阵列文件IO项目已编译但无法运行。获取java.lang.NumberFormatError解决方案？

由于这个错误，我不确定是否还有其他方法可以工作。我正在读取txt文件customerOrders.txt，并试图统计每个客户的产品订单。显示方法尚未完成，但格式不应成为问题。如何通过此java.lang.NumberFormatError？我是不是错过了什么

txt文件包括：

1,First1,Last1,3
101,Product1,1,2000.00
102,Product2,3,500.00
103,Product3,1,1000.00
2,First2,Last2,2
102,Product2,3,500.00
103,Product3,1,1000.00
3,First3,Last3,1
104,Product4,1,1500.00
4,First4,Last4,4
101,Product1,1,2000.00
102,Product2,3,500.00
103,Product3,1,1000.00
104,Product4,1,1500.00
5,First5,Last5,1
101,Product1,2,2000.00

第行出现错误： productCount=Integer.parseInt fin.nextLine

import java.util.ArrayList;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
/**
 * 
 */
public class Main
{
    // TODO: declare the ArrayList of Customer objects.
    private static ArrayList<Customer> customer = new ArrayList<>();



public static void main(String[] args) 
{
    // read the customer and order records from the file.
    populateCustomersFromFile("customerOrders.txt");

    // display total number of orders and total amount owed.
    displayOrderSummary();

    // display each customer and their orders
    displayCustomerOrders();

    // write the customer and order details to the file.
    writeCustomersToFile("customerOrdersOut.txt");
}

// TODO: implement the populateCustomersFromFile method.
public static void populateCustomersFromFile(String filename){
    try ( Scanner fin = new Scanner(new File(filename) ) ) {
        String record;
        String[] fields; 
        String[] productFields;
        ProductOrder[] productOrder;

        int productCount;
        while ( fin.hasNext() ) {
            record = fin.nextLine();
            fields = record.split(",");

            productCount = Integer.parseInt( fin.nextLine());
            productOrder = new ProductOrder[productCount];

            for ( int product = 1; product <= productCount; product++) {
                record = fin.nextLine();
                productFields = record.split(",");

                productOrder[product - 1] = new ProductOrder(productFields[0],
                                                             productFields[1],
                                                             Integer.parseInt(productFields[2]),
                                                             Double.parseDouble(productFields[3]));
            }

            customer.add( new Customer (fields[0],
                                       fields[1],
                                       fields[2],
                                       Integer.parseInt(fields[3]),
                                       productOrder)
                                       );



        }
    }catch (FileNotFoundException e) {
        System.err.println("Error: Unable to find file: ");
        System.exit(1);
    }
}

// TODO: implement the displayOrderSummary method. See screen cast in README file for output.
public static void displayOrderSummary(){
    System.out.println("Order Summary:");
    System.out.println("----------------");
    for (Customer c : customer){
        System.out.println("Orders: " + c);
    }
}

// TODO: implement the displayCustomerOrders method. See screen cast in README file for output.
public static void displayCustomerOrders(){
    System.out.println("Customer Orders:");
    System.out.println("----------------");

}

// TODO: implement the writeCustomersToFile method. See customerOrdersOut.txt for format.
public static void writeCustomersToFile(String filename) {
    try ( PrintWriter pw = new PrintWriter(filename) ) {
        for (Customer c : customer) {
            pw.println(c.getCid() + "," + 
                       c.getFirst() + "," + 
                       c.getLast() + "," + 
                       c.getNumberOfOrders());

            pw.println( c.getProductOrder().length );           

            for ( ProductOrder po : c.getProductOrder() ) {
                pw.println( po.getPid() + "," +
                            po.getDescription() + "," +
                            po.getQty() + "," +
                            po.getCost() );
            }
        }

    } catch (FileNotFoundException e) {
        System.err.println("Error - unable to write to file.");
        System.exit(1);
    }
}
}

排队

productCount = Integer.parseInt( fin.nextLine());

您试图将整行解析为整数，这显然行不通。在此之前，您已将行拆分为字段。你应该在分析

productCount = Integer.parseInt(fields[0]);

---

如果不显示导致错误的输入数据，任何人都无法帮助您。oops 1秒customerOrders.txt是1，First1，Last1,3 101，Product1，12000.00 102，Product2，3500.00 103，Product3，11000.00 2，First2，Last2,2 102，Product2，3500.00 103，Product3，11000.00 3，Last3,1 104，Product4，11500.00 4，First4，Last4,4 101，Product1，12000.00 102，Product2，3500.00 103，Product3，11000.00 104，Product4，11500.00 5，First5，Last5,1 101，Product1，22000.00行productCount=Integer.parseInt fin.nextLine出现错误；希望这有帮助。显示产生错误的输入数据。不，你的帖子并将数据包含在那里，而不是在评论中。对不起，对该网站来说真的很新。有没有办法添加txt文件本身或只是把它放在文本中？谢谢！这解决了这个问题。你介意解决另一个问题吗？很抱歉，解析对我来说是新的。Integer.parseIntproductFields[2]现在出现错误，这在for循环中，是文本文件中的字符串Last2，应计为整数