私は、どのような種類の電子デバイスを使用して、必要なソーラーパネルとバッテリーがどれくらいあるかをユーザーに尋ねるプロジェクトを持っています。JavaFXのGridPaneのTextAreaからのテキストの取得
情報を収集するために、私はTextAreaと可変数の行がある3つの列を持つgridPaneを使用します。 gridPaneの2行目と3行目に情報を収集する必要があります。
私はここで尋ねた別の質問で見つけた次の方法を使用します。
private void calculer(ActionEvent event)
{
double ampApp = 0;
double heureApp = 0;
double wattTotal = 0;
double nbJourAuto;
double heureSoleil;
int nbPanneau;
int nbBatterie;
String stringTemp;
for(int i =1; i < rangee; i++)
{
stringTemp = getNodeByRowColumnIndex(i, 1, gridApp).toString();
ampApp += parseDouble(stringTemp);
}
for(int i =1; i < rangee; i++)
{
stringTemp = getNodeByRowColumnIndex(i, 2, gridApp).toString();
heureApp += parseDouble(stringTemp);
}
(それは私が "}" 行方不明がある知っている、方法の最初の部分のみです)
そして、ここではgetNodeByRowColumnIndexコードです:私はこの方法を試してみました
public Node getNodeByRowColumnIndex(final int row, final int column, GridPane gridPane) {
Node result = null;
ObservableList<Node> childrens = gridPane.getChildren();
for(Node node : childrens)
{
if(gridPane.getRowIndex(node) == row && gridPane.getColumnIndex(node) == column)
{
result = node;
break;
}
}
return result;
}
、 java.lang.NullPointerExceptionを取得し続ける
誰もがこの問題を解決する方法を知っていますか?
編集:
ここで要求されたスタックトレース
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
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:8411)
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$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 48 more
Caused by: java.lang.NullPointerException
at systemesolaire.FXMLDocumentController.getNodeByRowColumnIndex(FXMLDocumentController.java:111)
at systemesolaire.FXMLDocumentController.calculer(FXMLDocumentController.java:81)
... 58 more
だとここで私は私の子供(私はFXMLファイルをSceneBuilderので、ここで使用されている)、ここで
<content>
<GridPane fx:id="gridApp" prefHeight="141.0" prefWidth="452.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" maxWidth="226.0" minWidth="10.0" prefWidth="226.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="146.0" minWidth="10.0" prefWidth="123.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="113.0" minWidth="10.0" prefWidth="103.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="40.0" prefHeight="40.0" vgrow="NEVER" />
<RowConstraints minHeight="40.0" prefHeight="40.0" vgrow="NEVER" />
<RowConstraints minHeight="40.0" prefHeight="40.0" vgrow="NEVER" />
</rowConstraints>
<children>
<Label text=" Nom de l'appareil">
<font>
<Font name="Anke" size="18.0" />
</font>
</Label>
<Label text="Ampérage" GridPane.columnIndex="1">
<font>
<Font name="Anke" size="14.0" />
</font>
</Label>
<Label text="Heures utilisation" GridPane.columnIndex="2">
<font>
<Font name="Anke" size="13.0" />
</font>
</Label>
<TextArea prefHeight="200.0" prefWidth="200.0" promptText="Nom" GridPane.rowIndex="1" />
<TextArea prefHeight="200.0" prefWidth="200.0" promptText="Amp" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<TextArea prefHeight="200.0" prefWidth="200.0" promptText="Heure" GridPane.columnIndex="2" GridPane.rowIndex="1" />
<TextArea prefHeight="200.0" prefWidth="200.0" promptText="Nom" GridPane.rowIndex="2" />
<TextArea prefHeight="200.0" prefWidth="200.0" promptText="Amp" GridPane.columnIndex="1" GridPane.rowIndex="2" />
<TextArea prefHeight="200.0" prefWidth="200.0" promptText="Heure" GridPane.columnIndex="2" GridPane.rowIndex="2" />
</children>
</GridPane>
</content>
とをintialize方法ですと私のグリッドパネルに行を追加する方法
@FXML
private void ajouteRangee(ActionEvent event)
{
TextArea nom = new TextArea();
TextArea amp = new TextArea();
TextArea heure = new TextArea();
nom.setPromptText("Nom");
amp.setPromptText("Amp");
heure.setPromptText("heure");
gridApp.addRow(rangee, nom, amp, heure);
gridApp.layout();
rangee++;
}
をコンポーネントを初期化するか?コンポーネントをGridPaneに追加するか...)。NullPointerにその子を渡すと仮定します。初期化されていません。 – GOXR3PLUS
[NullPointerExceptionとは何か、それを修正する方法は?](http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) ) – fabian
スタックトレースを追加しました – MrDjEnjoy