What am asking for is a modification so that when the game is completed with the right numbers, a congratulatory message will appear. other wise how will you know if you won the game? The next modification is a RETRY button incase you want to retry the game. am not only asking for a retry button but a congratulatory message as well. thank you.

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

 

public class Sudoku2 extends JFrame {

  public static final int GRID_SIZE = 9;

  public static final int SUBGRID_SIZE = 3;

  public static final int CELL_SIZE = 60;

  public static final int CANVAS_WIDTH = CELL_SIZE * GRID_SIZE;

  public static final int CANVAS_HEIGHT = CELL_SIZE * GRID_SIZE;

  public static final Color OPEN_CELL_BGCOLOR = Color.ORANGE;

  public static final Color OPEN_CELL_TEXT_YES = new Color(0, 255, 0);

  public static final Color OPEN_CELL_TEXT_NO = Color.BLUE;

  public static final Color CLOSED_CELL_BGCOLOR = new Color(240, 240, 240);

  public static final Color CLOSED_CELL_TEXT = Color.RED;

  public static final Font FONT_NUMBERS = new Font("Monospaced", Font.BOLD, 20);

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

  private int[][] puzzle1 =

{{4, 3, 5, 2, 6, 9, 7, 8, 1},

  {6, 8, 2, 5, 7, 1, 4, 9, 3},

  {1, 9, 7, 8, 3, 4, 5, 6, 2},

  {8, 2, 6, 1, 9, 5, 3, 4, 7},

  {3, 7, 4, 6, 8, 2, 9, 1, 5},

  {9, 5, 1, 7, 4, 3, 6, 2, 8},

  {5, 1, 9, 3, 2, 6, 8, 7, 4},

  {2, 4, 8, 9, 5, 7, 1, 3, 6},

  {7, 6, 3, 4, 1, 8, 2, 5, 9}};

  private int[][] puzzle2 =

{{1, 5, 2, 4, 8, 9, 3, 7, 6},

  {7, 3, 9, 2, 5, 6, 8, 4, 1},

  {4, 6, 8, 3, 7, 1, 2, 9, 5},

  {3, 8, 7, 1, 2, 4, 6, 5, 9},

  {5, 9, 1, 7, 6, 3, 4, 2, 8},

  {2, 4, 6, 8, 9, 5, 7, 1, 3},

  {9, 1, 4, 6, 3, 7, 5, 8, 2},

  {6, 2, 5, 9, 4, 8, 1, 3, 7},

  {8, 7, 3, 5, 1, 2, 9, 6, 4}};

private int[][] masks1 =

{{1, 1, 1, 1, 0, 1, 0, 1, 0},

  {0, 0, 1, 1, 0, 1, 0, 1, 0},

  {0, 0, 1, 1, 1, 0, 0, 1, 1},

  {0, 0, 1, 0, 1, 1, 1, 0, 1},

  {1, 1, 0, 0, 1, 0, 0, 1, 1},

  {1, 0, 1, 1, 1, 0, 1, 0, 0},

  {1, 1, 0, 0, 1, 1, 1, 0, 0},

  {1, 0, 1, 1, 0, 1, 1, 0, 0},

  {0, 1, 0, 1, 0, 0, 1, 1, 1}};

private int[][] masks2 =

{{0, 1, 1, 0, 0, 0, 1, 1, 0},

  {0, 0, 1, 1, 1, 1, 1, 0, 1},

  {1, 1, 0, 0, 0, 1, 1, 0, 0},

  {1, 1, 0, 0, 0, 1, 0, 1, 1},

  {0, 1, 1, 0, 1, 0, 1, 1, 0},

  {1, 1, 0, 1, 0, 0, 0, 1, 1},

  {0, 0, 0, 0, 1, 1, 1, 1, 1},

  {1, 0, 1, 1, 1, 1, 1, 0, 0},

  {0, 1, 1, 0, 0, 0, 1, 1, 0}};

public Sudoku2(int s) {

Container cp = getContentPane();

cp.setLayout(new GridLayout(GRID_SIZE, GRID_SIZE));

InputListener listener = new InputListener();

for (int row = 0; row < GRID_SIZE; ++row) {

  for (int col = 0; col < GRID_SIZE; ++col) {

tfCells[row][col] = new JTextField();

switch(s)

{

case 1:

{

cp.add(tfCells[row][col]);

if (masks1[row][col]==1) {

  tfCells[row][col].setText("");

  tfCells[row][col].setEditable(true);

  tfCells[row][col].setBackground(OPEN_CELL_BGCOLOR);

  tfCells[row][col].addActionListener(listener);

  } else {

  tfCells[row][col].setText(puzzle1[row][col] + "");

  tfCells[row][col].setEditable(false);

  tfCells[row][col].setBackground(CLOSED_CELL_BGCOLOR);

  tfCells[row][col].setForeground(CLOSED_CELL_TEXT);

  }

tfCells[row][col].setHorizontalAlignment(JTextField.CENTER);

tfCells[row][col].setFont(FONT_NUMBERS);

}

break;

case 2:

{

cp.add(tfCells[row][col]);

if (masks2[row][col]==1) {

  tfCells[row][col].setText("");

  tfCells[row][col].setEditable(true);

  tfCells[row][col].setBackground(OPEN_CELL_BGCOLOR);

  tfCells[row][col].addActionListener(listener);

  } else {

  tfCells[row][col].setText(puzzle2[row][col] + "");

  tfCells[row][col].setEditable(false);

  tfCells[row][col].setBackground(CLOSED_CELL_BGCOLOR);

  tfCells[row][col].setForeground(CLOSED_CELL_TEXT);

}

tfCells[row][col].setHorizontalAlignment(JTextField.CENTER);

tfCells[row][col].setFont(FONT_NUMBERS);

  }

  break;

}

}

cp.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT));

pack();

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

setTitle("Sudoku2");

setVisible(true);

}

  }

  public static void main(String[] args) {

  Sudoku2 s = new Sudoku2(2);

  }

  private class InputListener implements ActionListener {

  @Override

public void actionPerformed(ActionEvent e) {

  boolean b=true;

  int rowSelected = -1;

  int colSelected = -1;

 

  JTextField source = (JTextField)e.getSource();

  boolean found = false;

  for (int row = 0; row < GRID_SIZE && !found; ++row) {

for (int col = 0; col < GRID_SIZE && !found; ++col) {

  if (tfCells[row][col] == source) {

rowSelected = row;

colSelected = col;

found = true; }

}

  }

  int ss;

  String s;

  s=tfCells[rowSelected][colSelected].getText();

  ss=Integer.parseInt(s);

  if(ss==puzzle1[rowSelected][colSelected]){

  tfCells[rowSelected][colSelected].setBackground(Color.GREEN);

  masks1[rowSelected][colSelected]=0;

  }

  else tfCells[rowSelected][colSelected].setBackground(Color.RED);

for(int i=0;i<9;i++){

  for(int j=0;j<9;j++){

  if(masks1[i][j]!=0)

  b=false;

  }

  }

  if(b==true)

  {

  JOptionPane.showMessageDialog(null, "Congratulation!");

 

  }

}

  }

}