Java Program to Find the Volume of Cylinder

The cylinder is a three-dimensional geometric shape with two parallel circular base surfaces connected by curved surfaces. The volume of a cylinder can be calculated using mathematical formulas that consider its radius and height.

Problem Description

In this tutorial, we will discuss how to calculate the volume of a given cylinder in Java using different methods. Cylinder volume formula

The formula for the volume of the cylinder is as follows:

Cylinder volume = π × r² × h

Of:

• r: The radius of the circular base surface.
• h: The body height of the cylinder.

Example 1

<code>**输入：**
半径 = 5 个单位
高度 = 10 个单位
**输出：**
体积 = 785.4 立方单位
**说明：**
使用公式计算体积：
体积 = π × 5² × 10
体积 = 785.4 立方单位</code>

Example 2

<code>**输入：**
半径 = 7 个单位
高度 = 15 个单位
**输出：**
体积 = 2309.4 立方单位
**说明：**
使用公式计算体积：
体积 = π × 7² × 15
体积 = 2309.4 立方单位</code>

How to calculate the volume of a cylinder in Java?

The following are different ways to calculate the volume of a cylinder in Java:

• Direct formula method
• Using function

Use direct formula method

We use direct formula method in Java to calculate the volume of a cylinder:

Volume = π × r² × h

Implementation steps

• Prefer radius and height as input parameters.
• Use formulas to calculate volume.
• Print the result.

Implementation code

<code class="language-java">import java.text.DecimalFormat;

public class CylinderVolume {
    public static void main(String[] args) {
        double radius = 5;
        double height = 10;
        double volume = Math.PI * Math.pow(radius, 2) * height;
        DecimalFormat df = new DecimalFormat("0.00");
        System.out.println("半径为 " + radius + "，高度为 " + height + " 的圆柱体的体积是： " + df.format(volume) + " 立方单位");
    }
}</code>

Output:

<code>半径为 5.0，高度为 10.0 的圆柱体的体积是： 785.40 立方单位</code>

Time complexity:

O(1)

Space complexity:

O(1)

Using function

In this method, we encapsulate the logic of calculating the volume of the cylinder into a reusable function.

Implementation steps

• Define a function that uses formula to calculate the volume of a cylinder.
• Pass the input value (radius and height) to the function.
• Return the result and print it.

Implementation code

<code class="language-java">import java.text.DecimalFormat;

public class CylinderVolumeFunction {
    static double calculateVolume(double radius, double height) {
        return Math.PI * Math.pow(radius, 2) * height;
    }

    public static void main(String[] args) {
        double radius = 5;
        double height = 10;
        double volume = calculateVolume(radius, height);
        DecimalFormat df = new DecimalFormat("0.00");
        System.out.println("半径为 " + radius + "，高度为 " + height + " 的圆柱体的体积是： " + df.format(volume) + " 立方单位");
    }
}</code>

Output:

<code>半径为 5.0，高度为 10.0 的圆柱体的体积是： 785.40 立方单位</code>

Time complexity:

O(1)

Space complexity:

O(1)

Using these methods, you can easily calculate the volume of cylinders in Java while keeping your code simple and modular. Choose the method that best suits your needs!

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