Need alternative to Threads.sleep

i'm trying to make a countdown to spawning and ender dragon. i have the counter working and the spawning but my problem is that the countdown doesn't show for me until it is at 0 and the dragon spawns. everyone else in the server sees it normally. Any one have suggestions? Is it something I coded wrong or, I dont even know. Code below of the spawning event.

Code:java

 
 
if (cmd.getName().equalsIgnoreCase("dragon"))
if(cs.isOp()){
counter = 10;
do{
Bukkit.getServer().broadcastMessage(ChatColor.DARK_GRAY + "Ender Dragon Fight Begins in " + ChatColor.LIGHT_PURPLE + counter);
counter = counter - 1;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}while(counter >= 1);
Bukkit.getServer().broadcastMessage(ChatColor.AQUA + "SLAY THE ENDER DRAGON!!!");
player.getWorld().spawnCreature(player.getLocation(), CreatureType.ENDER_DRAGON);
} else
player.sendMessage(ChatColor.AQUA + "Sorry You Must Be an OP to use that Command");
 
 
return true;

 

Unless you know what Thread.sleep() does, you should not use it. Instead if you need to do things that are timed bukkit has a scheduler.
http://wiki.bukkit.org/Scheduler_Programming

 

ok so i under stand the whole - code below

but i dont know how much my code needs to go inside to still get the countdown to work and then spawn.

Sorry I'm such a noob

Code:java

 
 
[SIZE=14px][COLOR=#000000]myPlugin.getServer().getScheduler().scheduleSyncDelayedTask(myPlugin, new Runnable() {
 
    public void run() {
        getServer().broadcastMessage("This message is broadcast by the main thread");
    }
}, 60L);[/COLOR][/SIZE]