.gitignore

@@ -5,4 +5,3 @@
 build
 
 .vscode
-app/bin

Justfile

@@ -11,7 +11,7 @@ clean:
     fd -td -I build -x rm -r
 
 watch:
-    watchexec -r -c -w app/src "just test && just run" 
+    watchexec -c -w app/src "just test && just run" 
 
 watchdoc:
-    watchexec -r -c -w app/src "just doc"
+    watchexec -c -w app/src "just doc"

app/sample_sudokus/testfall_3.txt

@@ -1,9 +0,0 @@
-1 2 3 0 0 0 0 0 0 
-4 5 6 0 0 0 0 0 0
-0 0 0 7 0 0 0 0 0
-0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0
-0 0 0 0 0 0 0 0 0

app/sample_sudokus/testfall_5.txt

@@ -1,9 +0,0 @@
-0 0 8 0 0 9 0 6 2
-0 0 0 0 0 0 0 0 5
-1 0 2 5 0 0 0 0 0
-0 0 0 2 1 0 0 9 0
-0 5 0 0 0 0 6 0 0
-6 0 0 0 0 0 0 2 8
-4 1 0 6 0 8 0 0 0
-8 6 0 0 3 0 1 0 0
-0 0 0 0 0 0 4 0 0

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

@@ -25,16 +25,10 @@ public class SudokuController {
             @Override
             public void actionPerformed(ActionEvent e) {
                 // Solve the board
-                boolean solved = model.solve();
+                model.solve();
+
                 // Update the view
                 view.updateView(model.getBoard());
-                if (!solved) {
-                    view.showErrorMessage("Could not solve the board.");
-                    System.out.println("Could not solve the board.");
-                    System.out.println(model.toString());
-                } else {
-                }
-
             }
         });
 
@@ -70,13 +64,6 @@ public class SudokuController {
                 if (newBoard != null) {
                     // Set the model
                     model.setBoard(newBoard);
-
-                    // Warn and clear if the board is not solvable
-                    if(!model.isSolvable()) {
-                        view.showErrorMessage("The board is not solvable.");
-                        model.clear();
-                    }
-
                     // Update the view
                     view.updateView(model.getBoard());
                 }
@@ -101,33 +88,14 @@ public class SudokuController {
             int row = view.getSelectedRow();
             int col = view.getSelectedColumn();
 
-            // The value to be inserted into the cell
+            int value = Integer.parseInt(view.getCellValue(row, col));
-            // Zero inicates an empty cell
+            // Check if the input is legal and update the model and view
-            // Negative values are invalid
+            if (model.isLegal(row, col, value)) {
-            int value = 0;
-
-            String cellValue = view.getCellValue(row, col);
-
-            // We need to check for null and empty string
-            if (cellValue == null || cellValue.equals("")) {
-                value = 0;
-            } else {
-                try {
-                    value = Integer.parseInt(cellValue);
-                } catch (NumberFormatException ex) {
-                    value = -1;
-                }
-            }
-
-            // If the input is invalid, value < 0 indicates parse error
-            if (value != 0 && !model.isLegal(row, col, value) || value < 0) {
-                value = 0;
-                view.showErrorMessage("Invalid input. Try again.");
-            }
-
-            // Update the model and view
                 model.set(row, col, value);
                 view.updateView(model.getBoard());
+            } else {
+                view.showErrorMessage("Invalid input. Try again.");
+            }
         }
     }
 }

app/src/main/java/sudoku/Solver.java

@@ -29,12 +29,7 @@ public class Solver implements SudokuSolver {
     /** Resets the board to all zeros */
     @Override
     public void clear() {
-        for (int[] row : board) {
+        board = new int[9][9];
-            for (int i = 0; i < row.length; ++i) {
-                row[i] = 0;
-            }
-        }
-        // board = new int[9][9];
     }
 
     /* {@inheritDoc} */
@@ -149,11 +144,6 @@ public class Solver implements SudokuSolver {
             return false;
         }
 
-        // Ihe the number is already present in the cell
-        if (board[row][col] == num) {
-            return true;
-        }
-
         // Check both the row and column
         for (int i = 0; i < 9; i++) {
             if (board[row][i] == num || board[i][col] == num) {

app/src/test/java/sudoku/SolverTest.java

@@ -107,37 +107,6 @@ class SolverTest {
         assertFalse(solver.solve());
     }
 
-    @Test
-    void unsolvableTestCase3() {
-        Solver solver = new Solver();
-
-        // More complex example
-        solver.clear();
-        solver.set(0, 0, 1);
-        solver.set(0, 1, 2);
-        solver.set(0, 2, 3);
-        solver.set(1, 0, 4);
-        solver.set(1, 1, 5);
-        solver.set(1, 2, 6);
-        solver.set(2, 3, 7);
-        assertFalse(solver.isSolvable());
-    }
-
-    @Test
-    void solvableTestCase3() {
-        Solver solver = new Solver();
-
-        // More complex example
-        solver.clear();
-        solver.set(0, 0, 1);
-        solver.set(0, 1, 2);
-        solver.set(0, 2, 3);
-        solver.set(1, 0, 4);
-        solver.set(1, 1, 5);
-        solver.set(1, 2, 6);
-        assertTrue(solver.isSolvable());
-    }
-
     @Test
     void setBoardInvalidInputThrowsTest() {
         Solver solver = new Solver();