使用toString()方法打印 [英] Print with toString() method

问题描述

class Box
{
    // Instance Variables
    double length ,ipsos ;
    double width ,mikos ;
    double height ,platos;
    // Constructors
    public Box ( double side )
    {
        width = side ;
        height = side ;
        length = side ;
    }
    public Box ( double x , double y , double z)
    {
        platos = y ;
        ipsos = z;
        mikos = x ;
    }

    // Methods
    double calculate(double praksi)
    {
        return 2 * ( width * height +
        width * length +
        height * length ) ;
    }
    double volume(double emvadon)
    {
        return platos*ipsos*mikos ;
    }

}

在上面的代码中，如何制作toString()方法，所以我可以返回volume的值并计算??? 我是Java的新手，所以请尽可能简单

In the upper code, how can I make a toString() method, so I can return the values of volume and calculate ??? Im new with java so be as simple as you can please

推荐答案

将此方法添加到您的类中(以覆盖toString()方法):

Add this method to your class (to override the toString() method):

@Override
public String toString() {
    return "Volume: " + volume(1) + "\n Calculate: " + calculate(1);
}

注意:@Override是可选的:它只是通信，如果错拼了覆盖的方法(toString())，请确保收到错误.

Note: @Override is optional: it's just communication and making sure you receive an error if you misspell the overridden method (toString()).

此外，为什么不使用volume和calculate的参数?这就是为什么我将诸如1之类的随机数传递给他们的原因，因为它们显然无关紧要.

Also, why do you have parameters for volume and calculate if you don't use them? That's why I passed them a random number like 1 because it apparently doesn't matter what they are.

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