调用方法和使用正确的循环

Question

我正在创建一个程序，它基本上会询问用户他们想要购买什么并给他们总计。

我应该在Main之外使用2个单独的方法来完成这个任务：

1. 一种获取用户输入的方法，他们想要执行哪种服务，此方法还会告诉用户服务的总成本（超出税和劳动力）
2. 计算人工成本和税费的另一种方法

第一种方法应该将总成本返回到main方法，第二种方法应该从main方法获得总数并计算加入人工和税后的最终成本。

（如果汽车是进口的，应加上总量的5％）

这是我到目前为止所做的：

import java.util.Scanner;
public class Assign3 {

    public static double carMaintenance(String userCar) {
        Scanner input = new Scanner(System.in);

        String service_ordered="";
        String more="yes";
        double amount;
        double total=0;
        //declare and intialize parallel arrays, Services and Prices and display them to the user
        String[] services = {"Oil Change" , "Tire Rotation", "Air Filter", "Fluid Check"}; //intialize list of services
        double[]price = {39.99, 49.99, 19.99, 10.99}; //initialize corresponding price for services
        for(int i= 0; i < services.length; i++) {
            System.out.print( services[i]+ "...." );    
            System.out.print( price[i] + "\t");  
        }

        do // *****2. THIS IS WHAT IS BEING EXECUTED FROM THE METHOD CALL IN MAIN *****
        {
            System.out.print("What service do you want done?: ");
            String choice = input.nextLine();
            if (choice.equalsIgnoreCase("oil change")) {
                System.out.println("You chose an oil change");
                amount = 39.99;
                total = total + amount;
                service_ordered+="Oil Change ";
                System.out.print("Do you want to do another service? ");
                more = input.nextLine();
            } else if (choice.equalsIgnoreCase("tire rotation")) {
                System.out.println("You chose a tire rotation");
                amount = 49.99;
                total = total + amount;
                service_ordered+="Tire Rotation ";
                System.out.print("Do you want to do another service? ");
                more = input.nextLine();
            } else if (choice.equalsIgnoreCase("air filter")) {
                System.out.println("You chose an air filter");
                amount = 19.99;
                total = total + amount;
                service_ordered+="Air Filter ";
                System.out.print("Do you want to do another service? ");
                more = input.nextLine();
            } else if (choice.equalsIgnoreCase("fluid check")) {
                System.out.println("You chose a flud check");
                amount = 10.99;
                total = total + amount;
                service_ordered+="Fluid Check ";
                System.out.print("Do you want to do another service? ");
                more = input.nextLine();
            } 
        } while (more.equalsIgnoreCase("yes"));
        System.out.println("You ordered: " + service_ordered);
        System.out.println("Your total due is " + total);

        return total;
    }

    public static void main(String[]args) {
        Scanner input = new Scanner(System.in);

        System.out.println("What kind of car do you have?: "); //****1. CODE STARTS HERE *****
        String userCar = input.nextLine();


        double total = carMaintenance(userCar); //*****2. CODE CALLS THIS METHOD AND EXECUTES IT *****

        calcFinalPrice(total);
    }

    public static void calcFinalPrice(double total) {

        double salesTax=.08;
        double laborFee=.3;
        double importFee=.05;

        Scanner input = new Scanner(System.in);

        System.out.println("Is your vehicle an import?: "); 
        String isImport = input.nextLine();
        if(isImport.equals("yes")) {
            total=total*laborFee+total;  // this is the labor fee
            double importTotal = total*importFee+total;
            double totalAfterTax = importTotal*salesTax+importTotal;    //this is the import total aftertax
            System.out.println("It will cost " + totalAfterTax + " to fix your vehicle.");
        }

        if(isImport.equals("no")) {
            total=total*laborFee+total;  // this is the labor fee
            double totalAfterTax = total*salesTax+total;    //this is the total aftertax
            System.out.println("It will cost " + totalAfterTax + " to fix your vehicle ");
        }
    }
}