class Demo {

    public void display(Player viewer) {
        Hologram hologram = TrHologramAPI
                .builder(viewer.getLocation())
                .append("Hello World")
                .append(player -> player.getInventory().getItemInMainHand(), 40)
                .interspace(0.5)
                .append("Time: %server_time_ss%", 20)
                .build();

        hologram.refreshVisibility(viewer);

        TextHologram line = hologram.getTextLine(0);
        line.setText("Hello TrHologram");
    }

}