VictoryDances

public class VictoryDance extends Cosmetics {

    public VictoryDance(String subname, int id, int cost, String permission) {
        super(subname, id, cost, permission);
    }

    public abstract void start(GamePlayer gamePlayer);

    public abstract void stop(GamePlayer gamePlayer);
}

Example.class

public class Example extends VictoryDance {

   public Example() {
        super("Example", 0, 100, "skywars.cosmetics.dance.example");
    }


    public void start(GamePlayer gamePlayer) {
        Location location = gamePlayer.getLocation();
        Firework firework = location.getWorld().spawn(location.clone().add(0.5D, 0.5D, 0.5D), Firework.class);
        FireworkMeta fireworkMeta = firework.getFireworkMeta();
        FireworkEffect fireworkEffect = FireworkEffect.builder()
                .with(FireworkEffect.Type.BALL)
                .withColor(Color.RED)
                .withFade(Color.AQUA)
                .flicker(true)
                .trail(true)
                .build();
        fireworkMeta.setPower(1);
        fireworkMeta.addEffect(fireworkEffect);
        firework.setFireworkMeta(fireworkMeta);
    }

    public void stop(GamePlayer gamePlayer) {
      //what is executed once the game end countdown is over
    }
}