I am trying to understand gridpane and how to use it with combobox, and VBox/HBox

问题

I have a more simpler program that just shows the name and the address. I am playing around with place in the gridpane to put these things. Eventually, I would like a combobox, and a clockAnimation in the gridpane. I really don't know how to use HBox/VBox within gridpane, and if I can use them and label and text together. What I am trying to do is put a combo box in the middle of the gridpane, and a clock on the right. I would like to use the the gridpane, and HBox and VBox. I just don't want to use Borderpane, but Gridpane. I have a simple combo box, but it gets put into the wrong places when I am using Gridpane for the first time.

Here is the program:

import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Label;
import javafx.scene.control.RadioButton;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
 //import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;

import javafx.scene.control.Alert;

 public class GridPane_Test extends Application {

 public enum choices {       //  USE PRIVATE circle, rectangle, triangle??
    CHOOSE_ONE, CIRCLE, RECTANGLE, TRIANGLE
}

   protected GridPane getGPane() {

    //Label lblName = new Label("Enter the name:\t");
    /*
    txtName = new TextField();
    txtName.setMinWidth(100);
    txtName.setPrefWidth(200);
    txtName.setMaxWidth(1700);
    txtName.setPromptText("Enter the name here:\t");
     */ 

    //VBox paneSize = new VBox()

       GridPane gPane = new GridPane();
       gPane.setPadding(new Insets(10));
       gPane.setHgap(10);
       gPane.setVgap(10);
       gPane.setMinWidth(500);
       gPane.setMaxWidth(800);
       gPane.setPrefWidth(500);

    TextField txtName;   
    Label lblName = new Label("Enter the name:\t");
    txtName = new TextField();
    txtName.setMinWidth(100);
    txtName.setPrefWidth(200);
    txtName.setMaxWidth(1700);
    txtName.setPromptText("Enter the name here:\t");

    TextField txtAddress;
    //Create address for label and text
    Label lblAddress = new Label("Enter the Address:\t");
    txtAddress = new TextField();
    //lblAddress.maxHeight(1200);
    //lblAddress.maxWidth(1200);
    txtAddress.setMinWidth(100);
    txtAddress.setPrefWidth(200);
    txtAddress.setMaxWidth(300);
    txtAddress.setPromptText("Enter the address here:\t");

    //VBox paneSize = new VBox(lblSize, rdoSmall, rdoMedium, rdoLarge);
    HBox testN_A = new HBox(lblName, txtName, lblAddress, txtAddress);
   gPane.add(lblName, 10, 5);
    gPane.add(txtName, 11, 5);

    gPane.add(lblAddress, 10, 6);
    gPane.add(txtAddress, 11, 6); 

    gPane.addRow(2, testN_A);  //????
    //gPane.addColumn(15, lblName, txtName);

    return gPane;
   }
   @Override
public void start(Stage primaryStage) {

    Scene scene = new Scene(getGPane(), 900, 700);
    primaryStage.setTitle("Hello GridPane!!!");
    primaryStage.setScene(scene);
    primaryStage.show();
}
public static void main(String[] args) {
    launch(args);
}

}

I included the old gridpane program. I know it is old an I need to work on the Message part. I have a combo box that does this, but I need to understand the gridpane.

Thanks

My messagebox does not work in this GridPane

来源：https://stackoverflow.com/questions/59692791/i-am-trying-to-understand-gridpane-and-how-to-use-it-with-combobox-and-vbox-hbo