addo save in json files

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

@@ -1,5 +1,6 @@
 package sudoku.io;
 
+import java.io.*;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -14,7 +15,7 @@ import sudoku.structure.SudokuFactory;
 
 public class SudokuSerializer {
 
-	public static String serializeSudoku(final MultiDoku multidoku) {
+	public static JSONObject serializeSudoku(final MultiDoku multidoku) {
 		List<Cell> cellIds   = new ArrayList<>();
 		List<Block> blockIds = new ArrayList<>();
 
@@ -39,11 +40,11 @@ public class SudokuSerializer {
 				}
 
 				int blockID = blockIds.indexOf(block);
-				int symboleIndex = cell.getSymbolIndex();
+				int symbolIndex = cell.getSymbolIndex();
 
 				JSONObject cellJsonObject = new JSONObject();
 				cellJsonObject.put("blockID", blockID);
-				cellJsonObject.put("symboleIndex", symboleIndex);
+				cellJsonObject.put("symbolIndex", symbolIndex);
 				if (!cell.isMutable()) {
 					cellJsonObject.put("immutable", true);
 				}
@@ -96,11 +97,38 @@ public class SudokuSerializer {
 		jsonRoot.put("multidoku", jsonSudokus);
 		jsonRoot.put("cells", jsonCells);
 		jsonRoot.put("blocks", jsonBlocks);
-		return jsonRoot.toString();
+
+		return jsonRoot;
 	}
 
-	public static MultiDoku deserializeSudoku(final String data) {
-		JSONObject jsonObject = new JSONObject(data);
+	public static void saveMultiDoku(final MultiDoku doku) {
+
+		JSONObject jsonRoot = serializeSudoku(doku);
+
+		File f = new File("save", "save.json");
+		InputStream is = null;
+		int i = 1;
+
+		while (f.exists()) {
+			String newName = "save-" + i + ".json";
+			f = new File("save", newName);
+			i++;
+		}
+
+		try (FileWriter file = new FileWriter(f)) {
+			file.write(jsonRoot.toString(3));
+			//file.flush();
+		} catch (IOException e) {
+			e.fillInStackTrace();
+		}
+	}
+
+	public static MultiDoku deserializeSudoku(final String json) {
+		JSONObject jsonRoot = new JSONObject(json);
+		return deserializeSudoku(jsonRoot);
+	}
+
+	public static MultiDoku deserializeSudoku(final JSONObject jsonObject) {
 
 		List<Cell> cells = new ArrayList<>();
 		List<Block> blocks = new ArrayList<>();
@@ -110,11 +138,11 @@ public class SudokuSerializer {
 		JSONArray cellsJson = jsonObject.getJSONArray("cells");
 		for (int i = 0; i < cellsJson.length(); i++) {
 			JSONObject entry = cellsJson.getJSONObject(i);
-			int symboleIndex = entry.getInt("symboleIndex");
+			int symbolIndex = entry.getInt("symbolIndex");
 			if (entry.has("immutable")) {
-				cells.add(new Cell(symboleIndex, false));
+				cells.add(new Cell(symbolIndex, false));
 			} else {
-				cells.add(new Cell(symboleIndex));
+				cells.add(new Cell(symbolIndex));
 			}
 		}