scheduleSyncRepeatingTask problem

I'm trying to setup a radiation system to when a player stands on a gold block they gain radiation and when they step off they lose it.

this is my code anyone got any ideas on how I could achieve this?

Code:

 @EventHandler
        public void onPlayerMoveEvent(PlayerMoveEvent event) {
            final Player player = (Player) event.getPlayer();
            final String playername = player.getName();
            if(event.getTo().getBlock().getRelative(BlockFace.DOWN).getType() == Material.GOLD_BLOCK && event.getFrom().getBlock().getRelative(BlockFace.DOWN).getType() != Material.GOLD_BLOCK) {
                    if(!(ongoldblock.contains(playername))){
                        ongoldblock.add(playername);
                        Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable(){
                   
                        public void run() {
                         
                                number += 1;
                            }
                   
                   
                        }, 0, 200);
                       
                if(event.getFrom().getBlock().getRelative(BlockFace.DOWN).getType() == Material.GOLD_BLOCK && event.getTo().getBlock().getRelative(BlockFace.DOWN).getType() != Material.GOLD_BLOCK) { 
                    if(ongoldblock.contains(playername)){
                        ongoldblock.remove(playername);
                        Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable(){
                        public void run() {
                           
                            number -= 1;
                       
                        }
                 
               
                    }, 0, 200);
                   
                     
                    }
                }
          }
      }
}

 

Why casting player object to player object? Getplayer returns player object so the cast is useless.

To achieve this have a int of 3000 (unique for each player) for instance and when they are on told, put them in a array list that contains only players, then have a sync repeating task (just one for the whole plugin) that each 5 ticks loops thru all the players in the array list and adds 1 to each ones Int. when they leave do the same but instead of adding a int, remove it