JAVAFX：Stage.show（）の後に関数を実行するには？

Question

私はコードが初期化される前に実行される問題に苦しんでいます。

@FXML 
    public void Start(int pesel) throws IOException { 
     klientPesel = pesel; 
     root = FXMLLoader.load(getClass().getClassLoader().getResource("klientScene.fxml")); 
     Main.mainStage.setTitle("Agencja Ubezpieczniowa - Agent"); 
     Scene scene = new Scene(root,800,600); 
     Main.mainStage.setScene(scene); 
     Main.mainStage.show(); 
     obtainKlient(); 
     setKlientLabels(); 
    } 

ので、正確な問題は、私は、変数@FXML private VBox KlientInfoVBOX;を持っており、それがsetKlientLabels()実行する前に初期化されていないということです。 Main.mainStage.show();の後にsetKlientLabels()が実行されるようにするにはどうすればよいですか？私は例外がない実行するためのコードからsetKlientLabels()を削除した場合

Mabeyのスタックトレースが問題

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException 
    at app.KlientSearchController.setKlientLabels(KlientSearchController.java:69) 
    at app.KlientSearchController.Start(KlientSearchController.java:51) 
    at app.UserSceneController.StartKlientSearch(UserSceneController.java:87) 
    at app.UserSceneController.lambda$wyszukajKlienta$0(UserSceneController.java:70) 
    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$MouseEventNotification.run(GlassViewEventHandler.java:352) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388) 
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387) 
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555) 
    at com.sun.glass.ui.View.notifyMouse(View.java:937) 
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) 
    at java.lang.Thread.run(Thread.java:745) 

を解決するのに役立ちます、eveyrhtingはsmoothily実行されます。

Answer 1

StageのonShowingProperty()を設定する必要があります。ステージが表示されたら、onShowingProperty()が解雇されます。 onShowingProperty()を設定するには、単にsetOnShowing()メソッドを使用します。

Main.mainStage.setOnShowing(new EventHandler<WindowEvent>() { 
    @Override 
    public void handle(WindowEvent event) { 
     setKlientLabels(); 
    } 
}); 
Main.mainStage.show(); 

Answer 2

問題は、私は@FXML private VBox KlientInfoVBOX;に私のrefrenceがnullだったので、地雷を作成し、AFTER FXMLは、オブジェクトの独自のインスタンスを作成していたということでした。私はstatic VBOX klientInfoVBOXを作成し、Googleで「タスクjava8」について

public void initialize(){ 
     if(KlientInfoVBOX != null) { 
      klientInfoVBOX = KlientInfoVBOX; 
     } 
    }