用java代码生成数独题目完整代码

以下是一个简单的 Java 代码示例，用于生成数独题目：

import java.util.Random;

public class SudokuGenerator {

    private static final int BOARD_SIZE = 9;
    private static final int SUBSECTION_SIZE = 3;

    private final int[][] board;
    private final Random random;

    public SudokuGenerator() {
        this.board = new int[BOARD_SIZE][BOARD_SIZE];
        this.random = new Random();
    }

    public int[][] generate() {
        generate(0, 0);
        return board;
    }

    private boolean generate(int row, int col) {
        if (col == BOARD_SIZE) {
            col = 0;
            row++;
            if (row == BOARD_SIZE) {
                return true;
            }
        }

        if (board[row][col] != 0) {
            return generate(row, col + 1);
        }

        int[] values = getShuffledValues();
        for (int value : values) {
            if (isValid(row, col, value)) {
                board[row][col] = value;
                if (generate(row, col + 1)) {
                    return true;
                }
            }
        }

        board[row][col] = 0;
        return false;
    }

    private int[] getShuffledValues() {
        int[] values = new int[BOARD_SIZE];
        for (int i = 0; i < BOARD_SIZE; i++) {
            values[i] = i + 1;
        }
        for (int i = 0; i < BOARD_SIZE; i++) {
            int randomIndex = random.nextInt(BOARD_SIZE);
            int temp = values[i];
            values[i] = values[randomIndex];
            values[randomIndex] = temp;
        }
        return values;
    }

    private boolean isValid(int row, int col, int value) {
        for (int i = 0; i < BOARD_SIZE; i++) {
            if (board[row][i] == value || board[i][col] == value) {
                return false;
            }
        }

        int subsectionRow = (row / SUBSECTION_SIZE) * SUBSECTION_SIZE;
        int subsectionCol = (col / SUBSECTION_SIZE) * SUBSECTION_SIZE;

        for (int i = 0; i < SUBSECTION_SIZE; i++) {
            for (int j = 0; j < SUBSECTION_SIZE; j++) {
                if (board[subsectionRow + i][subsectionCol + j] == value) {
                    return false;
                }
            }
        }

        return true;
    }
}

这个类包含一个 `generate()` 方法，它将返回一个二维数组，其中包含生成的完整数独问题的值。请注意，此代码不包括任何用户界面或其他交互性，因此您可能需要将其与其他代码结合使用才能创建完整的应用程序。