Java InputMismatchException錯誤

Question

我正在嘗試為我的Java類編寫一個清單程序。 該程序需要從.txt文件中讀取初始庫存數據（迭代一定的時間-由我們正在使用的inv.txt文件中的第一個整數定義）。 我的文本文件是正確的，掃描器，數組和循環似乎是正確的，但是我遇到了InputMismatchException。

.txt文件的格式如下：

XXXX - Count - # of times to iterate


XXXX - Product Code


XXXX -Quantity On Hand


XXXX - Reorder Level

如果每個產品重復產品代碼，QOH和重新訂購級別，則COUNT僅在文件中一次。

必須讀取所有值，並將每個值存儲在各自的數組中。

import javax.swing.*;
import java.util.*;
import java.sql.*;
import java.math.*;
import java.*;
import java.io.*;

public class Lab7Test2
{
public static void main (String [] args) throws IOException
{
  int count = 0; //To hold Max Count (Max Iterations Expected)
  int countAt = 0; //To hold Current Count.
  int number = 0; //To hold a number.
  int number2 = 0; //To hold a 2nd Number.
  int index = 0; //Index Placeholder.
  int index2 = 0;
  int index3 = 0;

  int[] partNumb;
  int[] qoh; //Holds Product's Quantity On Hand (QOH)
  int[] reorder; //Minimum Reorder Level
  int[] transNumb;
  int[] transType;
  int[] transAmt;

  String[] status; //Holds Product's Inventory Status as String.
  String[] error; //Holds Error Messages associated with Transactions.
  String input;
  String output; //Holds output for transaction Log.

  Scanner keyboard = new Scanner(System.in);
  File openFile;
  Scanner scanFile;

  //----End of Variable Declaration---    /////////////////////////////////////////////

  //----Begin Program Execution----////////////////////////////////////////////////////

  System.out.println("Enter the Inventory File Name.");
  input = keyboard.nextLine();

  if(!input.contains(".txt")) //If Input has no '.txt' extension, error message.
  {
     while(!input.contains(".txt")) //Repeat error if no '.txt' extension found.
     {
        System.out.println("Invalid Input");
        System.out.println("Enter the Inventory File Name.");
        input = keyboard.nextLine();
     }
     openFile = new File(input); //Set openFile to 'input' if '.txt' extension found.
     scanFile = new Scanner(openFile);
     System.out.println("File Loaded.");
  }
  else
  {
     openFile = new File(input); //Set openFile to 'input' if '.txt' extension found.
     scanFile = new Scanner(openFile);
     System.out.println("File Loaded.");
  }

  number = scanFile.nextInt();
  number *= 3;
  partNumb = new int[number]; //Set partNumb[] Size = to count
  qoh = new int[number]; //Set qoh[] Size = to count
  reorder = new int[number]; //Set reorder[] Size = to count
  count = number;
  number = 0;

這是引發異常的以下循環的開始，特別是向下5行：2號= scanFile.nextInt（）。 僅當我將'count'和'number'變量設置為以上的* 3時，我才出現此錯誤（以確保每個產品具有3個值：產品代碼，手動數量，訂貨量）。

 while(countAt < (count * 3)) 
  {
     if(number == 0) // Number 0 = partNumb[]
     {
        number2 = scanFile.nextInt(); 
        partNumb[index] = number;
        index++;
        number++;
        countAt++;
     }
     else if(number == 1) //Number 1 = qoh[]
     {
        number2 = scanFile.nextInt();
        qoh[index2] = number;
        index2++;
        number++;
        countAt++;
     }
     else if(number == 2) //Number 2 = reorder[]
     {
        number2 = scanFile.nextInt();
        reorder[index3] = number;
        index3++;
        number = 0;
        countAt++;
     }
  }

  System.out.println("Data Loaded to Arrays"); //Confirmation of Data Acceptance.

  //Reset all Counter & Index Variables for use with next Loop.
  index = 0;
  index2 = 0;
  index3 = 0;
  countAt = 0;
  number = 0;
  number2 = 0;


  while(countAt < (count * 3))
  {
     System.out.println(partNumb[index]); //Print All Values in the partNumb[] Array.
     index++;
     countAt++;
  }


  //----END PROGRAM -----//////////////////////////////////////////////////////////////
}

}

根據對問題的研究，至少有3天，我嘗試了無數種方法來糾正此問題，到目前為止，還沒有找到解決此InputMismatchException錯誤的任何方法？ 。 如果有人有任何建議，請讓我知道，謝謝。

堆棧跟蹤：

----jGRASP exec: java Lab7Test2

Enter the Inventory File Name.
inv.txt
File Loaded.
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:909)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextInt(Scanner.java:2160)
at java.util.Scanner.nextInt(Scanner.java:2119)
at Lab7Test2.main(Lab7Test2.java:74)

 ----jGRASP wedge2: exit code for process is 1.
 ----jGRASP: operation complete.

Answer 1

我發現您的實施中有一些小錯誤。 我嘗試用自己的列表進行嘗試，盡管我不確定是否適合您的格式。 這是我的清單：

2
1000
2  
2
1001
1
3

我對您的代碼做了一些修改，但是樣式可以輕松地更好。 但是您可以隨后執行此操作。 我注釋掉了部分實現，以便您可以輕松看到更改。

    number = scanFile.nextInt();
    //number *= 3;
    partNumb = new int[number]; // Set partNumb[] Size = to count
    qoh = new int[number]; // Set qoh[] Size = to count
    reorder = new int[number]; // Set reorder[] Size = to count
    count = number;
    number = 0;
    //while (countAt < (count * 3)) {
    while (countAt < (count * 3)) {

        //if(number == 0) // Number 0 = partNumb[]
        if (countAt%3 == 0) // Number 0 = partNumb[]
        {
            number = scanFile.nextInt();
            partNumb[index] = number;
            index++;
            //number++;
            countAt++;
            //else if(number == 1) //Number 1 = qoh[]
        } else if (countAt%3 == 1) // Number 1 = qoh[]
        {
            number = scanFile.nextInt();
            qoh[index2] = number;
            index2++;
            //number++;
            countAt++;
            //else if(number == 2) //Number 2 = reorder[]
        } else if (countAt%3 == 2) // Number 2 = reorder[]
        {
            number = scanFile.nextInt();
            reorder[index3] = number;
            index3++;
            //number = 0;
            countAt++;
        }
    }

    System.out.println("Data Loaded to Arrays"); // Confirmation of Data
                                                    // Acceptance.

    // Reset all Counter & Index Variables for use with next Loop.
    index = 0;
    index2 = 0;
    index3 = 0;
    countAt = 0;
    number = 0;
    //number2 = 0;

    //while(countAt < (count * 3))
    while (countAt < (count)) {
        System.out.println(partNumb[index]); // Print All Values in the
                                                // partNumb[] Array.
        index++;
        countAt++;
    }

    // ----END PROGRAM
    // -----//////////////////////////////////////////////////////////////
}

如果我的文件正確，測試將顯示正確的輸出：

Enter the Inventory File Name.
C:\Users\Markus\Desktop\test.txt
File Loaded.
Data Loaded to Arrays
1000
1001

希望這對您的實施有所幫助。

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