Using JavaFX directly in Java without scripting

Group group = new Group();
group.set$translateX(this.translateX);
group.set$translateY(this.translateY);How can I now set the content of the group for example a rectangle and a text? Has anybody an idea?

Thanks for your reply.
But would you please elaborate on this sentence: create the fx class using Class.forName("....").newInstance()?
Indeed I implemented an interface which was extended by the javafx class, and in the main java file I need to write following codes to use this object,
Context context = FXLocal.getContext();
        FXClassType instance = context.findClass("packageName.JavaFXClass");
        ObjectValue obj = (ObjectValue)instance.newInstance();
        JavaInterface ji = (JavaInterface)obj.asObject();The problem that I encountered right now is, the exception was thrown at context.findClass("javatest.MyChart");, since it's not able for the compiler to find the JavaFXClass.class.
I checked the folder build\classes\packageName and noticed that both my main JavaClass and JavaInterface have been compiled with .class file, while the JavaFXClass was not, which means the file JavaFXClass.class doesn't exist.
What's the solution?

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Thanks for your reply.
But would you please elaborate on this sentence: create the fx class using Class.forName("....").newInstance()?
Indeed I implemented an interface which was extended by the javafx class, and in the main java file I need to write following codes to use this object,
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I checked the folder build\classes\packageName and noticed that both my main JavaClass and JavaInterface have been compiled with .class file, while the JavaFXClass was not, which means the file JavaFXClass.class doesn't exist.
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