如何将 .txt 文件读入 java 中的二维数组？

Question

我不知道我的程序有什么问题。我想将名为“salesReport”的 .txt 文件读取到二维数组中，但它只读取一行。

二维数组有 10 行 12 列，我还需要帮助来安排打印时的数组，使之为 10 行 12 列，中间有 3 个空格。

我的文本文件

我的代码

import java.util.Scanner;  // Needed for the Scanner class
import java.io.*;  // Needed for the File class

public class salesReport
{
   public static void main(String[] args) throws IOException
   {
     
   // Create a Scanner object to read input.
      Scanner keyboard = new Scanner(System.in);
      
      int[] A;
      int[][] B;
      int i=11,j=13;
      
      A = arrayFile(121);
      
      System.out.println(A);
      
      B = showArray(i,j,A);
     
   }
   
   public static int[] arrayFile(int a) throws IOException
   {
   // Create a Scanner object to read input.
      Scanner keyboard = new Scanner(System.in);
      
      int A[];
      A = new int[a];
   
      System.out.print("Enter the filename: ");
      String filename = keyboard.nextLine();
   
      File file = new File(filename);
      Scanner inputFile = new Scanner(file);
      
      int i=0;
   
      while (inputFile.hasNextLine())
      {
         i++;
         A[i] = inputFile.nextInt();
      }
      return A;
   }
   
   public static int[][] showArray(int i,int j,int[] C) throws IOException
   {
   // Create a Scanner object to read input.
      Scanner keyboard = new Scanner(System.in);
      
      int[][] A;
      
      A = new int[i][j];
      
      for (int row = 0;row < A.length;row++)
      {
         for (int col = 0;col < A[row].length;col++)
         {
            System.out.print(A[row][col] + " ");
            System.out.println();
         }       
      }
      return A;
   }
    
}

Answer 1

这是我的尝试。我在一行中的每个元素之间放置了三个空格，在列之间放置了三个空格。

编辑： 更改打印方法以避免使用流 API。

// Needed for the File class
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Scanner; // Needed for the Scanner class

public class Read2D {
    public static void main(String[] args) throws IOException {
        int rows = 10;
        int columns = 12;

        int[] arr = arrayFile(rows * columns);
    
        int[][] md_arr = new int[rows][columns];

        for(int r=0; r < rows; r++) {
            for(int c=0; c<columns; c++) {
            md_arr[r][c] = arr[r*c+c];
            }
        }
    
        showArray(md_arr);

    }

    public static int[] arrayFile(int a) throws IOException {
        // Create a Scanner object to read input.
        Scanner keyboard = new Scanner(System.in);

        int A[];
        A = new int[a];

        System.out.print("Enter the filename: ");
        String filename = keyboard.nextLine();
        keyboard.close();

        File file = new File(filename);
        Scanner inputFile = new Scanner(file);

        int i = 0;

        while (inputFile.hasNextLine()) {
            A[i] = inputFile.nextInt();
            i++;
        }
        inputFile.close();

        return A;
    }

    public static void showArray(int[][] C) {
        for(int r=0; r < C.length; r++) {
            for(int c=0; c<C[r].length; c++) {
                System.out.print(C[r][c]+"   ");
            }
                System.out.print("\n\n\n");
        }
    
    }

}

输出：

31   74   22   5   61   84   14   86   55   22   9   81   


31   22   61   14   55   9   83   23   96   41   26   77   


31   5   14   22   83   49   41   77   84   91   73   93   


31   61   55   83   96   26   84   31   49   69   59   49   


31   84   9   49   26   3   73   36   59   35   42   98   


31   14   83   41   84   73   69   14   60   1   22   81   


31   86   23   77   31   36   14   98   85   71   60   51   


31   55   96   84   49   59   60   85   47   35   73   17   


31   22   41   91   69   35   1   71   35   53   46   6   


31   9   26   73   59   42   22   60   73   46   61   84

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