如何使用Java Util.Scanner正確使用並行數組？

Question

我正在處理數組任務。 我必須使用並行數組，但是，我想讓代碼生成所需的輸出時遇到了困難。 問題出在代碼末尾要求輸入的地方。 我試過做String [i] days.nextLine ， String days next.Line ，但是它不起作用。

我將提供一張圖片以闡明我要做什么。 警告：圖片模糊。 到目前為止，我做得很好，這是提出挑戰的最后三個部分。 稍后我將添加折扣部分。 謝謝。

  System.out.println("Weekday     Drink       Original-Price     Discount-Price");
  System.out.println("------------------------------------------------------");
  System.out.println(day +  drink  + price      +          "IDK"      );

import java.util.Scanner;

public class Cafeteria 
{
    public static void main (String [] args)
    {
        String [] days = {"Monday: ", "Tuesday: ", "Wednesday: ", "Thursday: ", "Friday: ", "Saturday: ", "Sunday: "}; 
        String [] drinks = {"Soda", "Sweet Tea", "Lemonade", "Frozen   Lemonade", "Coffee-Hot", "Coffee-Iced", "Latte"}; 
        double [] price = {1.00, 1.50, 1.75, 2.00, 2.25, 2.50, 3.75};

        for ( int i = 0; i < days.length; i++)
        {
        }

        Scanner scan = new Scanner(System.in);
        System.out.println("What is the price of a Soda? ");
        price [0] = scan.nextDouble();

        System.out.println("What is the price of a Sweet Tea? ");
        price [1] = scan.nextDouble();

        System.out.println("What is the price of a Lemonade? ");
        price [2] = scan.nextDouble();

        System.out.println("What is the price of a Frozen Lemonade? ");
        price [3] = scan.nextDouble();

        System.out.println("What is the price of a Coffee-Hot? ");
        price [4] = scan.nextDouble();

        System.out.println("What is the price of a Coffee-Iced? ");
        price [5] = scan.nextDouble();

        System.out.println("What is the price of a Latte? ");
        price [6] = scan.nextDouble();
        System.out.println();

        System.out.println("Which day of the week do you want the discounted drink price for?");

        System.out.println("Weekday    Drink   Original-Price  Discount-Price");
        System.out.println("-------------------------------------------------");
    }
}

Answer 1

如果我理解正確，則您正在嘗試掃描字符串，但是您的代碼無法正常工作。 那是因為當您嘗試使用nextLine()掃描字符串時，它正在掃描上一個nextDouble()調用中的/n （換行nextDouble() 。 因此，只需執行以下操作：

System.out.println("What is the price of a Latte? ");
price[6] = scan.nextDouble(); // nextDouble() only returns the double value and leaves the '/n' character still in the buffer

scan.nextLine(); // Flushes out the left over '/n'
System.out.println("Which day of the week do you want the discounted drink price for?");
String day = scan.nextLine();

現在，將獲得您輸入的字符串，並將其分配給變量day 。