public Set<Region> Regions = new HashSet<>();
public Map<UUID, Region> isInside = new HashMap<>();

public boolean isPlayerInRegion( Player player, Region region ) {
		// Prüfen ob Spieler in der Region ist!
		Location l = player.getLocation();
		if ( l.getX() > region.FX
				&& l.getX() < region.TX
				&& l.getZ() > region.FZ
				&& l.getZ() < region.TZ
				&& l.getY() > region.FY
				&& l.getY() < region.TY ) {
			return true;
		} else {
			return false;
		}
	}

@Override
	public void run() {
		for ( Player p : Bukkit.getOnlinePlayers() ) {
			for ( Region r : Regions ) {
				if ( isPlayerInRegion( p, r ) && !r.equals( isInside.get( p.getUniqueId() ) ) ) {
					p.sendMessage( ChatColor.BLUE + r.Name + " betreten!" );
					isInside.put( p.getUniqueId(), r );
//					if ( r.Name.equals( "Test" ) ) {
//					}
					break;
				}
			}
		}
	}