【发布时间】：2017-02-22 00:22:25
【问题描述】：
好的，我一直在解决这个程序的一些问题，我想我终于明白了哪里出了问题。我正在尝试稍微遵循本教程：http://docs.oracle.com/javafx/2/fxml_get_started/fxml_tutorial_intermediate.htm 但我的程序在与表视图不同的 FXML 页面上添加了一行。我认为该程序无法将两者连接起来。我已经研究过试图找到让他们互相交谈的方法（把所有东西都放在一个控制器中但它不喜欢它，尝试通过类传递控制器但没有用{可能做错了尽管}）。我的程序中还有整数和双精度数，这在该教程中没有涉及，所以我尝试自己解决这些问题（可能比我做的更好）。
但现在我只专注于弄清楚它为什么一直在思考
data = partTable.getItems();
为空（AddPartController 中的第 77 行）。任何帮助或其他 FXML/JavaFX 教程将不胜感激（尽管我已经看过很多）。
FXMLDocument.fxml（主页）
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.control.cell.*?>
<?import javafx.collections.*?>
<?import fxmltableview.*?>
<?import ims.Part?>
<?import ims.Inhouse?>
<?import ims.Outsourced?>
<BorderPane id="main" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ims.FXMLDocumentController" >
<top>
<Label fx:id="mainTitle" text="Inventory Management System" />
</top>
<center>
<HBox fx:id="holding">
<children>
<VBox styleClass="contentBox">
<children>
<HBox styleClass="topBox">
<HBox styleClass="subHeading">
<Label text="Parts" />
</HBox>
<HBox styleClass="searchBox">
<Button text="Search" />
<TextField />
</HBox>
</HBox>
<TableView fx:id="partTable" styleClass="dataTable">
<columns>
<TableColumn text="Part ID">
<cellValueFactory>
<PropertyValueFactory property="id" />
</cellValueFactory>
</TableColumn>
<TableColumn fx:id="nameColumn" text="Part Name">
<cellValueFactory>
<PropertyValueFactory property="name" />
</cellValueFactory>
</TableColumn>
<TableColumn text="Inventory Level">
<cellValueFactory>
<PropertyValueFactory property="instock" />
</cellValueFactory>
</TableColumn>
<TableColumn text="Price/Cost per Unit">
<cellValueFactory>
<PropertyValueFactory property="price" />
</cellValueFactory>
</TableColumn>
</columns>
<items>
<FXCollections fx:factory="observableArrayList">
<Inhouse name="Part 1" price="5.00" instock="5" max="10" min="1" />
<Inhouse name="Part 2" price="7.00" instock="2" max="11" min="2" />
</FXCollections>
</items>
<sortOrder>
<fx:reference source="nameColumn" />
</sortOrder>
</TableView>
<HBox styleClass="modificationButtons">
<children>
<Button onAction="#addPart" text="Add" />
<Button onAction="#modifyPart" text="Modify" />
<Button text="Delete" />
</children>
</HBox>
</children>
</VBox>
<VBox styleClass="contentBox">
<children>
<HBox styleClass="topBox">
<HBox styleClass="subHeading">
<Label text="Products" />
</HBox>
<HBox styleClass="searchBox">
<Button text="Search" />
<TextField />
</HBox>
</HBox>
<TableView fx:id="productTable" styleClass="dataTable">
<columns>
<TableColumn text="Part ID" />
<TableColumn text="Part Name" />
<TableColumn text="Inventory Level" />
<TableColumn text="Price/Cost per Unit" />
</columns>
</TableView>
<HBox styleClass="modificationButtons">
<children>
<Button onAction="#addProduct" text="Add" />
<Button onAction="#modifyProduct" text="Modify" />
<Button text="Delete" />
</children>
</HBox>
</children>
</VBox>
</children>
</HBox>
</center>
<bottom>
<HBox fx:id="exitButton">
<children>
<Button onAction="#closeProgram" text="Exit" />
</children>
</HBox>
</bottom>
</BorderPane>
FXMLDocumentController
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package ims;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;
/**
*
* @author chelseacamper
*/
public class FXMLDocumentController implements Initializable {
@FXML
private Label label;
@FXML
private void addPart(ActionEvent event) throws IOException {
Parent add_part_parent = FXMLLoader.load(getClass().getResource("addPart.fxml"));
Scene add_part_scene = new Scene(add_part_parent);
add_part_scene.getStylesheets().add("style.css");
Stage app_stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
app_stage.setScene(add_part_scene);
