gui: save sudoku

app/src/main/java/sudoku/io/SudokuSerializer.java

@@ -106,9 +106,9 @@ public class SudokuSerializer {
 	/**
 	 * Save a serialized MultiDoku in a JSON file.
 	 * @param doku MultiDoku, MultiDoku to save.
-	 * @return int, number of the save.
+	 * @return String, the path of the save.
 	 */
-	public static int saveMultiDoku(final MultiDoku doku) {
+	public static String saveMultiDoku(final MultiDoku doku) {
 
 		JSONObject jsonRoot = serializeSudoku(doku);
 
@@ -123,9 +123,9 @@ public class SudokuSerializer {
 		try (FileWriter file = new FileWriter(f)) {
 			file.write(jsonRoot.toString(3));
 		} catch (IOException e) {
-			e.fillInStackTrace();
+			e.printStackTrace();
 		}
-		return i;
+		return f.getAbsolutePath();
 	}
 
 	/**