无法让程序在命令行中编译但在Eclipse上工作？

Question

我有两个类：我不能让他们中的任何一个在命令行中编译：我使用的是javac SodaCan.java提示符，但它仍然不会编译，它会显示如下内容：“error：Class，interface或enum expected “双，sodaCan，getvolume等

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class关键字

public class SodaCan {