app_stage.show();
}
@FXML
private void modifyPart(ActionEvent event) throws IOException {
Parent modify_part_parent = FXMLLoader.load(getClass().getResource("modifyPart.fxml"));
Scene modify_part_scene = new Scene(modify_part_parent);
modify_part_scene.getStylesheets().add("style.css");
Stage app_stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
app_stage.setScene(modify_part_scene);
app_stage.show();
}
@FXML
private void addProduct(ActionEvent event) throws IOException {
Parent add_product_parent = FXMLLoader.load(getClass().getResource("addProduct.fxml"));
Scene add_product_scene = new Scene(add_product_parent);
add_product_scene.getStylesheets().add("style.css");
Stage app_stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
app_stage.setScene(add_product_scene);
app_stage.show();
}
@FXML
private void modifyProduct(ActionEvent event) throws IOException {
Parent modify_product_parent = FXMLLoader.load(getClass().getResource("modifyProduct.fxml"));
Scene modify_product_scene = new Scene(modify_product_parent);
modify_product_scene.getStylesheets().add("style.css");
Stage app_stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
app_stage.setScene(modify_product_scene);
app_stage.show();
}
@FXML
private void closeProgram(ActionEvent event) throws IOException {
Stage app_stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
app_stage.close();
}
@Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
}
addPart.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.net.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<BorderPane id="addPage" xmlns:fx="http://javafx.com/fxml/1" fx:controller="ims.AddPartController">
<fx:define>
<ToggleGroup fx:id="inOutGroup" />
</fx:define>
<center>
<VBox fx:id="verticalHolding">
<children>
<HBox fx:id="topRow">
<Label text="Add Part"/>
<RadioButton fx:id="inhouse" toggleGroup="$inOutGroup" text="In-House"/>
<RadioButton fx:id="outsourced" toggleGroup="$inOutGroup" selected="true" text="Outsourced"/>
</HBox>
<HBox styleClass="fullWidth">
<HBox styleClass="halfWidthLeft">
<Label text="ID" />
</HBox>
<HBox styleClass="halfWidthRight">
<TextField promptText="Auto Gen - Disabled" />
</HBox>
</HBox>
<HBox styleClass="fullWidth">
<HBox styleClass="halfWidthLeft">
<Label text="Name" />
</HBox>
<HBox styleClass="halfWidthRight">
<TextField fx:id="partNameField" promptText="Part Name" />
</HBox>
</HBox>
<HBox styleClass="fullWidth">
<HBox styleClass="halfWidthLeft">
<Label text="Inv" />
</HBox>
<HBox styleClass="halfWidthRight">
<TextField fx:id="partInstockField" promptText="Inv" />
</HBox>
</HBox>
<HBox styleClass="fullWidth">
<HBox styleClass="halfWidthLeft">
<Label text="Price/Cost" />
</HBox>
<HBox styleClass="halfWidthRight">
<TextField fx:id="partPriceField" promptText="Price/Cost" />
</HBox>
</HBox>
<HBox styleClass="fullWidth">
<HBox styleClass="halfWidthLeft">
<Label text="Max" />
</HBox>
<HBox styleClass="halfWidthRight">
<TextField styleClass="smallTextField" fx:id="partMaxField" promptText="Max" />
<Label text="Min" />
<TextField styleClass="smallTextField" fx:id="partMinField" promptText="Min" />
</HBox>
</HBox>
<HBox styleClass="fullWidth">
<HBox styleClass="halfWidthLeft">
<Label fx:id="inhouseLabel" text="Machine ID" />
<Label fx:id="outsourcedLabel" text="Company Name" />
</HBox>
<HBox styleClass="halfWidthRight">
<TextField fx:id="inhouseTextField" promptText="Mach ID" />
<TextField fx:id="outsourcedTextField" promptText="Comp Nm" />
</HBox>
</HBox>
<HBox styleClass="fullWidth">
<HBox styleClass="halfWidthLeft">
</HBox>
<HBox styleClass="halfWidthRight">
<Button onAction="#addInhouse" text="Save" />
<Button onAction="#backToMain" text="Cancel" />
