MVC architecture user interface implemented with swing

app/src/main/java/gui/SudokuController.java

@@ -0,0 +1,86 @@
+package gui;
+
+import sudoku.SudokuSolver;
+import java.awt.event.*;
+
+/**
+ * SolverController is a controller for the SudokuSolver interface
+ */
+public class SudokuController {
+    SudokuSolver model;
+    SudokuView view;
+
+    /**
+     * Constructor
+     * 
+     * @param model SudokuSolver model
+     * @param view  SudokuView view
+     */
+    public SudokuController(SudokuSolver model, SudokuView view) {
+        this.model = model;
+        this.view = view;
+
+        // Add action listeners to the buttons
+        view.addSolveButtonListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                // Solve the board
+                model.solve();
+
+                // Update the view
+                view.updateView(model.getBoard());
+            }
+        });
+
+        view.addResetButtonListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                // Clear the board
+                model.clear();
+
+                // Update the view
+                view.updateView(model.getBoard());
+            }
+        });
+
+        view.addRandomButtonListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                // Randomize the board
+                model.randomizeBoard();
+
+                // Update the view
+                view.updateView(model.getBoard());
+            }
+        });
+
+        view.addCellClickListener(new CellActionListener());
+    }
+
+    /** Start the GUI */
+    public void start() {
+        view.setVisible(true);
+    }
+
+    /**
+     * CellActionListener is an ActionListener for the Sudoku grid cells
+     */
+    private class CellActionListener implements ActionListener {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            // Get the row and column from the clicked cell
+            int row = view.getSelectedRow();
+            int col = view.getSelectedColumn();
+
+            String inputText = view.getCellValue(row, col);
+            int value = Integer.parseInt(inputText);
+            // Check if the input is legal and update the model and view
+            if (model.isLegal(row, col, value)) {
+                model.set(row, col, value);
+                view.updateView(model.getBoard());
+            } else {
+                view.showErrorMessage("Invalid input. Try again.");
+            }
+        }
+    }
+}

