我正在尝试为我的Java类编写一个Inventory程序。该程序需要从.txt文件中读取初始库存数据（迭代设定的次数 - 由我们正在使用的inv.txt文件中的第1个整数定义）。我的文本文件是正确的，扫描程序，数组和循环似乎是正确的，但我得到一个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
如果对每种产品重复产品代码，QOH和重新订购级别，则COUNT仅在文件中一次。
必须读取所有值，并且每个值都存储在各自的数组中。
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;
以下循环的开始是抛出异常，特别是5行：数字2 = scanFile.nextInt（）。当我将'count'和'number'变量设置为* 3时，我只会得到这个错误（确保每个PRODUCT都有3个值：产品代码，QUANDTITY ON HAND，REORDER LEVEL）。
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 -----//////////////////////////////////////////////////////////////
}
}
基于至少3天的研究问题，我已经尝试了无数种方法来纠正这个问题，到目前为止还没有能够提出修复此InputMismatchException错误的任何方法吗？。如果有人有任何建议，请告诉我，谢谢。
堆栈追踪：
----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.
答案 0 :(得分：0)
我在您的实施中发现了一些小错误。我用我自己的列表尝试过，虽然我不完全确定，如果它符合你的格式。 这是我的清单：
2
1000
2
2
1001
1
3
我稍微调整了你的代码，但风格可以更好。但是之后你可以这样做。我评论了部分实现，以便您可以轻松查看更改。
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
// -----//////////////////////////////////////////////////////////////
}
如果我的文件正确，测试显示正确的输出：
Enter the Inventory File Name.
C:\Users\Markus\Desktop\test.txt
File Loaded.
Data Loaded to Arrays
1000
1001
我希望这可以帮助您实施。
此致
最高