</HBox>
</HBox>
</children>
</VBox>
</center>
</BorderPane>
添加部件控制器
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package ims;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleButton;
import javafx.stage.Stage;
/**
* FXML Controller class
*
* @author chelseacamper
*/
public class AddPartController implements Initializable {
@FXML
ToggleButton inhouse;
@FXML
ToggleButton outsourced;
@FXML
Label inhouseLabel;
@FXML
Label outsourcedLabel;
@FXML
TextField inhouseTextField;
@FXML
TextField outsourcedTextField;
@FXML
private TableView<Inhouse> partTable;
@FXML
private TextField partNameField;
@FXML
private TextField partInstockField;
@FXML
private TextField partPriceField;
@FXML
private TextField partMaxField;
@FXML
private TextField partMinField;
/**
* Initializes the controller class.
* @param url
* @param rb
*/
@Override
public void initialize(URL url, ResourceBundle rb) {
inhouseLabel.visibleProperty().bind( inhouse.selectedProperty() );
outsourcedLabel.visibleProperty().bind( outsourced.selectedProperty() );
inhouseTextField.visibleProperty().bind( inhouse.selectedProperty() );
outsourcedTextField.visibleProperty().bind( outsourced.selectedProperty() );
inhouseLabel.managedProperty().bind( inhouse.selectedProperty() );
outsourcedLabel.managedProperty().bind( outsourced.selectedProperty() );
inhouseTextField.managedProperty().bind( inhouse.selectedProperty() );
outsourcedTextField.managedProperty().bind( outsourced.selectedProperty() );
}
@FXML
public void addInhouse(ActionEvent event){
ObservableList<Inhouse> data;
data = partTable.getItems();
data.add(new Inhouse(partNameField.getText(),
Integer.parseInt(partInstockField.getText()),
Double.parseDouble(partPriceField.getText()),
Integer.parseInt(partMaxField.getText()),
Integer.parseInt(partMinField.getText()),
Integer.parseInt(inhouseTextField.getText())
// Integer.parseInt(outsourcedTextField.getText())
));
partNameField.setText("");
partInstockField.setText(String.valueOf(partInstockField));
partPriceField.setText(String.valueOf(partPriceField));
partMaxField.setText(String.valueOf(partMaxField));
partMinField.setText(String.valueOf(partMinField));
inhouseTextField.setText(String.valueOf(inhouseTextField));
// outsourcedTextField.setText(String.valueOf(outsourcedTextField));
}
@FXML
private void backToMain(ActionEvent event) throws IOException {
Parent add_main_parent = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene add_main_scene = new Scene(add_main_parent);
add_main_scene.getStylesheets().add("style.css");
Stage app_stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
app_stage.setScene(add_main_scene);
app_stage.show();
}
}
单击添加然后保存时出现的错误（甚至不必输入内容）
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1770)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1653)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8390)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3758)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3486)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2495)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:350)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(GlassViewEventHandler.java:385)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$294/109927940.get(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:404)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:384)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:927)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1765)
... 46 more
Caused by: java.lang.NullPointerException
at ims.AddPartController.addInhouse(AddPartController.java:77)
... 56 more
【问题讨论】：
标签： javafx javafx-2 javafx-8 fxml