我终于把内容放到了我的桌子里（因为我已经掌握了多年的神秘感！）。现在我想将新项添加到列表中并自动更新表。我认为一个ObservableList可以做到这一点，但似乎还有更多。你能为我提供解决方案吗？
控制器类：
package controller;
import java.lang.reflect.Constructor;
import db.ItemLijst;
import db.Klant;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
import model.Item;
import model.ItemTypes;
public class SchermController {
@FXML
private TableView<Item> tblItems;
@FXML
private TableView<Klant> tblKlanten;
// @FXML
// private TableView<Uitlening> tblUitleningen;
@FXML
private Button btnItemToevoegen;
@FXML
private Button btnKlantToevoegen;
@FXML
private Button btnRegistreer;
@FXML
private ChoiceBox<ItemTypes> cbTypes;
@FXML
private ChoiceBox<Item> cbItems;
@FXML
private ChoiceBox<Klant> cbKlanten;
@FXML
private TextField tfTitel;
@FXML
private TextField tfVoornaam;
@FXML
private TextField tfAchternaam;
@FXML
private TextField tfStraat;
@FXML
private TextField tfNummer;
@FXML
private TextField tfPostcode;
@FXML
private TextField tfGemeente;
@FXML
private TableColumn<Item, String> tcID;
@FXML
private TableColumn<Item, ItemTypes> tcType;
@FXML
private TableColumn<Item, String> tcTitel;
@FXML
private TableColumn<Item, String> tcUitgeleend;
private ObservableList<Item> items = FXCollections.observableArrayList();
@FXML
private void initialize()
{
/*
* ItemLijst is a static object (or object with all static
methods). the CD, Film and Spel classes automatically add their record to
this class. Literally translated it means ItemList. I thought by making this
an ObservableList, the table would be automatically update its records
depending on a change to this variable (ItemLijst.items<Item>)?
*/
items = FXCollections.observableArrayList(ItemLijst.getItems());
tcID.setCellValueFactory(new PropertyValueFactory<Item, String>("ID"));
tcType.setCellValueFactory(new PropertyValueFactory<Item, ItemTypes>("Type"));
tcTitel.setCellValueFactory(new PropertyValueFactory<Item, String>("Titel"));
tcUitgeleend.setCellValueFactory(new PropertyValueFactory<Item, String>("UitgeleendString"));
tblItems.setItems(items);
// Item types
cbTypes.setItems(FXCollections.observableArrayList(ItemTypes.values()));
btnItemToevoegen.setOnAction(e -> {
try {
itemToevoegen();
} catch (Exception e1) {
System.out.println("Probleem: " + e1.getMessage());
}
});
}
/**
* This is the method which I use to add a new item to the CD, Film or Spel
class (which inherits the Item class).
*/
private void itemToevoegen() throws Exception
{
// Validatie
if (cbTypes.getValue() == null ) {
throw new Exception("Je moet een type kiezen");
} else if (tfTitel.getText().trim().isEmpty()) {
throw new Exception("Je moet een titel ingeven");
}
Class<?> klasse = Class.forName("model." + cbTypes.getValue().toString());
Constructor<?> cons = klasse.getConstructor(String.class);
cons.newInstance(tfTitel.getText());
}
}
FXML：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="438.0" prefWidth="743.0" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.SchermController">
<children>
<TabPane layoutX="-1.0" prefHeight="438.0" prefWidth="744.0" tabClosingPolicy="UNAVAILABLE">
<tabs>
<Tab closable="false" text="Items">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="367.0" prefWidth="766.0">
<children>
<TableView fx:id="tblItems" layoutX="14.0" layoutY="14.0" prefHeight="343.0" prefWidth="714.0">
<columns>
