java Tester类构造函数错误

Question

这是我必须回答的家庭作业问题：实现一个类SodaCan，其构造函数接收高度和直径或汽水罐。提供方法getVolume和getSurfaceArea。提供一个测试类的SodaCanTester类

这是我为SodaCan类编写的代码

public class SodaCan
{
    private double Height;
    private double Radius;

    public SodaCan(double h, double d) {
        Height = h;
        Radius = d/2;
    }

    public double getVolume()
    {
        return Math.PI * Height * Math.pow(Radius, 2);
    }

    public double getSurfaceArea()
    {
        return (2 * Math.PI * Radius * Height) + 
        (2 * Math.PI * Math.pow(Radius, 2));
    }   
}

这是我为SodaCanTester类编写的代码

public class SodaCanTester
{
    public static void main(String[] args)
    {
       SodaCan cylinder = new SodaCan();
       cylinder.enterHeight(5);
       cylinder.enterRadius(8);
       System.out.println("Volume: " + getVolume());
       System.out.println("Expected Volume: 1005.31");
       System.out.println("Surface Area: " + getSurfaceArea());
       System.out.println("Expected Surface Area: 653.45");
    }
}

当我试图编译tester类时，构造函数出现了一个错误：

SodaCan cylinder = new SodaCan();

也就是说：

"constructor SodaCan in class SodaCan cannot be applied to given types".

我做错了什么，我该如何解决

Answer 1

因为，您的类中有args构造函数SodaCan

public SodaCan(double h, double d) {
    Height = h;
    Radius = d/2;
}

如果你想让下面的代码正常工作，你需要显式地声明没有参数构造函数

SodaCan cylinder = new SodaCan();

编辑==

你的代码应该是这样的

public SodaCan(double h, double d) {
    Height = h;
    Radius = d/2;
}

public SodaCan(){}