在Java中将字符串转换为二维字符串数组

Question

我想转换字符串例如:

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

像这样的二维数组

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

我试过使用该split("")方法,但仍然没有解决方案:(

谢谢..

凯

Answer 1

    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采用正则表达式,因此元字符|需要转义.

也可以看看

• 正则表达式和转义特殊字符
• Java Arrays.equals()为二维数组返回false.
  • 使用Arrays.deepToString和Arrays.deepEquals用于多维数组

替代

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

    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]]"