<TableColumn fx:id="tcID" prefWidth="303.0" text="Item ID" />
<TableColumn fx:id="tcType" prefWidth="76.0" text="Type" />
<TableColumn fx:id="tcTitel" prefWidth="236.0" text="Titel" />
<TableColumn fx:id="tcUitgeleend" prefWidth="98.0" text="Uitgeleend" />
</columns>
</TableView>
<ChoiceBox fx:id="cbTypes" layoutX="23.0" layoutY="365.0" prefWidth="150.0" />
<TextField fx:id="tfTitel" layoutX="201.0" layoutY="365.0" prefHeight="26.0" prefWidth="352.0" promptText="Titel van item" />
<Button fx:id="btnItemToevoegen" layoutX="592.0" layoutY="365.0" mnemonicParsing="false" prefHeight="26.0" prefWidth="131.0" text="Toevoegen" />
</children>
</AnchorPane>
</content>
</Tab>
<Tab closable="false" text="Klanten">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<TableView fx:id="tblKlanten" layoutX="14.0" layoutY="14.0" prefHeight="343.0" prefWidth="714.0">
<columns>
<TableColumn prefWidth="89.0" text="Klant ID" />
<TableColumn prefWidth="87.0" text="Voornaam" />
<TableColumn prefWidth="105.0" text="Achternaam" />
<TableColumn prefWidth="154.0" text="Straat" />
<TableColumn prefWidth="54.0" text="Nr" />
<TableColumn prefWidth="96.0" text="Postcode" />
<TableColumn prefWidth="128.0" text="Gemeente" />
</columns>
</TableView>
<TextField fx:id="tfVoornaam" layoutX="14.0" layoutY="365.0" prefHeight="26.0" prefWidth="105.0" promptText="Voornaam" />
<TextField fx:id="tfAchternaam" layoutX="125.0" layoutY="365.0" prefHeight="26.0" prefWidth="94.0" promptText="Achternaam" />
<TextField fx:id="tfStraat" layoutX="243.0" layoutY="365.0" prefHeight="26.0" prefWidth="150.0" promptText="Straat" />
<TextField fx:id="tfNummer" layoutX="396.0" layoutY="365.0" prefHeight="26.0" prefWidth="32.0" promptText="Nr" />
<TextField fx:id="tfPostcode" layoutX="431.0" layoutY="365.0" prefHeight="26.0" prefWidth="60.0" promptText="Postcode" />
<TextField fx:id="tfGemeente" layoutX="494.0" layoutY="365.0" prefHeight="26.0" prefWidth="130.0" promptText="Gemeente" />
<Button fx:id="btnKlantToevoegen" layoutX="635.0" layoutY="365.0" mnemonicParsing="false" prefHeight="26.0" prefWidth="93.0" text="Toevoegen" />
</children>
</AnchorPane>
</content>
</Tab>
<Tab closable="false" text="Uitleningen">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<TableView fx:id="tblUitleningen" layoutX="14.0" layoutY="14.0" prefHeight="343.0" prefWidth="714.0">
<columns>
<TableColumn prefWidth="92.0" text="Klant ID" />
<TableColumn prefWidth="324.0" text="Item ID" />
<TableColumn prefWidth="155.0" text="Start Uitleen" />
<TableColumn prefWidth="142.0" text="Eind Uitleen" />
</columns>
</TableView>
<ChoiceBox fx:id="cbItems" layoutX="15.0" layoutY="364.0" prefHeight="26.0" prefWidth="185.0" />
<ChoiceBox fx:id="cbKlanten" layoutX="244.0" layoutY="364.0" prefHeight="26.0" prefWidth="203.0" />
<Button fx:id="btnRegistreer" layoutX="497.0" layoutY="364.0" mnemonicParsing="false" prefHeight="26.0" prefWidth="229.0" text="Registreer Uitlening" />
</children>
</AnchorPane>
</content>
</Tab>
</tabs>
</TabPane>
</children>
</AnchorPane>
答案 0 :(得分：1)
查看JavaDoc您会发现：
public static <E> ObservableList<E> observableArrayList(Collection<? extends E> col)创建一个新的可观察数组列表，并向其添加集合col的内容。
事实上，您正在创建一个新的ObservableList并向其添加初始项目。最简单的解决方案是让ItemsLijst拥有ObservableList，并将其返回getItems。那你应该只做
tblItems.setItems(ItemsLijst.getItems()); // I corrected the class name