java - 无法在命令行中编译程序但可以在 Eclipse 上运行？

Question

我有两个类:我无法在命令行中编译它们中的任何一个:我正在使用 javac SodaCan.java 提示符，但它仍然无法编译，它显示如下内容:“错误:类、接口(interface)或枚举double、sodaCan、getvolume 等的预期“。

public SodaCan{
    private double sArea;
    private double volume;

    public SodaCan(double height, double radius){
        getSurfaceArea(height);
        getVolume(radius);
    }

    public double getSurfaceArea(double height, double radius){
        sArea = 2*Math.PI * Math.pow(radius, 2) + 2 * Math.PI * radius * height;

        return sArea;
    }

    public double getVolume(double height, double radius){
        volume = Math.PI * Math.pow(radius, 2) * height;
    }
}

和

import java.util.*;

public class testSodaCan{
    public static void main(String[] args){
        double height, radius;
        Scanner s = new Scanner(System.in);
        System.out.println("Please  input the height of the can: ");
        height = s.nextDouble();
        System.out.println("Please  input the width of the can: ");
        radius = s.nextDouble();
        SodaCan  can = new SodaCan(height, radius);
    }
}

Answer 1

添加类关键字

public class SodaCan {