ManuBar menubar = new MenuBar(); //creating MenuBar
Menu MenuName = new Menu("Menu Name"); //creating Menu
MenuItem MenuItem1 = new MenuItem("Menu Item 1 Name"); //creating Menu Item 
MenuName.getItems().add(MenuItem1); //adding Menu Item to the Menu
menubar.getMenus().add(MenuName); //adding Menu to the MenuBar 

package application;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class MenuExample extends Application {
public static void main(String[] args) {
launch(args);
    }

@Override
public void start(Stage primaryStage) throws Exception {
// TODO Auto-generated method stub
BorderPane root = new BorderPane();
Scene scene = new Scene(root,200,300);
MenuBar menubar = new MenuBar();
Menu FileMenu = new Menu("File");
MenuItem filemenu1=new MenuItem("new");
MenuItem filemenu2=new MenuItem("Save");
MenuItem filemenu3=new MenuItem("Exit");
Menu EditMenu=new Menu("Edit");
MenuItem EditMenu1=new MenuItem("Cut");
MenuItem EditMenu2=new MenuItem("Copy");
MenuItem EditMenu3=new MenuItem("Paste");
EditMenu.getItems().addAll(EditMenu1,EditMenu2,EditMenu3);
root.setTop(menubar);
FileMenu.getItems().addAll(filemenu1,filemenu2,filemenu3);
menubar.getMenus().addAll(FileMenu,EditMenu);
primaryStage.setScene(scene);
    primaryStage.show();

}
}