使用 StringTokenizer 将 .txt 文件转换为二维数组

Question

文本文件（twodimension8.txt）。第一行是由','

分隔的行和列

4,6
1,2,3,4,5,6
23,55,34,89,41,72
9,27,19,56,33,82
3,65,21,66,85,11

到目前为止我的代码。使用 TextFileInput class 从文件中读取

import java.util.*;

public class Tokens {
   public static TextFileInput myFile;
   public static StringTokenizer myTokens;
   public static int[][] twodimarr;
   public static String line;
   
 
   public static void main(String[] args) {

      myFile = new TextFileInput("twodimension8.txt");
      line = myFile.readLine();
      System.out.println("The input line is "+line);

      myTokens = new StringTokenizer(line,",");

      int row = Integer.parseInt(myTokens.nextToken());
      int col = Integer.parseInt(myTokens.nextToken());

      twodimarr = new int[row][col];

      for (int i = 0; i < row; i++) {
          line = myFile.readLine();
          for (int j = 0; j < col; j++) {
             myTokens = new StringTokenizer(line, ",");
             twodimarr[i][j] = Integer.parseInt(myTokens.nextToken());
          }
      }

      for (int i=0; i<row; i++) {
          for (int j=0; j<col;j++)
             System.out.print(twodimarr[i][j]);
          System.out.println();
    }
         
   } //main
}

输出：

111111   
232323232323
999999     
333333

问题似乎出在 for 循环中，它试图将它添加到二维数组中。我不确定如何解决这个问题。

Answer 1

实际的错误在这个块中：

      for (int i = 0; i < row; i++) {
          line = myFile.readLine();
          for (int j = 0; j < col; j++) {
             myTokens = new StringTokenizer(line, ",");
             twodimarr[i][j] = Integer.parseInt(myTokens.nextToken());
          }
      }

myTokens 每行只能重新分配一次，而不是每个单独的数字。因此，改为将该位更改为：

      for (int i = 0; i < row; i++) {
          line = myFile.readLine();
          myTokens = new StringTokenizer(line, ",");
          for (int j = 0; j < col; j++) {
             twodimarr[i][j] = Integer.parseInt(myTokens.nextToken());
          }
      }

此外，将局部变量存储为静态 class 变量不是好的做法。而不是做 public static TextFileInput myFile; 在 class 定义的开头，在 main 的顶部执行 TextFileInput myFile = new TextFileInput("twodimension8.txt");。（其他变量相同）。

Answer 2

解决我上面提到的问题：

    public static int[][] loadArray(String path) throws IOException {
        int[][] result = null;
        try (Scanner s = new Scanner(new File(path))) {
            s.useDelimiter("[,\r\n]");
            int numRows = s.nextInt();
            int numCols = s.nextInt();
            result = new int[numRows][numCols];
            for (int row = 0; row < numRows; row++) {
                for (int col = 0; col < numCols; col++) {
                    result[row][col] = s.nextInt();
                }
            }
            return result;
        }
    }

使用 StringTokenizer 将 .txt 文件转换为二维数组

Using StringTokenizer to convert a .txt file into a 2d array

java

tokenize

multidimensional-array