java - Java中使用scanner方法进行简单计算

Question

我正在尝试创建一个简单的程序，要求用户输入三个商品、它们的数量和价格。程序必须允许项目名称包含空格。这是我迄今为止编写的代码。

   import java.util.Scanner;
   public class AssignmentOne {

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

   //       System.out.printf("$%4.2f for each %s ", price, item);
   //       System.out.printf("\nThe total is: $%4.2f ", total);

    //process for item one
    System.out.println("Please enter in your first item");
    String item = kb.nextLine();
    System.out.println("Please enter the quantity for this item");
    int quantity = kb.nextInt();
    System.out.println("Please enter in the price of your item");
    double price = kb.nextDouble();




    //process for item two
    System.out.println("\nPlease enter in your second item");
    String item2 = kb.nextLine();
    System.out.println("\nPlease enter the quantity for this item");
    int quantity2 = kb.nextInt();
    System.out.print("\nPlease enter in the price of your item");
    double price2 = kb.nextDouble();
    double total2 = quantity2*price2;
   //       System.out.printf("$%4.2f for each %s ", price2, item2);
   //       System.out.printf("\nThe total is: $%4.2f ", total2);

    //process for item three
    System.out.println("\nPlease enter in your third item");
    String item3 = kb.nextLine();
    System.out.println("Please enter the quantity for this item");
    int quantity3 = kb.nextInt();
    System.out.println("Please enter in the price of your item");
    double price3 = kb.nextDouble();
    double total3 = quantity3*price3;
   //       System.out.printf("$%4.2f for each %s ", price3, item3);
   //       System.out.printf("\nThe total is: $%4.2f ", total3);


    double total = quantity*price;

    double grandTotal = total + total2 + total3;
    double salesTax = grandTotal*(.0625);
    double grandTotalTaxed = grandTotal + salesTax;


    String amount = "Quantity";
    String amount1 = "Price";
    String amount2 = "Total";
    String taxSign = "%";

    System.out.printf("\nYour bill: ");
    System.out.printf("\n\nItem");
    System.out.printf("%30s", amount);
   //       System.out.printf("\n%s %25d %16.2f %11.2f", item, quantity, price, total);
   //       System.out.printf("\n%s %25d %16.2f %11.2f", item2,quantity2, price2, total2);
   //       System.out.printf("\n%s %25d %16.2f %11.2f", item3,quantity3, price3, total3);

    System.out.printf("\n%30s", item);
    System.out.printf("%30d", quantity);
    System.out.printf("\n%30s", item2);
    System.out.printf("\n%30s", item3);



    System.out.printf("\n\n\nSubtotal %47.2f", grandTotal);
    System.out.printf("\n6.25 %s sales tax %39.2f", taxSign, salesTax);
    System.out.printf("\nTotal %50.2f", grandTotalTaxed);



}

}

我的问题是，当我使用 String item = kb.nextLine(); 时这是输入项目时此过程的示例

   Please enter in your first item
   soda

   Please enter the quantity for this item
   10

   Please enter the price for this item
   15

   Please enter in your second item
   Please enter the quantity for this item

此时第一个项目很好，但后来到了第二个项目，它自动输入第二个项目行并直接移动到数量，我不明白如何解决这个问题，我需要使用下一行()；所以项目名称可以有空格。请帮忙。

Answer 1

试试这个代码

  import java.util.Scanner;
  class AssignmentOne {

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

   //       System.out.printf("$%4.2f for each %s ", price, item);
   //       System.out.printf("\nThe total is: $%4.2f ", total);

    //process for item one
    System.out.println("Please enter in your first item");
    String item = kb.nextLine();
    System.out.println("Please enter the quantity for this item");
    int quantity = Integer.parseInt(kb.nextLine());
    System.out.println("Please enter in the price of your item");
    double price = Double.parseDouble(kb.nextLine());




    //process for item two
    System.out.println("\nPlease enter in your second item");
    String item2 = kb.nextLine();
    System.out.println("\nPlease enter the quantity for this item");
    int quantity2 = Integer.parseInt(kb.nextLine());
    System.out.print("\nPlease enter in the price of your item");
    double price2 =Double.parseDouble( kb.nextLine());
    double total2 = quantity2*price2;
   //       System.out.printf("$%4.2f for each %s ", price2, item2);
   //       System.out.printf("\nThe total is: $%4.2f ", total2);

    //process for item three
    System.out.println("\nPlease enter in your third item");
    String item3 = kb.nextLine();
    System.out.println("Please enter the quantity for this item");
    int quantity3 = Integer.parseInt(kb.nextLine());
    System.out.println("Please enter in the price of your item");
    double price3 = Double.parseDouble(kb.nextLine());
    double total3 = quantity3*price3;
   //       System.out.printf("$%4.2f for each %s ", price3, item3);
   //       System.out.printf("\nThe total is: $%4.2f ", total3);


    double total = quantity*price;

    double grandTotal = total + total2 + total3;
    double salesTax = grandTotal*(.0625);
    double grandTotalTaxed = grandTotal + salesTax;


    String amount = "Quantity";
    String amount1 = "Price";
    String amount2 = "Total";
    String taxSign = "%";

    System.out.printf("\nYour bill: ");
    System.out.printf("\n\nItem");
    System.out.printf("%30s", amount);
   //       System.out.printf("\n%s %25d %16.2f %11.2f", item, quantity, price, total);
   //       System.out.printf("\n%s %25d %16.2f %11.2f", item2,quantity2, price2, total2);
   //       System.out.printf("\n%s %25d %16.2f %11.2f", item3,quantity3, price3, total3);

    System.out.printf("\n%30s", item);
    System.out.printf("%30d", quantity);
    System.out.printf("\n%30s", item2);
    System.out.printf("\n%30s", item3);



    System.out.printf("\n\n\nSubtotal %47.2f", grandTotal);
    System.out.printf("\n6.25 %s sales tax %39.2f", taxSign, salesTax);
    System.out.printf("\nTotal %50.2f", grandTotalTaxed);



}
}