Hologram

The main class is Hologram. This is an abstract class, so to define your holograms you must extend this class.

A hologram is composed of lines, defined by the Line<*> interface. The lines can be either text or an item/block/dropped item.

As you saw in the Hello World example, the Hologram class provides these three methods, textLine, itemLine and blockLine, which should preferably be assigned to a class field; however, you can also call them in the constructor.

The order of the fields will correspond to the order of the lines in the hologram.

Having them as fields or accessible through a getter allows you to retrieve information or perform actions on a specific line.

public class MyHolo extends Hologram {

    public Line<String> counter = textLine("Hello World");
    public Line<ItemStack> status = itemLine(new ItemStack(Material.RED_DYE));

    public MyHolo(@NotNull Location location) {
        super(location);
    }
}

In this example, the hologram will display the text "Hello World" with a RED_DYE dropped below it.

For more complex lines, take a look at TextLine, ItemLine or BlockLine. Once we've created our hologram class, we can instantiate it. This does not mean the hologram is visible yet.