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Java Build a JavaFX Application Design a Better App Separating the Layout

Whats wrong with my code? For some reason it can't resolve FMXLLOADER and Stage.

<p>Some HTML Code</p>

package sample.sup;

import javafx.application.Application; import javafx.fxml.FXMLLOADER; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.Stage; import javafx.scene.Group; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.control.TextField; import javafx.scene.layout.GridPane; import javafx.scene.layout.VBox; import javafx.scene.text.Font; import javafx.stage.Stage; import javafx.scene.text.Text;

public class Main extends Application {

@Override
public  void start(Stage primaryStage) throws Exception {
    Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
  /*  Group root = new Group();
    Text txt = new Text("Sup");
    txt.setFont(new Font("Bernard MT Condensed", 80));
    Label  label = new Label("Name:");
    TextField nameFld = new TextField();
    GridPane grid = new GridPane();
    grid.add(label, 0, 0);
    grid.add(nameFld, 1, 0);
    grid.setHgap(20);
    Button btn = new Button();
    grid.add(btn, 1, 1);
    //grid.setGridLinesVisible(true);
    btn.setText("Say Sup");
    btn.setOnAction(evt -> System.out.printf("Sup %s!%n",
           nameFld.getText()));
    txt.setY(50);
    VBox box = new VBox();
    box.getChildren().addAll(txt, grid);
    root.getChildren().add(box);*/
    primaryStage.setTitle("Sup");
    primaryStage.setScene(new Scene(root, 300, 275));
    primaryStage.show();

}
public static void main(String[] args) {
    launch(args); }

}