Question

我已经查看了一些其他问题，询问了类似的问题，但我试图称之为双重＆＃39;第三个价格＆＃39;从calculationMethod（）到main（）。此程序的目的是在main（）中请求数据，将一些信息传递给calculationMethod（），然后将该数据返回main（）以进行最终输出。我正在使用DrJava，到目前为止这是我的代码。

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(); //Passes variable for calculation
        System.out.println("Enter the cost of materials prior to discount "); //Enter cost of materials
        costMaterials = inputDevice.nextDouble(); //Passes variable for calculation
        System.out.println("Enter the number of hours worked "); //Enter hours worked
        hoursWorked = inputDevice.nextDouble(); //Passes variable for calculation
        System.out.printf("The cost of " + productName + " is %.2f\n" , thirdPrice);
        //Output product name and cost
    }
    public static void 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 * 7; //Calculates fisr portion of equation
        double secondPrice = 7 + 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
    }
}

尝试编译时收到的错误如下：

找到2个错误：文件：C：\ Users \ unkno \ DrJava \ Java \ CraftPricing.java [line：18] 错误：找不到符号符号：变量thirdPrice location：class CraftPricing 文件：C：\ Users \ unkno \ DrJava \ Java \ CraftPricing.java [line：28] 错误：不兼容的类型：意外返回值

Answer 1

为什么你需要一个变量？

调用方法。

System.out.printf("The cost of %s is %.2f\n" , productName, calculationMethod());

或了解变量范围。

并修复返回类型。

public static double calculationMethod()

无法从第二个字符串调用数据

1 个答案: