如何在java中返回2D字符？

public class TwoDCharArray {
    public static void main(String[] args) {
        char[][] grid = createGrid(5, 5, '*');
        printGrid(grid);
    }

    // 创建一个指定大小并填充指定字符的二维字符数组
    public static char[][] createGrid(int rows, int cols, char ch) {
        char[][] grid = new char[rows][cols];
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                grid[i][j] = ch;
            }
        }
        return grid;
    }

    // 打印二维字符数组
    public static void printGrid(char[][] grid) {
        for (int i = 0; i < grid.length; i++) {
            for (int j = 0; j < grid[i].length; j++) {
                System.out.print(grid[i][j] + " ");
            }
            System.out.println();
        }
    }
}