100;
System.out.println("The area of the circle of radius
+ circle2.radius + " is " + circle2.getArea());
}
19
20
21
22
23
24
25
double radius;
26
/** Construct a circle with radius 1 */
Circle() {
radius = 1;
}
27
28
29
30
31
32
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;
37
38
39
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 }
Transcribed Image Text: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 16 17 18 // Modify circle radius circle2.radius = 100; System.out.println("The area of the circle of radius + circle2.radius + " is " + circle2.getArea()); } 19 20 21 22 23 24 25 double radius; 26 /** Construct a circle with radius 1 */ Circle() { radius = 1; } 27 28 29 30 31 32 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; 37 38 39 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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