Nature

    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent event) {
        if(event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
            Player player = event.getPlayer();
            Game game = main.getGame();

            if (event.getItem().equals(red)) {
                if(game.isPlayerRed(player)) {
                    player.sendMessage(ChatColor.WHITE+"You are already in "+ChatColor.RED+"Red");
                } else {
                    if(game.isPlayerBlue(player)) {
                        game.removeBluePlayer(player);
                    }
                    game.addRedPlayer(player);
                    player.sendMessage(ChatColor.WHITE+"You joined "+ChatColor.RED+"Red");
                }
            } else if (event.getItem().equals(blue)) {
                if(game.isPlayerBlue(player)) {
                    player.sendMessage(ChatColor.WHITE+"You are already in "+ChatColor.BLUE+"Blue");
                } else {
                    if(game.isPlayerRed(player)) {
                        game.removeRedPlayer(player);
                    }
                    game.addBluePlayer(player);
                    player.sendMessage(ChatColor.WHITE+"You joined "+ChatColor.BLUE+"Blue");
                }
            }
            game.updateScoreBoard();
        }
    }