app/src/main/java/gui/SudokuView.java

@@ -0,0 +1,186 @@
+package gui;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+/**
+ * SolverView is a GUI for the SudokuSolver interface
+ */
+public class SudokuView extends JFrame {
+    /** The grid of text fields */
+    private JTextField[][] grid;
+
+    /** Button for solve */
+    private JButton solveButton;
+    /** Button for reset */
+    private JButton resetButton;
+    /** Button for random */
+    private JButton randomButton;
+
+    /** Constructor */
+    public SudokuView() {
+        setTitle("Sudoku Solver");
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLayout(new BorderLayout());
+
+        initializeGrid();
+        initializeButtons();
+
+        pack();
+        setLocationRelativeTo(null);
+    }
+
+    /** Initialize the grid, called by the constructor */
+    private void initializeGrid() {
+        grid = new JTextField[9][9];
+        JPanel gridPanel = new JPanel(new GridLayout(9, 9));
+
+        for (int row = 0; row < 9; row++) {
+            for (int col = 0; col < 9; col++) {
+                grid[row][col] = new JTextField(2);
+                grid[row][col].setHorizontalAlignment(JTextField.CENTER);
+                gridPanel.add(grid[row][col]);
+            }
+        }
+
+        add(gridPanel, BorderLayout.CENTER);
+    }
+
+    /** Initialize the buttons, called by the constructor */
+    private void initializeButtons() {
+        solveButton = new JButton("Solve");
+        resetButton = new JButton("Reset");
+        randomButton = new JButton("Randomize");
+
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.add(solveButton);
+        buttonPanel.add(resetButton);
+        buttonPanel.add(randomButton);
+
+        add(buttonPanel, BorderLayout.SOUTH);
+    }
+
+    /**
+     * Update the view with a new grid
+     * 
+     * @param newGrid the new grid to display
+     */
+    public void updateView(int[][] newGrid) {
+        for (int row = 0; row < 9; row++) {
+            for (int col = 0; col < 9; col++) {
+                if (newGrid[row][col] != 0) {
+                    grid[row][col].setText(String.valueOf(newGrid[row][col]));
+                } else {
+                    grid[row][col].setText("");
+                }
+            }
+        }
+    }
+
+    /**
+     * Method to add ActionListener to solve button
+     * 
+     * @param listener the ActionListener to add
+     */
+    public void addSolveButtonListener(ActionListener listener) {
+        solveButton.addActionListener(listener);
+    }
+
+    /**
+     * Method to add ActionListener to reset button
+     * 
+     * @param listener the ActionListener to add
+     */
+    public void addResetButtonListener(ActionListener listener) {
+        resetButton.addActionListener(listener);
+    }
+
+    /**
+     * Method to add ActionListener to randomize button
+     * 
+     * @param listener the ActionListener to add
+     */
+    public void addRandomButtonListener(ActionListener listener) {
+        randomButton.addActionListener(listener);
+    }
+
+    /**
+     * Method to add ActionListener to individual cells in the grid
+     * <p>
+     * Assumes that the ActionListener will be the same for all cells
+     * and that the listener will be capable of determining which cell
+     * was clicked
+     * 
+     * @param listener the ActionListener to add
+     */
+    public void addCellClickListener(ActionListener listener) {
+        for (int row = 0; row < 9; row++) {
+            for (int col = 0; col < 9; col++) {
+                grid[row][col].addActionListener(listener);
+            }
+        }
+    }
+
+    /**
+     * Getter method to retrieve the values from the text fields
+     * 
+     * @param row the row of the cell
+     * @param col the column of the cell
+     * @return the value of the cell
+     */
+    public String getCellValue(int row, int col) {
+        return grid[row][col].getText();
+    }
+
+    /**
+     * Method to get the selected row (example implementation)
+     * 
+     * @return the selected row, or -1 if no cell is selected
+     */
+    public int getSelectedRow() {
+        for (int row = 0; row < 9; row++) {
+            for (int col = 0; col < 9; col++) {
+                if (grid[row][col].isFocusOwner()) {
+                    return row;
+                }
+            }
+        }
+        return -1; // Return -1 if no cell is selected
+    }
+
+    /**
+     * Method to get the selected column (example implementation)
+     * 
+     * @return the selected row, or -1 if no cell is selected
+     */
+    public int getSelectedColumn() {
+        for (int row = 0; row < 9; row++) {
+            for (int col = 0; col < 9; col++) {
+                if (grid[row][col].isFocusOwner()) {
+                    return col;
+                }
+            }
+        }
+        return -1; // Return -1 if no cell is selected
+    }
+
+    /**
+     * Methods to show dialogs
+     * 
+     * @param message the message to display
+     * @return the user input
+     */
+    public String showInputDialog(String message) {
+        return JOptionPane.showInputDialog(this, message);
+    }
+
+    /**
+     * Method to show error messages
+     * 
+     * @param message the message to display
+     */
+    public void showErrorMessage(String message) {
+        JOptionPane.showMessageDialog(this, message);
+    }
+}

app/src/main/java/sudoku/SolverMain.java

@@ -1,12 +1,34 @@
 package sudoku;
 
+import gui.SudokuController;
+import gui.SudokuView;
+
+/** SolverMain is the main class for the Sudoku Solver */
 public class SolverMain {
+
+    private Solver model;
+    private SudokuView view;
+    private SudokuController controller;
+
+    /** Constructor */
+    SolverMain() {
+        model = new Solver();
+        view = new SudokuView();
+        controller = new SudokuController(model, view);
+    }
+
+    /** Start the GUI */
+    void start() {
+        controller.start();
+    }
+
+    /**
+     * Main method
+     * 
+     * @param args command line arguments
+     */
     public static void main(String[] args) {
-        Solver s = new Solver();
-        System.out.println(s.toString());
-        s.randomizeBoard();
-        System.out.println(s.toString());
-        s.solve();
-        System.out.println(s.toString());
+        SolverMain main = new SolverMain();
+        main.start();
     }
 }