用java实现两个间隔数据的获取和计算

Question

我的问题是，我想输入两个用空格隔开的数字，得到这两个数字，然后计算这两个数字。例如，我输入了“10 20”，它们被一个空格隔开，然后我想获得并计算它们为分开的:10*20=200..

import java.util.*;

public class LabExer2
{
    private String itemName;
    private double itemPrice;
    private int itemQuantity;
    private double amountDue;

    public void setItemName(String newItemName)
    {
        itemName = newItemName;
    }

    public String getItemName()
    {
        return itemName;
    }

    public void setTotalCost(int quantity, double price)
    {
        itemQuantity = quantity;
        itemPrice = price;

        amountDue = itemQuantity * itemPrice;
    }

    public double getTotalCost()
    {
        return amountDue;
    }

    public void readInput()
    {
        Scanner s = new Scanner(System.in);

        System.out.println("Enter the name of the item you are purchasing.");
        itemName = s.nextLine();
        System.out.println("Enter the quantity and price separated by a space.");
        //itemQuantity = s.nextInt();
        //itemPrice = s.nextDouble();

    }

    public void writeInput()
    {
        System.out.println("You are purchasing " + itemQuantity + " " + itemName + "(s) at " + itemPrice + " each.");
        System.out.println("Amount due is " + getTotalCost());
    }
}

public class MainLabExer2
{
    public static void main(String[]args)
    {
        LabExer2 le = new LabExer2();
        //still not finished because I can't figure out the process in the other class.
    }
}

我想得到3和15.50并计算。我不知道该用什么什么，我只是一个Java初学者。

Answer 1

您可以创建两个提示，一个用于接受ItemQuantityint值，另一个用于接受ItemPriceDouble值。

但是，如果希望用户同时输入这两个值，则需要在readInput（）方法中编写一段代码，该代码将提取ItemQuantity值和ItemPrice值。

试试这个：

public void readInput() {
    Scanner s = new Scanner(System.in);

    System.out.println("Enter the name of the item you are purchasing.");
    itemName = s.nextLine();
    System.out.println("Enter the quantity and price separated by a space.");
    String userInput = s.nextLine(); //String to collect user input

    //code to loop through String in search for Whitespace
    for (int x=0; x<String.length(); x++) {
        if (userInput.charAt(x) == ' ') {
            //whitespace found, set itemQuantity to a substring 
            //from the first char in UserInput to the char before whitespace
            itemQuantity = Integer.parseInt(userInput.substring(0, x-1)); 
            //convert String to int
            itemPrice = Integer.parseInt(userInput.substring(x+1, userInput.length()));
            x = String.length();
        } else {
            itemQuantity = Integer.parseInt(userInput);
        }
    }
}

如果我的代码格式不正确，请原谅，我是新来的。