Java 每次单击choicebox时都会出现错误

我创建了一个名为

backgroundChoiceBox

的

ChoiceBox

对象。我在控制器类中添加了以下代码：

@FXML
private ChoiceBox<String> backgroundChoiceBox = new ChoiceBox<>();

当我运行程序时，选择框出现，没有错误被发送到控制台。但是，当我单击选择框时，我收到以下错误

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: argument type mismatch
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(Unknown Source)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
    at javafx.event.Event.fireEvent(Unknown Source)
    at javafx.scene.Scene$ClickGenerator.postProcess(Unknown Source)
    at javafx.scene.Scene$ClickGenerator.access$8100(Unknown Source)
    at javafx.scene.Scene$MouseHandler.process(Unknown Source)
    at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source)
    at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(Unknown Source)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
    at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
    at com.sun.glass.ui.View.notifyMouse(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

---

我对树和山的选项仍然会显示，并允许我单击它们，但它会导致出现相同的错误序列。如果有人能解释为什么会发生这种情况，那就太好了！提前感谢

您的

ChoiceBox

的初始化应该由您的FXML文件处理

例如：

<ChoiceBox fx:id="backgroundChoiceBox" value="Trees">
    <items>
        <FXCollections fx:factory="observableArrayList">
            <String fx:value="Trees" />
            <String fx:value="Mountains" />
        </FXCollections>
    </items>
</ChoiceBox>

---

从您的初始化方法。之后，您的

choiceAction

方法应该可以正常工作。

您的FXML文件中是否有关于此ChoiceBox的内容？如果是，请分享。我怀疑以下原因导致您的错误，但

=new ChoiceBox（）@FXML

声明变量的code>是。上面的代码对我来说很好（使用JavaFX8）@Moh-Aw是的，我有这行代码：它仍然不起作用

<ChoiceBox fx:id="backgroundChoiceBox" value="Trees">
    <items>
        <FXCollections fx:factory="observableArrayList">
            <String fx:value="Trees" />
            <String fx:value="Mountains" />
        </FXCollections>
    </items>
</ChoiceBox>

backgroundChoiceBox.getItems().addAll("Trees", "Mountains");
backgroundChoiceBox.setValue("Trees");