Making DataManager methods static

src/controllers/modelcontrollers/GameManager.java

@@ -41,7 +41,7 @@ public void setGame(Game saveGame){
     // setup a game
     public void initGame(ArrayList<Player> players) {
         ArrayList<Region> regions = SettingImporter.getRegions();
-        ArrayList<String> chanceCardNames = DataManager.getInstance().getChanceCardNames();
+        ArrayList<String> chanceCardNames = DataManager.getChanceCardNames();
         game = new Game(players,regions,chanceCardNames);
     }
 

src/controllers/scenecontrollers/GameSceneController.java

@@ -259,7 +259,7 @@ public void handleEndTurnButton() {
     }
 
     public void handleSaveGameButton() {
-        DataManager.getInstance().saveGame("SaveGame1");
+        DataManager.saveGame("SaveGame1");
 
     }
 

src/controllers/scenecontrollers/LoadGameSceneController.java

@@ -33,8 +33,7 @@ public void getSavedGames() {
         buttonBox.setPrefHeight(700);
         buttonBox.setAlignment(Pos.TOP_CENTER);
         buttonBox.setSpacing(15.0);
-        DataManager dataManager = DataManager.getInstance();
-        List<String> savedNames = dataManager.getSavedNames();
+        List<String> savedNames = DataManager.getSavedNames();
         for ( String saveName: savedNames ) {
             Button newButton = new Button(saveName);
             newButton.setStyle("-fx-background-color: #5b4b4b; -fx-text-fill: #ffffff; -fx-font-size: 2em");
@@ -56,7 +55,7 @@ public void getSavedGames() {
     }
 
     public void handleLoadGameButton(ActionEvent actionEvent) {
-        DataManager.getInstance().loadGame(((Button)actionEvent.getSource()).getText());
+        DataManager.loadGame(((Button)actionEvent.getSource()).getText());
         SceneManager.getInstance().showGameScene();
     }
 

src/storage/filemanager/DataManager.java

@@ -9,25 +9,10 @@
 import java.util.List;
 
 public class DataManager {
-    // properties
-    private static DataManager dataManager = null;
-    private String saveGameFolder;
-
-    // constructor
-    public DataManager(){
-        String currentDir = System.getProperty("user.dir");
-        this.saveGameFolder = currentDir + "/saves/";
-    }
+    private static final String saveGameFolder = System.getProperty("user.dir") + "/saves/";
 
     // methods
-    public static DataManager getInstance(){
-        if(dataManager == null){
-            dataManager = new DataManager();
-        }
-        return dataManager;
-    }
-
-    public void saveGame(String saveName){
+    public static void saveGame(String saveName){
         try{
             FileOutputStream fout = new FileOutputStream(saveGameFolder + saveName + ".ser");
             ObjectOutputStream out = new ObjectOutputStream(fout);
@@ -40,7 +25,7 @@ public void saveGame(String saveName){
         }
     }
 
-    public void loadGame(String saveName){
+    public static void loadGame(String saveName){
         try{
             FileInputStream fin = new FileInputStream(saveGameFolder + saveName + ".ser");
             ObjectInputStream in = new ObjectInputStream(fin);
@@ -56,10 +41,10 @@ public void loadGame(String saveName){
      * gets filenames of saves in a List
      * @return the List of saved game file names, null if directory path is wrong or caught an exception
      */
-    public ArrayList<String> getSavedNames(){
+    public static ArrayList<String> getSavedNames(){
         ArrayList<String> savedNames = new ArrayList<>();
         //Creating a File object for directory
-        File directoryPath = new File(this.saveGameFolder);
+        File directoryPath = new File(saveGameFolder);
 
         try{
             String[] temp = directoryPath.list();
@@ -88,7 +73,7 @@ public ArrayList<String> getSavedNames(){
      * gets classNames of chance card classes in a List
      * @return the List of chance card classes file names, null if directory path is wrong or caught an exception
      */
-    public ArrayList<String> getChanceCardNames(){
+    public static ArrayList<String> getChanceCardNames(){
         ArrayList<String> names = new ArrayList<>();
         String currentDir = System.getProperty("user.dir");
         String folder = currentDir + "/src/models/chanceCards/";