使用java代码，实现数独。需要根据9X9盘面上的已知数字，推算出所有剩余空格的数字，并且满足每一行、每一列、每一个3X3粗线宫内的数字均含1-9，并且不重复。

以下是一个使用Java代码实现数独的示例：

public class SudokuSolver {
    private int[][] board;

    public SudokuSolver(int[][] board) {
        this.board = board;
    }

    public boolean solve() {
        for (int row = 0; row < 9; row++) {
            for (int col = 0; col < 9; col++) {
                if (board[row][col] == 0) {
                    for (int num = 1; num <= 9; num++) {
                        if (isValid(row, col, num)) {
                            board[row][col] = num;
                            if (solve()) {
                                return true;
                            } else {
                                board[row][col] = 0;
                            }
                        }
                    }
                    return false;
                }
            }
        }
        return true;
    }

    private boolean isValid(int row, int col, int num) {
        for (int i = 0; i < 9; i++) {
            if (board[row][i] == num || board[i][col] == num) {
                return false;
            }
        }
        int boxRow = row - row % 3;
        int boxCol = col - col % 3;
        for (int i = boxRow; i < boxRow + 3; i++) {
            for (int j = boxCol; j < boxCol + 3; j++) {
                if (board[i][j] == num) {
                    return false;
                }
            }
        }
        return true;
    }

    public void print() {
        for (int row = 0; row < 9; row++) {
            for (int col = 0; col < 9; col++) {
                System.out.print(board[row][col] + " ");
            }
            System.out.println();
        }
    }
}

你可以使用以下代码来测试：

public static void main(String[] args) {
    int[][] board = {
            {5, 3, 0, 0, 7, 0, 0, 0, 0},
            {6, 0, 0, 1, 9, 5, 0, 0, 0},
            {0, 9, 8, 0, 0, 0, 0, 6, 0},
            {8, 0, 0, 0, 6, 0, 0, 0, 3},
            {4, 0, 0, 8, 0, 3, 0, 0, 1},
            {7, 0, 0, 0, 2, 0, 0, 0, 6},
            {0, 6, 0, 0, 0, 0, 2, 8, 0},
            {0, 0, 0, 4, 1, 9, 0, 0, 5},
            {0, 0, 0, 0, 8, 0, 0, 7, 9}
    };
    SudokuSolver solver = new SudokuSolver(board);
    if (solver.solve()) {
        solver.print();
    } else {
        System.out.println("No solution found.");
    }
}

输出结果应该是：

5 3 4 6 7 8 9 1 2 
6 7 2 1 9 5 3 4 8 
1 9 8 3 4 2 5 6 7 
8 5 9 7 6 1 4 2 3 
4 2 6 8 5 3 7 9 1 
7 1 3 9 2 4 8 5 6 
9 6 1 5 3 7 2 8 4 
2 8 7 4 1 9 6 3 5 
3 4 5 2 8 6 1 7 9