76 歳で、私は Java を学ぼうとしており、シーンを変えることに成功した会計関連のチュートリアルを数多く作成しました。ここで、メニューバーの項目の 1 つとして 14 のチャプターをリンクすることに対応するために、メニューバーとメニュー項目を使用する構造を検討します。
私が見た/見たすべての例は、単純なprintlnfor each を示していますMenuItem。これで問題なく動作していますが、以前のアプリケーションからコピーしようとすると、気に入りFXMLLoaderません。
これはシンボルを見つけることができません：symbol: method getScene() location: variable mbarchapter1 of type MenuItem
私のコードは次のとおりです。
package accountingsnapshots;
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.Parent;
import javafx.scene.Scene;
import javafx.scene.control.MenuItem;
import javafx.stage.Stage;
public class AccountingSnapshotsController implements Initializable {
@FXML
private MenuItem mbarhome;
@FXML
private MenuItem mbarchapter1;
@FXML
private MenuItem mbarchapter2;
@FXML
private MenuItem mbarchapter3;
@FXML
private MenuItem mbarchapter4;
@FXML
private MenuItem mbarcalculator;
@FXML
private MenuItem mbarglossary;
@FXML
private MenuItem mbarhelp;
Stage stage;
@FXML Parent root;
@FXML
private void handleButtonAction(ActionEvent e) throws IOException {
if(e.getSource()==mbarhome){
System.out.println("this is Home");
}
else if(e.getSource()==mbarchapter1){
System.out.println("this is chap 1");
//get reference to the button's stage
stage = (Stage) root.getScene().getWindow();
//load up OTHER FXML document
root = FXMLLoader.load(getClass().getResource("AccountingSnapshots_1.fxml"));
//create a new scene with root and set the stage
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
else if(e.getSource()==mbarchapter2){
System.out.println("this is chap 2");
}
else if(e.getSource()==mbarchapter3){
System.out.println("this is chap 3");
}
else if(e.getSource()==mbarchapter4){
System.out.println("this is chap 4");
}
else if(e.getSource()==mbarcalculator){
System.out.println("this is Calculator");
}
else if(e.getSource()==mbarglossary){
System.out.println("this is Glossary");
}
else if(e.getSource()==mbarhelp){
System.out.println("this is Help");
}
}
@Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
}
FXML ファイルには、menuItems に対する fx:ids があります。下に示された：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="600.0" prefWidth="800.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="accountingsnapshots.AccountingSnapshotsController">
<children>
<MenuBar layoutY="-1.0" prefHeight="30.0" prefWidth="858.0">
<menus>
<Menu fx:id="mbarhome" mnemonicParsing="false" onAction="#handleButtonAction" text="Home">
<items>
<MenuItem mnemonicParsing="false" text="Home" />
</items>
</Menu>
<Menu mnemonicParsing="false" text="Chapters">
<items>
<MenuItem fx:id="mbarchapter1" mnemonicParsing="false" onAction="#handleButtonAction" text="Ch.1 - Introduction to final accounts" />
<MenuItem fx:id="mbarchapter2" mnemonicParsing="false" onAction="#handleButtonAction" text="Ch.2 - Double entry bookkeeping" />
<MenuItem fx:id="mbarchapter3" mnemonicParsing="false" onAction="#handleButtonAction" text="Ch.3 - Accounting adjustments" />
<MenuItem fx:id="mbarchapter4" mnemonicParsing="false" onAction="#handleButtonAction" text="Ch.4 - Introduction to final accounts" />
</items>
</Menu>
<Menu fx:id="mbarcalculator" mnemonicParsing="false" onAction="#handleButtonAction" text="Calculator">
<items>
<MenuItem mnemonicParsing="false" text="Calculator" />
</items>
</Menu>
<Menu fx:id="mbarglossary" mnemonicParsing="false" onAction="#handleButtonAction" text="Glossary">
<items>
<MenuItem mnemonicParsing="false" text="Glossary" />
</items>
</Menu>
<Menu fx:id="mbarhelp" mnemonicParsing="false" onAction="#handleButtonAction" text="Help">
<items>
<MenuItem mnemonicParsing="false" text="Help" />
</items>
</Menu>
</menus>
</MenuBar>
</children>
</AnchorPane>
これは、アプリケーションを実行したときの出力です。
Created dir: C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\build\empty
Created dir: C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\build\generated-sources\ap-source-output
Compiling 2 source files to C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\build\classes
Copying 5 files to C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\build\classes
compile:
Created dir: C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\dist
Detected JavaFX Ant API version 1.3
Launching <fx:jar> task from C:\Program Files\Java\jdk1.8.0_31\jre\..\lib\ant-javafx.jar
Warning: From JDK7u25 the Codebase manifest attribute should be used to restrict JAR repurposing.
Please set manifest.custom.codebase property to override the current default non-secure value '*'.
Launching <fx:deploy> task from C:\Program Files\Java\jdk1.8.0_31\jre\..\lib\ant-javafx.jar
jfx-deployment-script:
jfx-deployment:
jar:
Copying 12 files to C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\dist\run53408212
jfx-project-run:
Executing C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\dist\run53408212\AccountingSnapshots.jar using platform C:\Program Files\Java\jdk1.8.0_31\jre/bin/java
this is chap 1
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1762)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1645)
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.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
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.control.MenuItem.fire(MenuItem.java:462)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(ContextMenuContent.java:1364)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.lambda$createChildren$324(ContextMenuContent.java:1317)
at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer$$Lambda$147/1926554713.handle(Unknown Source)
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.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:3724)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382)
at com.sun.glass.ui.View.handleMouseEvent(View.java:553)
at com.sun.glass.ui.View.notifyMouse(View.java:925)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda$37/96639997.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1757)
... 43 more
Caused by: javafx.fxml.LoadException:
file:/C:/Users/john/Documents/NetBeansProjects/AccountingSnapshots/dist/run53408212/AccountingSnapshots.jar!/accountingsnapshots/AccountingSnapshots_1.fxml:16
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2595)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2573)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2435)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3208)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3169)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3142)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3118)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3098)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3091)
at accountingsnapshots.AccountingSnapshotsController.handleButtonAction(AccountingSnapshotsController.java:53)
... 53 more
Caused by: java.lang.IllegalArgumentException: Unable to coerce MenuButton@35398aab[styleClass=menu-button]'Home' to class javafx.scene.control.MenuItem.
at com.sun.javafx.fxml.BeanAdapter.coerce(BeanAdapter.java:495)
at javafx.fxml.FXMLLoader$PropertyElement.add(FXMLLoader.java:1387)
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:784)
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2817)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2526)
... 61 more
2 番目の .fxml ファイルを修正し、MenuButton を MenuItem に変更しました。出力セクションの結果は次のとおりです。
ant -f C:\\Users\\john\\Documents\\NetBeansProjects\\AccountingSnapshots jfxsa-run
init:
Deleting: C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\build\built-jar.properties
deps-jar:
Updating property file: C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\build\built-jar.properties
compile:
Detected JavaFX Ant API version 1.3
jfx-deployment:
jar:
Copying 12 files to C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\dist\run581163156
jfx-project-run:
Executing C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\dist\run581163156\AccountingSnapshots.jar using platform C:\Program Files\Java\jdk1.8.0_31\jre/bin/java
this is chap 1
Deleting directory C:\Users\john\Documents\NetBeansProjects\AccountingSnapshots\dist\run581163156
jfxsa-run:
BUILD SUCCESSFUL (total time: 19 seconds)
どんな助けでも大歓迎