Java中将字符串转换为二维字符串数组 [英] Convert string into two dimensional string array in Java

问题描述

我喜欢转换字符串，例如:

I like to convert string for example :

String data = "1|apple,2|ball,3|cat";

变成这样的二维数组

{{1,apple},{2,ball},{3,cat}}

我已经尝试使用 split("") 方法，但仍然没有解决方案:(

I have tried using the split("") method but still no solution :(

谢谢..

凯

推荐答案

    String data = "1|apple,2|ball,3|cat";
    String[] rows = data.split(",");

    String[][] matrix = new String[rows.length][]; 
    int r = 0;
    for (String row : rows) {
        matrix[r++] = row.split("\\|");
    }

    System.out.println(matrix[1][1]);
    // prints "ball"

    System.out.println(Arrays.deepToString(matrix));
    // prints "[[1, apple], [2, ball], [3, cat]]"

非常简单，除了 String.split 需要正则表达式，所以元字符 | 需要转义.

Pretty straightforward except that String.split takes regex, so metacharacter | needs escaping.

• 正则表达式和转义特殊字符
• Java Arrays.equals() 为两个返回 false维数组.
  • 对多维数组使用 Arrays.deepToString 和 Arrays.deepEquals

  如果您知道将有多少行和列，您可以预先分配一个 String[][] 并使用一个 Scanner 如下:

  If you know how many rows and columns there will be, you can pre-allocate a String[][] and use a Scanner as follows:

      Scanner sc = new Scanner(data).useDelimiter("[,|]");
      final int M = 3;
      final int N = 2;
      String[][] matrix = new String[M][N];
      for (int r = 0; r < M; r++) {
          for (int c = 0; c < N; c++) {
              matrix[r][c] = sc.next();
          }
      }
      System.out.println(Arrays.deepToString(matrix));
      // prints "[[1, apple], [2, ball], [3, cat]]"
  

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