Runnable Class

import org.bukkit.ChatColor;
import org.bukkit.block.Sign;

public class RepeatingTask implements Runnable {
	private MyPlugin plugin;

	public RepeatingTask(MyPlugin plugin) {
		this.plugin = plugin;
	}

	@Override
	public void run() {
		/* Do stuff here like checking statuses 'n stuff
		 * The SurvivalGames plugin also uses syncronous repeating task for updating stuff
		 *
		 * Never use Thread.sleep() or Thread.wait() or people who use y
		 * our plugin will not like it and complain it lags the server
		 *
		 * If this thread stops, the whole server stops, so if you use sleep or wait,
		 * the whole server will lag.
		 *
		 * You MUST use syncronous if you want to use the Bukkit API
		 *
		 */
		for (Sign s : plugin.signs) {
			s.setLine(0, ChatColor.GOLD + "[CastleWars]");
			s.setLine(1, "Second line");
			s.setLine(2, "Second to last line");
			s.setLine(3, "Last line");
		}
	}
}