Defining Classes II - Absolute Java - page 265

Display 5.2 Class Dei nition with a main Added

1 import java.util.Scanner;

2 /**
3 Class with static methods for circles and spheres.
4 */
5 public class RoundStuff2
6 {
7 public static final double PI = 3.14159;

8 /**
9 Return the area of a circle of the given radius.
10 */
11 public static double area( double radius)
12 {
13 return (PI*radius*radius);
14 }
15
16 /**
17 Return the volume of a sphere of the given radius.
18 */
19 public static double volume( double radius)
20 {
21 return ((4.0/3.0)*PI*radius*radius*radius);
22 }

23 public static void main(String[] args)
24 {
25 Scanner keyboard = new Scanner(System.in);
26 System.out.println("Enter radius:");
27 double radius = keyboard.nextDouble();
28
29 System.out.println("A circle of radius "
30 + radius + "inches");
31 System.out.println("has an area of " +
32 RoundStuff.area(radius) + " square inches.");
33 System.out.println("A sphere of radius "
34 + radius + "inches");
35 System.out.println("has an volume of " +
36 RoundStuff.volume(radius) + " cubic inches.");
37 }
38 }

The dialogue is the same as in
Display 5.1 .