java compiling error in command prompt

Question

Error: Main method not found in class volume, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application

import java.util.*;
class volume {

    private int x;

    public float volume(float l) {
    return (l * l * l);
    }

    public float volume(float r, float h) {
    return (3.14f * r * r * h);
    }

    public float volume(float l, float b, float h) {
    return (l * b * h);
    }
}

class main {

    public static void main(String[] args) {
    volume a = new volume();
    System.out.println("volume of cube=" + a.volume(10));
    System.out.println("volume of cylinder=" + a.volume(10, 10));
    System.out.println("volume of cuboid=" + a.volume(10, 10, 10));
    }
}

Answer 1

Move your main method to volume class and make volume class public. You don't need class main .

Answer 2

删除类main {和}，然后在Volume类中有一个main方法

Answer 3

Your program works fine. you just compile the main class and execute the main class.

Answer 4

Logically, the main method should be inside the class Volume. In spite of that, your code should have worked. But the real reason you are getting the error is because remember: in Java, the class names have to start with an uppercase.

Simply rename the class volume as Volume, and main as Main and it should work.

Answer 5

Please change your public class in your program. Then everything works fine.