Stringbuilder 到 2D 数组 Java

Question

我正在做一个学校项目，但在将 Stringbuilder 转换为 2D 数组时遇到了一些麻烦。

stringbuilder sb 包含一个 2D 矩阵，我想将其转换为 2D int。

0 1 1 1 0 0 0 0 
1 0 0 0 0 0 0 0 
1 0 0 0 0 0 0 0 
1 0 0 0 1 0 1 0
0 0 0 1 0 1 0 0 
0 0 0 0 1 0 0 0 
0 0 0 1 0 0 0 1 
0 0 0 0 0 0 1 0 

这是我要转换为 int[][] 的 sb 中的矩阵。

有什么想法吗？

Answer 1

试试这个（解释在代码中）

public static void main(String[] args) {
    //assuming the stringbuilder has the contents below (each line ending in space followed by a newline character)
    final StringBuilder sb = new StringBuilder();
    sb.append("0 1 1 1 0 0 0 0 \n");
    sb.append("1 0 0 0 0 0 0 0 \n");
    sb.append("1 0 0 0 0 0 0 0 \n");
    sb.append("1 0 0 0 1 0 1 0 \n");
    sb.append("0 0 0 1 0 1 0 0 \n");
    sb.append("0 0 0 0 1 0 0 0 \n");
    sb.append("0 0 0 1 0 0 0 1 \n");
    sb.append("0 0 0 0 0 0 1 0 \n");

    //extract each line from the sb by splitting after the newline character \n
    final String[] rows = sb.toString().split("\n");
    //each line represent a row, so the numbers of lines is the number of rows in our matrix
    final int totalRows = rows.length;
    //the lenght of each line, if we replace space with nothing, represents the number of columns
    //columns have the same number of elements for each line so we can read it from the first row, row[0]. it will be the same for all the others 
    final int totalColumns = rows[0].replace(" ", "").length();
    //create matrix with proper size
    final int[][] matrix = new int[totalRows][totalColumns];

    //initialize first row index
    int currentRow = 0;
    //initialize first column index
    int currentColumn = 0;

    for (String row : rows) { //for each row
        row = row.substring(0, row.length() - 1); //remove last space character
        final String[] elements = row.split(" "); //store each element of the row in an array by splitting after the space character
        for (final String element : elements) { //for each element
            //add element in matrix at correct position
            matrix[currentRow][currentColumn] = Integer.parseInt(element); //convert string to int
            //increment column count for the next element
            currentColumn++;
        }
        //increment row count for the next row
        currentRow++;
        //reset column counter for the next row
        currentColumn = 0;
    }

    //display the matrix
    for (int i = 0; i < totalRows; i++) {
        for (int j = 0; j < totalColumns; j++) {
            if (j == 7) {
                //if last column add a newline after the element
                System.out.print(matrix[i][j] + "\r\n"); // where \r\n = CarriageReturn + LineFeed and is used as a new line character in Windows
                //or simply replace the above line with System.out.println(matrix[i][j]);
            } else {
                //if not last column add just a space after the element
                System.out.print(matrix[i][j] + " ");
            }
        }
    }
}