Good example:observalbe listtableviewsimle database

ObservableDBwithTableView

import javafx.application.Application;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.*;
import javafx.stage.Stage;

public class Main extends Application {

    Stage window;
    TableView<Product> table;
    TextField nameInput, priceInput, quantityInput;

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

    @Override
    public void start(Stage primaryStage) {
        window = primaryStage;
        window.setTitle("Austin");

        //Name column
        TableColumn<Product, String> nameColumn = new TableColumn<>("Name");
        nameColumn.setMinWidth(200);
        nameColumn.setCellValueFactory(new PropertyValueFactory<>("name"));

        //Price column
        TableColumn<Product, Double> priceColumn = new TableColumn<>("Price");
        priceColumn.setMinWidth(100);
        priceColumn.setCellValueFactory(new PropertyValueFactory<>("price"));

        //quantity column
        TableColumn<Product, Integer> quantityColumn = new TableColumn<>("Quantity");
        quantityColumn.setMinWidth(100);
        quantityColumn.setCellValueFactory(new PropertyValueFactory<>("quantity"));


        //Name Input
        nameInput = new TextField();
        nameInput.setPromptText("Name");

        //Price Input
        priceInput = new TextField();
        priceInput.setPromptText("Price");

        //Quantity Input
        quantityInput = new TextField();
        quantityInput.setPromptText("Quantity");

        //Button
        Button addButton = new Button("Add");
        Button deleteButton = new Button("Delete Item");

        //Button Events
        addButton.setOnAction(event -> addButtonClicked());
        deleteButton.setOnAction(event -> deleteButtonClicked());

        HBox hBox = new HBox();
        hBox.setPadding(new Insets(10, 10, 10, 10));
        hBox.setSpacing(10);
        hBox.getChildren().addAll(nameInput, priceInput, quantityInput, addButton, deleteButton);

        table = new TableView<>();
        table.setItems(getProduct());
        table.getColumns().addAll(nameColumn, priceColumn, quantityColumn);

        //Layout
        VBox vBox = new VBox();
        vBox.getChildren().addAll(table, hBox);

        Scene scene = new Scene(vBox);
        window.setScene(scene);

        window.show();
    }

    //Add button clicked
    public void addButtonClicked(){
        Product product = new Product();
        product.setName(nameInput.getText());
        product.setPrice(Double.parseDouble(priceInput.getText()));
        product.setQuantity(Integer.parseInt(quantityInput.getText()));
        table.getItems().add(product);
        nameInput.clear();
        priceInput.clear();
        quantityInput.clear();
    }

    //Delete button clicked
    public void deleteButtonClicked(){
        ObservableList<Product> productSelected, allProducts;
        allProducts = table.getItems();
        productSelected = table.getSelectionModel().getSelectedItems();

        productSelected.forEach(allProducts::remove);
    }

    //Get all of the products
    public ObservableList<Product> getProduct(){
        ObservableList<Product> products = FXCollections.observableArrayList();
        products.add(new Product("laptop", 859, 20));
        products.add(new Product("fan", 59, 10));
        products.add(new Product("chair", 89, 2));
        products.add(new Product("movies", 19, 12));
        products.add(new Product("Mountain Dew", 8, 100));
        return products;
    }

}

Product.java

public class Product {

    private String name;
    private double price;
    private  int quantity;

    public Product(){
        this.name = "";
        this.price = 0;
        this.quantity = 0;
    }

    public Product(String name, double price, int quantity){
        this.name = name;
        this.price = price;
        this.quantity = quantity;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

    public int getQuantity() {
        return quantity;
    }

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

    public void setPrice(double price) {
        this.price = price;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
}