Question

我的程序应该要求某人输入序列号和对象的价格。

这是类驱动程序

import java.io.*;
import java.util.Scanner;

public class InventoryDriver {
    public static void main(String[] args)throws IOException {
        Inventory storeItem = new Inventory(" ", 1);
        PrintWriter storeFile = new PrintWriter("StoreInventory.txt");
        Scanner scan = new Scanner(System.in);
        boolean running = true;

        String itemNum = " ";
        double originalPrice = 1;

        while (running) {

            System.out.println("Enter the item number or enter 0 when you are done.");
            itemNum = scan.nextLine();

            storeItem.setItemNum(itemNum);

            storeFile.println(itemNum);

            if(itemNum.equals("0")) break;


            System.out.println("Enter the original price or enter 0 when you are done.");
            originalPrice = scan.nextDouble();

            storeItem.setOriginalPrice(originalPrice);

            storeFile.println(originalPrice);

            if(originalPrice == 0) break;
        }

        //create a scanner variable named myFile
        Scanner myFile = new Scanner(new File("StoreInventory.txt"));

        //Read my data from my file into the variablles
        //itemNum = myFile.nextLine();
        //originalPrice = myFile.nextDouble();

        printSaleData(myFile, storeItem);

        //Close the file
        myFile.close();
        storeFile.close();
    }
}

第一次使用此输出完美工作后

    Enter the item number or enter 0 when you are done.
    input

    Enter the original price or enter 0 when you are done.
    input

但是当循环返回时，它会打印出这个

    Enter the item number or enter 0 when you are done.
    input

    Enter the original price or enter 0 when you are done.
    input

    Enter the item number or enter 0 when you are done.
    Enter the original price or enter 0 when you are done.
    input

我的代码在第一次运行后如何更改循环？附：即使我打破了循环，整个程序也会停止，并且不会调用＆＃34; printSaleData＆＃34;子模块到主模块。

Answer 1

将scan.nextLine更新为scan.next（）。这样就可以了。

虽然循环在第一次迭代后跳过第一个输入扫描器？

1 个答案: