public class ExamplePlugin extends JavaPlugin {

    private Zeus zeus;

    @Override
    public void onEnable() {
        [...]
        this.zeus = new Zeus(this, new SidebarAdapterImpl());
    }

    @Override
    public void onDisable() {
        [...]
        this.zeus = null;
    }

}

public class SidebarAdapterImpl implements SidebarAdapter {

    @Override
    public String getTitle() {
        return "Example";
    }

    @Override
    public List<String> getLines(Player player) {
        var lines = new ArrayList<String>();

        lines.add("Line 1");
        lines.add("Line 2");
        lines.add("Line 3");
        lines.add("Line 4");

        return lines;
    }
}