import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.*;
import javax.swing.JFormattedTextField;
import javax.swing.text.DefaultFormatterFactory;
import javax.swing.text.NumberFormatter;
 
@SuppressWarnings("empty-statement")
public class Board 
{
 
    private static final Dimension FIELD_SIZE = new Dimension(60, 60);
	private static final int EMPTY = 0;
	private JPanel grid = new JPanel();
	private JPanel[][] subgrid = new JPanel[3][3];
	private JFormattedTextField[][] cell = new JFormattedTextField[9][9];
	private static int num=0,col=9,row=9;
    private int Value=0;
    private String strValue;
 
    private int GridBoard[][] = {{0, 6, 0, 1, 0, 4, 0, 5, 0},
                          {0, 0, 8, 3, 0, 5, 6, 0, 0},
                          {2, 0, 0, 0, 0, 0, 0, 0, 1},
                          {0, 0, 6, 0, 0, 0, 3, 0, 0},
                          {7, 0, 0, 9, 0, 1, 0, 0, 4},
                          {5, 0, 0, 0, 0, 0, 0, 0, 2},
                          {0, 0, 7, 2, 0, 6, 9, 0, 0},
                          {0, 4, 0, 5, 0, 8, 0, 7, 0}};
    int GridArray[][] = null;
 
	public Board()
	{
	  grid.setBorder(BorderFactory.createLineBorder(Color.black, 3));
	  grid.setLayout(new GridLayout(3, 3));
 
	  for (int i = 0; i < subgrid.length; i++)
           {
                     for (int j = 0; j < subgrid[i].length; j++)
		 {
			 subgrid[i][j] = new JPanel(new GridLayout(3, 3));
			 subgrid[i][j].setBorder(BorderFactory.createLineBorder(Color.black, 1));
			 grid.add(subgrid[i][j]);
		 }
       }
 
	  for (int i = 0; i < cell.length; i++)
	  {
		for (int j = 0; j < cell[i].length; j++)
		{
		   cell[i][j] = new JFormattedTextField(new DefaultFormatterFactory(new NumberFormatter()));
           cell[i][j].setValue(new Integer(Value));
 
           cell[i][j].setPreferredSize(FIELD_SIZE);
	       cell[i][j].setFont( new Font("sans-serif", Font.BOLD, 20));
		   cell[i][j].setHorizontalAlignment(JFormattedTextField.CENTER);
		   subgrid[i/3][j/3].add(cell[i][j]);
	    }
	  }
	}
 
    Board(int[][] result)
    {
       this.grid =grid;
    }
    public JComponent getPanel() //return type of getPanel() is JComponent
	{
	  return grid;
	}
 
    public void setCellValue(int num, int row, int col)
	 {
        num=0;
		for (int r = 1;r<=9 ;r++ )
		  {
			for (int c = 1;c<=9 ; c++)
			{
				cell[r][c] = new JFormattedTextField();
                strValue=GridBoard.toString().replace("0", " ");
 
				String text = (num == EMPTY) ? " " : String.valueOf(num);
	            cell [r][c].setText(text);
 
		    }
          }
    }
 
   public int getCellValue(int row, int col)
    {
       int cellval=0;
       try
        {
          for (int r = 0;r<cell.length ;r++ )
		  {
			for (int c = 0;c<cell[r].length ; c++)
			{
                cellval = Integer.parseInt(cell[r][c].getText());   
			}
		  }
        }
        catch (NumberFormatException e)
        {
                cellval = EMPTY;
        }
        return cellval;
  }
 
 public void clearBoard()
 {
       for (int r = 0; r < 9 ; r++ )
		{
			for (int c = 0; c < 9 ; c++)
			{
                             cell[r][c] = new JFormattedTextField();
			}
       }
 }
 
 public static boolean isValid(boolean[] choices){
    for (int i = 1; i <= 9; i++)
    {
      if (choices[i]) return true;
    }
    return false;
  }
 
 
 protected boolean checkRow( int num )
   {
       // loop through row and check values
       for (int i = 0; i < cell[row-1].length; i++)
        {
           if(num == Integer.parseInt(cell[row-1][i].getText()));
           {
               return true;
           }
        }
       return false;
 }
 
 protected boolean checkCol( int num )
   {
       // loop through row and check values
       for (int i = 0; i < cell[col-1].length; i++)
        {
           if(num == Integer.parseInt(cell[col-1][i].getText()))
           {
               return true;
           }
        }
       return false;
   }
 
  protected boolean inBox(int number)
  {
     for(int i = 0; i < subgrid.length; i++)
      {
        for(int j = 0 ; j < subgrid[i].length; j++)
         {
           if(number == Integer.parseInt(cell[i][j].getText()))
              return true;
         }
       }
       return false;
  }
 
 private static void createAndShowGUI()
  {
	  JFrame frame = new JFrame("Sudoku");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(new Board().getPanel());
      frame.pack();
	  frame.setLocationRelativeTo(null);
	  frame.setVisible(true);
  }
 
 
 public static void main(String[] args)
  {
    Board board= new Board();
    javax.swing.SwingUtilities.invokeLater(new Runnable()
     {
       public void run()
       {
           createAndShowGUI();
       }
     });
  }
}