Load FXML for custom JavaFX component

FXMLUtil.java

import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;

import java.io.IOException;

public final class FXMLUtil {
  
    /**
        Suppose you want to create a custom component called MyComponent.
        You create a class named MyComponent and an FXML file named MyComponent.fxml,
        then call this method to load the FXML file within MyComponent's constructor
        and sets MyComponent as the controller.
        
        See https://zelinf.github.io/posts/java/2017-12-19-javafx-custom-component.html
        if you want to know more. 
    */
    public static <T extends Parent> void loadFXML(T component) {
        FXMLLoader loader = new FXMLLoader();
        loader.setRoot(component);
        loader.setControllerFactory(theClass -> component);

        String fileName = component.getClass().getSimpleName() + ".fxml";
        try {
            loader.load(component.getClass().getResourceAsStream(fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}