Java 数独正确输入数字

Question

这是我的数独游戏的代码。它将接受空白单元格的输入，但由于某种原因，它不会改变颜色来指示输入是对还是错。任何建议将不胜感激。

import java.awt.*;     
import java.awt.event.*;
import java.util.concurrent.TimeUnit;

import javax.swing.*;     


public class Sudoku extends JFrame 
{
  long starttime = System.currentTimeMillis();
  public static final int gridDim = 9;//board size
  public static final int subGridDim = 3; //sub grid size
  public static final int cellSize = 60;
  public static final int width  = 630;
  public static final int height = 630;
  public static final Color emptyCell= Color.blue;
  public static final Color correct = new Color(0, 255, 0);
  public static final Color incorrect = Color.RED;
  public static final Color backgroundColor = new Color(240, 240, 240); 
  public static final Color backgroundColorColor = Color.BLACK;
  public static final Font fontColor = new Font("Times New Roman", Font.PLAIN, 20);

  private JTextField[][] tfCells = new JTextField[9][9];

  String x;
  int y;
  private int[][] puzzle = {{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}};

  private boolean[][] masks = {{true, false, false, false, false, true, false, false, false},
            {false, true, false, true, false, false, false, false, true},
            {true, false, false, false, false, false, false, false, false},
            {true, false, false, false, true, true, false, false, false},
            {false, false, false, false, false, false, false, false, false},
            {false, false, false, true, false, true, false, false, false},
            {true, true, false, false, false, false, false, false, false},
            {false, false, false, true, false, false, false, false, false},
            {true, false, true, false, false, true, false, false, false}};

  public Sudoku() 
  {
    Container cp = getContentPane();
    cp.setLayout(new GridLayout(9,9));
    InputListener listener = new InputListener();

    for (int row = 0; row < gridDim; ++row) //build 9x9 text fields
    {
      for (int col = 0; col < gridDim; ++col) 
      {
        tfCells[row][col] = new JTextField(); 
        cp.add(tfCells[row][col]);
        if (masks[row][col]) //if empty cell
        {
          tfCells[row][col].setText("");
          tfCells[row][col].setEditable(true);
          tfCells[row][col].setBackground(correct);
          tfCells[row][col].addActionListener(listener);  
        } 
        else //if cell is filled
        {
          tfCells[row][col].setText(puzzle[row][col] + "");
          tfCells[row][col].setEditable(false);
          tfCells[row][col].setBackground(backgroundColorColor);
          tfCells[row][col].setForeground(backgroundColor);
        }

        tfCells[row][col].setHorizontalAlignment(JTextField.CENTER); // fix cells
        tfCells[row][col].setFont(fontColor);
      }
    }
    cp.setPreferredSize(new Dimension(width, height)); //set window size
    pack();

    setTitle("Sudoku");
    setVisible(true);
  }
  public static void main(String[] args) 
  {
    Sudoku app = new Sudoku();
    app.setDefaultCloseOperation(EXIT_ON_CLOSE);
  }
  private class InputListener implements ActionListener 
  {
    @Override
    public void actionPerformed(ActionEvent e) 
    {
      int rowSelected = -1; //determines which row/column is being looked at
      int colSelected = -1;
      JTextField source = (JTextField)e.getSource();
      boolean found = false; 
      for (int row = 0; row < gridDim && !found; ++row)// Scan fields for all rows and columns +
                                                            //match with the source object
      {
        for (int col = 0; col < gridDim && !found; ++col) 
        {
          if (tfCells[row][col] == source)
          {
            rowSelected = row;
            colSelected = col;
            found = true;  // break the inner/outer loops
          }
        }
      }
      x = tfCells[rowSelected][colSelected].getText(); //get input
      y = Integer.parseInt(x);
      if(y==puzzle[rowSelected][colSelected])
      {
        tfCells[rowSelected][colSelected].setBackground(Color.green);
      }
      else
        tfCells[rowSelected][colSelected].setBackground(Color.red);

      if(masks[rowSelected][colSelected])//if all answers are correct
      {
        long endtime = System.currentTimeMillis();
        long timeSeconds = TimeUnit.MILLISECONDS.toSeconds(endtime - starttime); // time in seconds
        JOptionPane.showMessageDialog(null, "Finished in: " + timeSeconds);
      }
    }
  }
}

Answer 1

当您尝试 y = Integer.parseInt(x);

时，您将获得 NumberFormatException

要解决此问题，请添加一个 catch，它将 actionPerformed 中的方框设置为红色。

x = tfCells[rowSelected][colSelected].getText(); //get input
try {
    y = Integer.parseInt(x);
    System.out.println(y);
    if(y==puzzle[rowSelected][colSelected]) {
         tfCells[rowSelected][colSelected].setBackground(Color.green);
    } else {
         tfCells[rowSelected][colSelected].setBackground(Color.red);
    }
    if(masks[rowSelected][colSelected]) { //if all answers are correct
         long endtime = System.currentTimeMillis();
         long timeSeconds = TimeUnit.MILLISECONDS.toSeconds(endtime - starttime); // time in seconds
         JOptionPane.showMessageDialog(null, "Finished in: " + timeSeconds);
    }
} catch (NumberFormatException exc){
    tfCells[rowSelected][colSelected].setBackground(Color.red);
}

Java 数独正确输入数字

Java Sudoku correct number input

java

sudoku