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java - 调用方法、参数和参数

问题描述

这可能是一个愚蠢的问题。我的以下代码看起来不错，但在输出上，它并不期望我的测试场景有结果。代码如下：

 import java.util.Scanner;
  public class PartyPlannerLab {
                      public static Scanner input = new Scanner(System.in);

    public static int getGuestCount(int guests) {
        while(true) {
            System.out.print("Enter number of guests: ");
            guests = input.nextInt();
            if (guests >= 1 && guests <= 100)
                break;
            else 
                System.out.println("The guest count must be at least 1, but does not exceed 100. Please enter again.");
        }
        return guests;
    }
    public static int getSlicesPerPerson(int slicesPerPerson) {
        while(true) {
        System.out.print("Enter number of slices per person: ");
        slicesPerPerson = input.nextInt();
        if (slicesPerPerson >= 1 && slicesPerPerson <= 8)
            break;
        else
            System.out.println("The pizza slice count must be at least 1, but does not exceed 8. Please try again.");
        }
        return slicesPerPerson;
    }
    public static double computeRoomCost(int guests, double roomCost) {
        if (guests <= 30)
            roomCost = 100.00;
        else
            roomCost = 200.00;
        return roomCost;
    }
    public static double computeSodaCost(double sodaCost, int guests) {
        sodaCost = guests * 1.50;
        return sodaCost;

    }
    public static void printSummary(int guests, double roomCost, double sodaCost, double pizzaCost) {
        System.out.println("Total Guests: " + guests);
        System.out.println("RoomCost: $" + roomCost);
        System.out.println("SodaCost: $" + sodaCost);
        System.out.println("PizzaCost: $" + pizzaCost);
        System.out.println("Total Cost: $" +(roomCost + sodaCost + pizzaCost));
    }
    public static void main(String[] args) {
        int guests = 0;
        int slicesPerPerson = 0;
        double roomCost = 0.0;
        double sodaCost = 0.0;
        double pizzaCost = 0.0;
        getGuestCount(guests);
        getSlicesPerPerson(slicesPerPerson);
        computeRoomCost(guests, roomCost);
        computeSodaCost(sodaCost, guests);
        printSummary(guests, roomCost, sodaCost, pizzaCost);

        input.close();
    }


    }

一个输出如下：

Enter number of guests: 10
Enter number of slices per person: 2
Total Guests: 0
RoomCost: $0.0
SodaCost: $0.0
PizzaCost: $0.0
Total Cost: $0.0

标签： javamethodsparametersargumentscall

解决方案

您没有得到输出的原因是您在 main 方法中初始化的值没有随着您正在进行的方法调用而更新。

下面的代码可能会解决您面临的问题 -

 public static void main(String[] args) {
    int guests = 0;
    int slicesPerPerson = 0;
    double roomCost = 0.0;
    double sodaCost = 0.0;
    double pizzaCost = 0.0;
    guests = getGuestCount(guests);
    slicesPerPerson = getSlicesPerPerson(slicesPerPerson);
    roomCost = computeRoomCost(guests, roomCost);
    sodaCost = computeSodaCost(sodaCost, guests);
    printSummary(guests, roomCost, sodaCost, pizzaCost);

    input.close();
}

注意 -不需要在getGuestCount 和 getSlicesPerPerson方法中传递参数，因为输入是从 I/O 获取的

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