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

@@ -88,7 +88,8 @@ public class SudokuController {
             int row = view.getSelectedRow();
             int col = view.getSelectedColumn();
 
-            int value = Integer.parseInt(view.getCellValue(row, col));
+            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);

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

@@ -115,11 +115,7 @@ public class Solver implements SudokuSolver {
         }
     }
 
-    /** 
+    /** {@inheritDoc} */
-     * {@inheritDoc} 
-     * <p>
-     * This is <b>not</b> checked for validity
-     */
     @Override
     public void set(int row, int col, int val) {
         if (row < 9 && col < 9) {