Java：你运行这个程序怎么样？

Question

我是编程新手，正在尝试自学。

我在网上找到了这个数独求解算法，但我似乎无法运行 - 我想我必须创建一个 main 方法，但我不知道在其中放入什么参数以及如何调用其他方法。

有人可以举例说明我可以做什么吗？谢谢！ :)

public class Sudoku {
  private static int mBoard[][];
  private static int mBoardSize = 9;
  private static int mBoxSize = 3;
  private boolean mRowSubset[][];
  private boolean mColSubset[][];
  private boolean mBoxSubset[][];

  public Sudoku(int board[][]) {
    mBoard = board;
    mBoardSize = mBoard.length;
    mBoxSize = (int) Math.sqrt(mBoardSize);
  }

  public void initSubsets() {
    mRowSubset = new boolean[mBoardSize][mBoardSize];
    mColSubset = new boolean[mBoardSize][mBoardSize];
    mBoxSubset = new boolean[mBoardSize][mBoardSize];
    for (int i = 0; i < mBoard.length; i++) {
      for (int j = 0; j < mBoard.length; j++) {
        int value = mBoard[i][j];
        if (value != 0) {
          setSubsetValue(i, j, value, true);
        }
      }
    }
  }

  private void setSubsetValue(int i, int j, int value, boolean present) {
    mRowSubset[i][value - 1] = present;
    mColSubset[j][value - 1] = present;
    mBoxSubset[computeBoxNo(i, j)][value - 1] = present;
  }

  public boolean solve() {
    return solve(0, 0);
  }

  public boolean solve(int i, int j) {
    if (i == mBoardSize) {
      i = 0;
      if (++j == mBoardSize) {
        return true;
      }
    }
    if (mBoard[i][j] != 0) {
      return solve(i + 1, j);
    }
    for (int value = 1; value <= mBoardSize; value++) {
      if (isValid(i, j, value)) {
        mBoard[i][j] = value;
        setSubsetValue(i, j, value, true);
        if (solve(i + 1, j)) {
          return true;
        }
        setSubsetValue(i, j, value, false);
      }
    }

    mBoard[i][j] = 0;
    return false;
  }

  private boolean isValid(int i, int j, int val) {
    val--;
    boolean isPresent = mRowSubset[i][val] || mColSubset[j][val] || mBoxSubset[computeBoxNo(i, j)][val];
    return !isPresent;
  }

  private int computeBoxNo(int i, int j) {
    int boxRow = i / mBoxSize;
    int boxCol = j / mBoxSize;
    return boxRow * mBoxSize + boxCol;
  }

  public void print() {
    for (int i = 0; i < mBoardSize; i++) {
      if (i % mBoxSize == 0) {
        System.out.println(" -----------------------");
      }
      for (int j = 0; j < mBoardSize; j++) {
        if (j % mBoxSize == 0) {
          System.out.print("| ");
        }
        System.out.print(mBoard[i][j] != 0 ? ((Object) (Integer.valueOf(mBoard[i][j]))) : " ");
        System.out.print(' ');
      }

      System.out.println("|");
    }

    System.out.println(" -----------------------");
  }

  public static void main(String[] args) {
    Sudoku sudoku = new Sudoku(mBoard);

  }
}

Answer 1

您可以尝试类似的操作（您应该更改值、大小？）：

public static void main(String[] args)
{
    //list of rows, where each row has 4 values
    int[][] board = new int[][] { {2,3,1,1}, {1,2,1,1},{2,3,3,3}, {4,2,3,3}};
    Sudoku sudoku = new Sudoku(board);
    sudoku.solve();
    sudoku.print();
}

Java：你运行这个程序怎么样？

Java: how do you run this program?

java

main

initialization

sudoku