JavaFX and Scene Builder - Adding and Deleting TableView Rows

Controller.java

package sample;

import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    //Table
    @FXML
    private TableView<Customer> tableView;

    //Columns
    @FXML
    private TableColumn<Customer, String> nameColumn;

    @FXML
    private TableColumn<Customer, Integer> ageColumn;

    @FXML
    private TableColumn<Customer, Integer> numberColumn;

    //Text input
    @FXML
    private TextField nameInput;

    @FXML
    private TextField ageInput;

    @FXML
    private TextField numberInput;


    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        nameColumn.setCellValueFactory(new PropertyValueFactory<Customer, String>("name"));
        ageColumn.setCellValueFactory(new PropertyValueFactory<Customer, Integer>("age"));
        numberColumn.setCellValueFactory(new PropertyValueFactory<Customer, Integer>("number"));
    }

    //Submit button
    @FXML
    void submit(ActionEvent event) {
        Customer customer = new Customer(nameInput.getText(),
                Integer.parseInt(ageInput.getText()),
                Integer.parseInt(numberInput.getText()));
        ObservableList<Customer> customers = tableView.getItems();
        customers.add(customer);
        tableView.setItems(customers);
    }

    @FXML
    void removeCustomer(ActionEvent event) {
        int selectedID = tableView.getSelectionModel().getSelectedIndex();
        tableView.getItems().remove(selectedID);
    }
}

Customer.java

package sample;

public class Customer {

    private String name;
    private int age;
    private int number;

    public Customer(String name, int age, int number) {
        this.name = name;
        this.age = age;
        this.number = number;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getNumber() {
        return number;
    }

    public void setNumber(int number) {
        this.number = number;
    }
}

Main.java

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }


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

sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Text?>


<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <TableView fx:id="tableView" layoutX="337.0" layoutY="73.0" prefHeight="255.0" prefWidth="225.0">
        <columns>
          <TableColumn fx:id="nameColumn" prefWidth="75.0" text="Name" />
          <TableColumn fx:id="ageColumn" prefWidth="75.0" text="Age" />
            <TableColumn fx:id="numberColumn" prefWidth="75.0" text="Number" />
        </columns>
      </TableView>
      <VBox layoutX="68.0" layoutY="101.0" prefHeight="200.0" prefWidth="200.0" spacing="5.0">
         <children>
            <Text strokeType="OUTSIDE" strokeWidth="0.0" text="Name" />
            <TextField fx:id="nameInput" />
            <Text strokeType="OUTSIDE" strokeWidth="0.0" text="Age" />
            <TextField fx:id="ageInput" />
            <Text layoutX="10.0" layoutY="75.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Number" />
            <TextField fx:id="numberInput" />
            <Button mnemonicParsing="false" onAction="#submit" prefHeight="25.0" prefWidth="200.0" text="Submit" />
         </children>
      </VBox>
      <Button layoutX="420.0" layoutY="349.0" mnemonicParsing="false" onAction="#removeCustomer" text="Remove" />
   </children>
</AnchorPane>