Java Code Example: Volume and Surface Area of a Sphere

A ball (sphere) is a three-dimensional shape with a perfectly round surface. The volume and surface area of a sphere are important mathematical properties used in physics, engineering, and computer graphics.

Formulas:

Volume of a Sphere:

where r is the radius of the sphere.

Surface Area of a Sphere:

where r is the radius of the sphere.

We will create a Java program that takes the radius as input and calculates both the volume and surface area of a sphere.

Java Code Example

public class SphereCalculator {
    // Method to calculate volume of the sphere
    public static double calculateVolume(double radius) {
        return (4.0 / 3.0) * Math.PI * Math.pow(radius, 3);
    }

    // Method to calculate surface area of the sphere
    public static double calculateSurfaceArea(double radius) {
        return 4 * Math.PI * Math.pow(radius, 2);
    }

    public static void main(String[] args) {
        double radius = 5.0; // Example radius

        double volume = calculateVolume(radius);
        double surfaceArea = calculateSurfaceArea(radius);

        System.out.println("For a sphere with radius " + radius + ":");
        System.out.println("Volume = " + volume);
        System.out.println("Surface Area = " + surfaceArea);
    }
}

Output

For a sphere with radius 5.0:
Volume = 523.5987755982989
Surface Area = 314.1592653589793

Explanation

1. Method for Volume Calculation
   • Uses the formula V=43πr3V = \frac{4}{3} \pi r^3V=34​πr3.
   • Math.pow(radius, 3) calculates r³.
   • Math.PI provides the value of π.
2. Method for Surface Area Calculation
   • Uses the formula A=4πr2A = 4 \pi r^2A=4πr2.
   • Math.pow(radius, 2) calculates r².
3. Main Method Execution
   • We define a radius (e.g., 5.0).
   • We call both methods and print the calculated volume and surface area.

Key Takeaways

✅ Uses Java’s Math class for precise calculations.
✅ Separates calculations into methods for better code organization.
✅ Easily adaptable – can take user input for dynamic radius values.