由于某种原因，每当我添加一个将切换场景的按钮时，我都会不断出错。我一生无法理解错误在做什么。当我尝试初始化组合框时也会发生这种情况。我已经坚持了很长时间，开始怀疑我是否在其他地方错过了错误
enter image description here 错误。
FirstPage.fxml代码
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<AnchorPane prefHeight="518.0" prefWidth="708.0" xmlns="http://javafx.com/javafx/8.0.121" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.FilmsController">
<children>
<Button fx:id="mainpagebutton" layoutX="86.0" layoutY="154.0" mnemonicParsing="false" onAction="#startpage" text="Start Button" />
<Button layoutX="41.0" layoutY="-114.0" mnemonicParsing="false" text="Button" />
<HBox layoutX="-166.0" layoutY="-137.0" prefHeight="123.0" prefWidth="474.0" />
</children>
</AnchorPane>
主页
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("FirstPage.fxml"));
primaryStage.setTitle("");
primaryStage.setScene(new Scene(root, 708, 518));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
FilmsController页面
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.Window;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.ResourceBundle;
public class FilmsController implements Initializable{
private ArrayList<String> filmtitles = new ArrayList<>();
private ArrayList<Films> films = new ArrayList<>();
@FXML
public Button receiptbut;
@FXML
public ComboBox<String> filmcombobox;
@FXML
public Button mainpagebutton;
@FXML
private Button leavepagebutton;
ObservableList<String> olfilmtitles = FXCollections.observableArrayList(
"Matrix", "Avatar", "Incredibles", "The Grinch", "Harry Potter", "Ice Age", "Home Alone",
"E.T.","Shrek", "Wonder"
);
public FilmsController() {
Films matrix = new Films("Matrix", 5, 15, 120, "2:30");
films.add(matrix);
}
public void drinksPopUpStage(ActionEvent actionEvent) throws IOException{
Scene drinksscene = new Scene(FXMLLoader.load(getClass().getResource("../FXMLfolder/Drinks.fxml")));
Stage Drinks = new Stage();
Drinks.setScene(drinksscene);
Drinks.initModality(Modality.APPLICATION_MODAL);
Drinks.show();
}
public void snacksPopUpStage(ActionEvent actionEvent) throws IOException{
Scene snacksscene = new Scene(FXMLLoader.load(getClass().getResource("../FXMLfolder/Snacks.fxml")));
Stage Snacks = new Stage();
Snacks.setScene(snacksscene);
Snacks.initModality(Modality.APPLICATION_MODAL);
Snacks.show();
}
public void changetitle(ActionEvent actionEvent) {
}
/* public ObservableList<String> getFilmtitles() {
for (Films film : films) {
filmtitles.add(film.getName());
}
ObservableList<String> olfilmtitles = FXCollections.observableArrayList(filmtitles);
return olfilmtitles;
}*/
@Override
public void initialize(URL location, ResourceBundle resources) {
filmcombobox.setItems(olfilmtitles);
}
@FXML
public void receipt(ActionEvent actionEvent) throws IOException{
Window mainWindow = receiptbut.getScene().getWindow();
Parent newRoot = FXMLLoader.load(getClass().getResource("Receiptpage.fxml"));
mainWindow.getScene().setRoot(newRoot);
}
@FXML
public void startpage(ActionEvent actionEvent) throws IOException{
Window mainWindow = mainpagebutton.getScene().getWindow();
Parent newRoot = FXMLLoader.load(getClass().getResource("Maincinema.fxml"));
mainWindow.getScene().setRoot(newRoot);
}
}
错误
Exception in Application start method
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:498)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
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:498)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: javafx.fxml.LoadException:
/C:/Users/hamza/IdeaProjects/CinemaEnterprisoFinal/out/production/CinemaEnterprisoFinal/sample/FirstPage.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at sample.Main.start(Main.java:13)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
... 1 more
Caused by: java.lang.NullPointerException
at sample.FilmsController.initialize(FilmsController.java:77)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 17 more
Exception running application sample.Main
MainCinema.fxml代码（包含组合框（filmcombbox））
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.text.Font?>
<AnchorPane prefHeight="518.0" prefWidth="708.0" xmlns="http://javafx.com/javafx/8.0.121" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.FilmsController">
<children>
<HBox layoutX="235.0" prefHeight="129.0" prefWidth="283.0">
<children>
<Label prefHeight="131.0" prefWidth="285.0" text="Cinema Enterpriso">
<font>
<Font name="Cambria Math" size="34.0" />
</font>
</Label>
</children></HBox>
<ComboBox fx:id="filmcombobox" layoutX="18.0" layoutY="103.0" prefHeight="36.0" prefWidth="157.0" promptText="Pick a Film" />
<Label layoutX="22.0" layoutY="42.0" text="What's On">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Label>
<Button fx:id="snacksbut" layoutX="293.0" layoutY="367.0" mnemonicParsing="false" prefHeight="45.0" prefWidth="84.0" text="Snacks">
<font>
<Font name="Cambria" size="18.0" />
</font>
</Button>
<Button layoutX="293.0" layoutY="428.0" mnemonicParsing="false" prefHeight="45.0" prefWidth="84.0" text="Drinks">
<font>
<Font name="Cambria" size="18.0" />
</font>
</Button>
<Label layoutX="14.0" layoutY="198.0" text="Price">
<font>
<Font name="Cambria" size="19.0" />
</font>
</Label>
<TextField editable="false" layoutX="56.0" layoutY="197.0" />
<TextField layoutX="14.0" layoutY="309.0" prefHeight="25.0" prefWidth="42.0" />
<TextField layoutX="130.0" layoutY="309.0" prefHeight="25.0" prefWidth="42.0" />
<Label layoutX="14.0" layoutY="259.0" prefHeight="52.0" prefWidth="104.0" text="No. of Adults">
<font>
<Font name="Cambria" size="17.0" />
</font>
</Label>
<Label layoutX="126.0" layoutY="259.0" prefHeight="52.0" prefWidth="120.0" text="No. of Children">
<font>
<Font name="Cambria" size="17.0" />
</font>
</Label>
<Label layoutX="22.0" layoutY="363.0" prefHeight="52.0" prefWidth="104.0" text="Total price">
<font>
<Font name="Cambria" size="17.0" />
</font>
</Label>
<TextField editable="false" layoutX="22.0" layoutY="415.0" />
<ComboBox layoutX="494.0" layoutY="129.0" prefHeight="36.0" prefWidth="150.0" promptText="Pick a Seat" />
<ListView layoutX="494.0" layoutY="169.0" prefHeight="179.0" prefWidth="170.0" />
<Button fx:id="leavepagebutton" layoutX="22.0" layoutY="468.0" mnemonicParsing="false" onAction="#leavepage" prefHeight="25.0" prefWidth="131.0" text="Back To Homepage" />
<Button fx:id="receiptbut" layoutX="596.0" layoutY="468.0" mnemonicParsing="false" onAction="#receipt" prefHeight="25.0" prefWidth="104.0" text="Finish & Pay" />
</children>
</AnchorPane>
答案 0 :(得分：0)
为新按钮添加ID：离开页面按钮
<Button fx:id="leavepagebutton" layoutX="41.0" layoutY="-114.0" mnemonicParsing="false" text="Button" />