java - 将数据从输入扫描仪传递到另一种方法

Question

尝试按顺序将 costMaterials 和 hoursWorked 的输入从 main() 传递到 calculationMethod()正确计算thirdPrice。我尝试将主字符串的 void 更改为 double 以便 main() 可以返回值。由于我仍然不知道/理解的原因，这不起作用。我还在 Oracle 网站上搜索了有关此问题的教程，但似乎找不到。任何帮助将不胜感激。

import java.util.Scanner; //Imports input device
public class CraftPricing
{
    public static void main(String[] args)
    {
        Scanner inputDevice = new Scanner(System.in); //Sets up input device
        String productName; //Used for naming product
        double costMaterials, hoursWorked; //Gives variables decimal format
        System.out.println("Enter the name of the product "); //Enter product name
        productName = inputDevice.nextLine(); //Inputs product name
        System.out.println("Enter the cost of materials prior to discount "); //Enter cost of materials
        costMaterials = inputDevice.nextDouble(); //Inputs cost of materials
        System.out.println("Enter the number of hours worked "); //Enter hours worked
        hoursWorked = inputDevice.nextDouble(); //Inputs hours worked
        System.out.printf("The cost of " + productName + " is %.2f\n" , calculationMethod());
        //Output product name and cost
    }
    public static double calculationMethod() //Method used to calcualte price
    {
        double itemDiscount = 0.75; //Gives decimal format to variable
        double payRate = 14.00; //Gives decimal format to variable
        double shipHandle = 6.00; //Gives decimal format to variable
        double firstPrice = payRate * hoursWorked; //Calculates first portion of equation
        double secondPrice = costMaterials + firstPrice; //Calculates second portion of equation
        final double thirdPrice = itemDiscount * secondPrice + shipHandle;
        //Calculates final portion of equation
        return thirdPrice; //Returns double to main() for output
    }
}

Answer 1

让我们像这样声明您的计算方法:

public static double calculationMethod(double costMaterials, double hoursWorked)

并在main中调用它:

calculationMethod(costMaterials, hoursWorked)