我是个编程新手，需要别人帮忙来完成我的任务。在.txt文件中有信息，它被分为5列，并有几行。它看起来像这样：
| | | | | |
| --------------|--------------|--------------|--------------|--------------|
| 橡胶|二|0.3|三点零八分|4016920000|
| 笔|三|0.3|五点零四|9608101000|
| 笔|二|0.2|二、五|9608101000|
| 铅笔|五|0.24|六、三|9609101000|
| 铅笔|三|0.18|四、八|9609101000|
第一通信是描述，第二通信是数量，第三通信是重量，第四通信是价格，第五通信是关税代码。列由空格分隔。我必须根据关税代码重新排列这些行，换句话说，我必须为每个关税代码计算数量，重量和价格。
对于这个例子，结果必须是这样的：
| | | | | |
| --------------|--------------|--------------|--------------|--------------|
| 橡胶|二|0.3|三点零八分|4016920000|
| 笔|五|0.5|七五四|9608101000|
| 铅笔|八个|0.42|11.1|9609101000|
对于我的观点，我需要创建二维数组，填充这些数据，并使计算正确的行，但我不知道如何做到。下面是我现在的代码。我将不胜感激。先谢谢你了。

import java.io.File;
import java.io.FileInputStream;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.io.IOException;
import java.util.Scanner;
import java.util.Iterator;
import java.util.ArrayList;
import java.io.FileWriter;
import java.util.Arrays;
import java.io.*;

public class Mail {
    
    public static void main(String args[]) throws Exception{
           
          File file1 = new File("C: \"Test for java input.txt\");
          if (file1.length() == 0) {  System.out.println("File is empty"); System.exit(0);}    
          FileInputStream fis = new FileInputStream(file1);
          byte[] byteArray = new byte[(int)file1.length()];
          fis.read(byteArray);
          String data = new String(byteArray);
          String[] stringArray = data.split("\r\n");
          System.out.println("Number of lines in the file are ::"+stringArray.length);
          fis.close();
          
        
          
          BufferedReader br = new BufferedReader (new FileReader ( "C: Test for java input.txt"));
          String line;
          char[][] maze = new char[stringArray.length][5];
                      
          while ((line = br.readLine() ) != null ){

                char[] row = line.toCharArray();
                    int x = 0;
                    for (int i = 0; i < row.length; i++) {
                    maze[x][i] = row[i];

                    System.out.print(maze[i]);
                    x++;
                    }
                    System.out.printf("%n");  //mention this
                }
          
          
          
          File file2 = new File("C:  "Test for java output.txt");
            int text = stringArray.length;
     
            try (PrintWriter out = new PrintWriter(file2, StandardCharsets.UTF_8))
            {
                out.print(text);
                System.out.println("Successfully written data to the file");
            } catch (IOException e) {
                e.printStackTrace();
            }

}
}

我试过了，但这是错误的。

BufferedReader br = new BufferedReader (new FileReader ( "C:Test for java input.txt"));
          String line;
          char[][] maze = new char[stringArray.length][5];
                      
          while ((line = br.readLine() ) != null ){

                char[] row = line.toCharArray();
                    int x = 0;
                    for (int i = 0; i < row.length; i++) {
                    maze[x][i] = row[i];

                    System.out.print(maze[i]);
                    x++;
                    }
                    System.out.printf("%n");  //mention this
                }