Scoreboard Problem, Help!

When a player joins the server, they are assigned a blank scoreboard. Whenever a player joins or the scoreboard gets updated meaning that when i kill someone or a zombie the scoreboard remains the same but when i log off and log back in then the scoreboard changes...anyone knows how i do it? i tried lot of codes from websites and other people problems but their code is not working for me. I might have to run a scheduler where it updates it but im not sure how i can do this cuz im just learning
http://pastebin.com/aGaGHyh1

this can be for the scoreboard but i don't know how i should really make it

BukkitScheduler scheduler = Bukkit.getServer().getScheduler();
scheduler.scheduleSyncRepeatingTask(this, new Runnable() {
@Override
public void run() {
// Do something
}
}, 0L, 20L);
}

 

I'll quote the same as I did on Spigot:

• You don't need to send an enable message, Bukkit does this for you.
• You also don't need a disable message, Bukkit does this too, with the version.
• What is your static 'A' ArrayList for? Also, remember to follow naming conventions.
• Why is your 'Format' method static? You're only using it in that class.
• Instead of replacing the "&" with the "§" symbol, use ChatColor#translateAlternateColorCodes for further compatibility.
• To use the Runnable, the 0L is the delay, and the 20L is how often it repeats. So currently, it will run every 20 ticks.
• Just send the player the scoreboard on update, and you should be all good!

Hope I helped, and have a great day/night,
- GamerzKing