basic nav bar implemented and documentation added.

src/App.java

@@ -9,16 +9,26 @@ import java.awt.Dimension;
  * Runner class for the Sudoku App, managing the GUI and coordinating internal logic.
  */
 public class App extends JFrame {
-    private Settings settings;
+    // GUI fields
+    private Nav nav;
 
+    // Data fields
+    private Settings settings;
+    private SudokuChecker checker;
+
+    /**
+     * Create a new App object, initializing the GUI and internal logic.
+     */
     public App() {
         super("Sudoku");
         settings = new Settings();
+        nav = new Nav(settings, false);
         initSetup();
+        add(createApp());
     }
 
     /**
-     * Basic JFrame setup for the GUI.
+     * Basic JFrame settings and setup for the GUI.
      */
     private void initSetup() {
         // TODO: These are just some default values, these should use the values from Settings.
@@ -36,17 +46,31 @@ public class App extends JFrame {
         }
     }
 
+    /**
+     * Create the root JPanel holding all other GUI components.
+     * 
+     * @return JPanel
+     */
     private JPanel createApp() {
         // TODO: Create the root JPanel holding all other GUI components.
-
-        return null;
+        JPanel root = new JPanel();
+            root.add(nav);
+        return root;
     }
 
+    /**
+     * Run the Sudoku App in a command-line interface for debugging core logic.
+     */
     public static void cli() {
-        Nav nav = new Nav(new Settings());
+        Nav nav = new Nav(new Settings(), true);
         SudokuChecker check = new SudokuChecker(nav.getLoadedGrid());
     }
 
+    /**
+     * Main method for the Sudoku App.
+     * 
+     * @param args
+     */
     public static void main(String[] args) {
         if(args.length == 0)
             new App().setVisible(true);

src/Nav.java

@@ -4,6 +4,8 @@ import java.io.FileNotFoundException;
 
 import javax.swing.JPanel;
 import javax.swing.JComboBox;
+import javax.swing.JLabel;
+import javax.swing.JButton;
 
 /**
  * The Nav class represents the Navigation bar at the top of the JFrame window.
@@ -53,22 +55,57 @@ public class Nav extends JPanel {
      *
      * @param Settings
      */
-    public Nav(Settings s) {
+    public Nav(Settings s, boolean cli) {
         super();
         this.s = s;
-        System.out.println("Welcome to the Sudoku Solver!");
+        
+        if(cli) {
+            System.out.println("Welcome to the Sudoku Solver!");
 
-        Scanner in = new Scanner(System.in);
-            System.out.print(
-                    "Enter the name of the input file (do not " +
-                    "include the file extension): "
-                    );
-            String inputFilename = in.nextLine();
-        in.close();
+            Scanner in = new Scanner(System.in);
+                System.out.print(
+                        "Enter the name of the input file (do not " +
+                        "include the file extension): "
+                        );
+                String inputFilename = in.nextLine();
+            in.close();
 
-        openFile(inputFilename);
+            openFile(inputFilename);
+        } else {
+            // TODO: Create the GUI for the Nav bar.
+            createGUI();
+        }
     }
 
+    /**
+     * Create the GUI for the Nav bar.
+     * 
+     * This method is called when the Nav object is created in the App
+     * class if the program is not being run in the command-line for
+     * debugging purposes.
+     */
+    private void createGUI() {
+        JComboBox<String> fileOptions = new JComboBox<String>();
+            fileOptions.addItem("New");
+            fileOptions.addItem("Open");
+            fileOptions.addItem("Save");
+            fileOptions.addItem("Exit");
+            
+        JLabel elapsedTime = new JLabel("Elapsed Time: 00:00:00");
+
+        JButton solve = new JButton("Solve");
+
+        add(fileOptions);
+        add(elapsedTime);
+        add(solve);
+    }
+
+    /**
+     * Given the user's selection from the JComboBox, perform the appropriate
+     * action.
+     *
+     * @param String
+     */
     private void newFile() {
         int defaultOption = s.getNewFileProperties();
 
@@ -106,6 +143,10 @@ public class Nav extends JPanel {
         createGrid(f);
     }
 
+    /**
+     * Save the currently open .sdku file with any changes the user has made.
+     * This needs to pull the current state of the grid from the Board JPanel.
+     */
     private void saveFile() {
         // TODO: Get the current Cell[][] from the Board JPanel
         // TODO: Write to a file.

src/Settings.java

@@ -11,6 +11,10 @@ public class Settings {
     private int newFileProperties;
     private String defaultDirectory;
 
+    /**
+     * Create a new Settings object, initializing the default settings
+     * or reading in the settings from a file if it exists.
+     */
     public Settings() {
         // TODO: Read in a file from the master default directory and populate
         // settings, effectively toggles. If the file does not exist,

src/SudokuChecker.java

@@ -5,43 +5,21 @@ import java.util.Scanner;
 
 
 /**
- * A Sudoku puzzle is a 9x9 grid of numbers, where each row, column, and 3x3 subgrid contains the numbers 1-9 exactly once.
+ * The SudokuChecker class is responsible for checking the validity of a given Sudoku puzzle solution.
  * 
- * The goal of this challenge is to write a program that can solve Sudoku puzzles.
- * 
- * Given an input .sdku file (a plain-text file containing the initial state of a Sudoku puzzle), find the solution to the puzzle and write the solution to a new .sdku file.
- * 
- * The input file will contain 9 lines, each containing 9 characters. Each character will be a digit (1-9) or a period (.), representing an empty cell.
- * 
- * The output file should contain the same 9x9 grid, with the empty cells filled in with the correct numbers.
- * 
- * For example, given the following input file:
- * 
- *      53..7....
- *      6..195...
- *      .98....6.
- *      8...6...3
- *      4..8.3..1
- *      7...2...6
- *      .6....28.
- *      ...419..5
- *      ....8..79
- * 
- * The output file should be:
- * 
- *     534678912
- *     672195348
- *     198342567
- *     859761423
- *     426853791
- *     713924856
- *     961537284
- *     287419635
- *     345286179
+ * The SudokuChecker class is also responsible for solving a given Sudoku puzzle.
  */
 public class SudokuChecker {
     private Cell[][] grid;
     
+    /**
+     * Create a new SudokuChecker object, initializing the grid to the given 9x9 grid of numbers.
+     * This should either check each cell as the user inputs a value, or be used to check the validity of a
+     * puzzle when the user requests it.
+     * 
+     * TODO: Currently, this class is not used in the GUI. It is only used in the command-line interface.
+     * @param grid
+     */
     public SudokuChecker(Cell[][] grid) {
         this.grid = grid;
         solve();