Seperated Scoreboards

I want to give online players a seperate scoreboard.The title & score name will be the same but the score for each player will be different.
I've made 4 scoreboards but I don't know how to assign them to 4 onlineplayers onPlayerJoinEvent.What should I do?
P.S how would I save the players score after the server reloads?

Code:

public class Main extends JavaPlugin{
    private Scoreboard board;
    private Objective o;
    private Score score;
    private Scoreboard board2;
    private Objective o2;
    private Score score2;
    private Scoreboard board3;
    private Objective o3;
    private Score score3;
    private Scoreboard board4;
    private Objective o4;
    private Score score4;
    public void onEnable(){
        initialize();
    }
    public void initialize(){
        ScoreboardManager sm = Bukkit.getScoreboardManager();
        board = sm.getNewScoreboard();
        o = board.registerNewObjective("Test", "dummy");
        o.setDisplayName(ChatColor.BLACK + "Scoreboardtest");
        o.setDisplaySlot(DisplaySlot.SIDEBAR);
        score = o.getScore(ChatColor.BLACK + "Score");
        board2 = sm.getNewScoreboard();
        o2 = board2.registerNewObjective("Test2", "dummy");
        o2.setDisplayName(ChatColor.BLACK + "Scoreboardtest");
        o2.setDisplaySlot(DisplaySlot.SIDEBAR);
        score2 = o.getScore(ChatColor.BLACK + "Score");
        board3 = sm.getNewScoreboard();
        o3 = board3.registerNewObjective("Test3", "dummy");
        o3.setDisplayName(ChatColor.BLACK + "Scoreboardtest");
        o3.setDisplaySlot(DisplaySlot.SIDEBAR);
        score3 = o.getScore(ChatColor.BLACK + "Score");
        o4 = board4.registerNewObjective("Test4", "dummy");
        o4.setDisplayName(ChatColor.BLACK + "Scoreboardtest");
        o4.setDisplaySlot(DisplaySlot.SIDEBAR);
        score4 = o.getScore(ChatColor.BLACK + "Score");
        score.setScore(0);
        score2.setScore(0);
        score3.setScore(0);
        score4.setScore(0);
}
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e){
        Player p = e.getPlayer();
      
      
    }
}

 

Here

Save the scoreboard data to a .yml file with the Players UUID, then call it when the player joins.

 

I've created individual scoreboards but I want to make it so that the score stays the same after the server reloads.What should I do?
P.s How would I get player2's score and change the score?

Code:

public static ScoreboardManager sm = Bukkit.getScoreboardManager();
     public static Map<UUID, Scoreboard> scoreboards = new HashMap<UUID, Scoreboard>();
@EventHandler
     public void onPlayerJoin(PlayerJoinEvent e){
            Player p = e.getPlayer();
            setScoreboard(p);
        }
public void setScoreboard(final Player p){
         Scoreboard board = sm.getNewScoreboard();
         Objective o = board.registerNewObjective("Test", "dummy");
         UUID uuid = p.getUniqueId();
         scoreboards.put(uuid, board);
         o.setDisplayName("Test");
         o.setDisplaySlot(DisplaySlot.SIDEBAR);
         p.setScoreboard(scoreboards.get(uuid));
         Score score = o.getScore(ChatColor.BLACK + "Score");
         score.setScore(0);
         p.setScoreboard(scoreboards.get(uuid));
     }
@Override
        public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
            Player player = (Player) sender;
            if(args.length == 1){
                String argument = args[0];
                String pscore = args[1];
                Player player2 = Bukkit.getPlayer(argument);
                    if(player2 != null && player2.isOnline()){
                    
                    }
    }
        

 

Save the score to a config file, and save it. The data should stay there after a reload.

Here, have a look under the "Scoreboards" bit

 

The scoreboard isn't displaying for players.Is something wrong?

Code:

public class Main extends JavaPlugin implements Listener{
    public static ScoreboardManager sm = Bukkit.getScoreboardManager();
     public static Map<UUID, Scoreboard> scoreboards = new HashMap<UUID, Scoreboard>();
    public void onEnable(){
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }
    public void onDisable(){
      
    }
     public void setScoreboard(final Player p){
         Scoreboard board = sm.getNewScoreboard();
         Objective o = board.registerNewObjective("Test", "dummy");
         UUID uuid = p.getUniqueId();
         scoreboards.put(uuid, board);
         o.setDisplayName("Test");
         o.setDisplaySlot(DisplaySlot.SIDEBAR);
         p.setScoreboard(scoreboards.get(uuid));
         Score score = o.getScore(ChatColor.BLACK + "Score");
         score.setScore(0);
         p.setScoreboard(scoreboards.get(uuid));
     }
     @EventHandler
     public void onPlayerJoin(PlayerJoinEvent e){
            Player p = e.getPlayer();
            setScoreboard(p);
     }
}

 

@timtower It still doesn't work.

Code:

public class Main extends JavaPlugin implements Listener{
    public static ScoreboardManager sm = Bukkit.getScoreboardManager();
     public static Map<UUID, Scoreboard> scoreboards = new HashMap<UUID, Scoreboard>();
    public void onEnable(){
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }
    public void onDisable(){
      
    }
     public void setScoreboard(final Player p){
         Scoreboard board = sm.getNewScoreboard();
         Objective o = board.registerNewObjective("Test", "dummy");
         UUID uuid = p.getUniqueId();
         scoreboards.put(uuid, board);
         o.setDisplayName("Test");
         o.setDisplaySlot(DisplaySlot.SIDEBAR);
         p.setScoreboard(scoreboards.get(uuid));
         Score score = o.getScore(ChatColor.BLACK + "Score");
         score.setScore(0);
         p.setScoreboard(scoreboards.get(uuid));
     }
     @SuppressWarnings("deprecation")
    @EventHandler
     public void onPlayerJoin(PlayerJoinEvent e){
            Player p = e.getPlayer();
            Bukkit.getScheduler().scheduleAsyncDelayedTask(this, new Runnable(){

                @Override
                public void run() {
                setScoreboard(p);
                  
                }
          
            },20 * 1);
          
     }
}

 

@timtower Changed it to a syncdelayedtask.

Code:

public class Main extends JavaPlugin implements Listener{
    public static ScoreboardManager sm = Bukkit.getScoreboardManager();
     public static Map<UUID, Scoreboard> scoreboards = new HashMap<UUID, Scoreboard>();
    public void onEnable(){
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
    }
    public void onDisable(){
    
    }
     public void setScoreboard(final Player p){
         Scoreboard board = sm.getNewScoreboard();
         Objective o = board.registerNewObjective("Test", "dummy");
         UUID uuid = p.getUniqueId();
         scoreboards.put(uuid, board);
         o.setDisplayName("Test");
         o.setDisplaySlot(DisplaySlot.SIDEBAR);
         p.setScoreboard(scoreboards.get(uuid));
         Score score = o.getScore(ChatColor.BLACK + "Score");
         score.setScore(0);
         p.setScoreboard(scoreboards.get(uuid));
     }
    @EventHandler
     public void onPlayerJoin(PlayerJoinEvent e){
            Player p = e.getPlayer();
            Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable(){

                @Override
                public void run() {
                setScoreboard(p);
                
                }
        
            },20 * 1);
        
     }
}

Buy it still throws up.a npe ....