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我创建了一个ChoiceBox名为backgroundChoiceBox. 我将以下代码添加到我的控制器类中：

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

在初始化方法中，我添加了这两行代码：

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

当我运行程序时，会出现选择框，并且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)

我的 Trees 和 Mountains 选项仍然显示并允许我单击它们，但它会导致出现相同的错误序列。如果有人可以帮助解释为什么会发生这种情况，那就太好了！提前致谢

4

1 回答 1

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您的初始化ChoiceBox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>

您当前正在初始化您的ChoiceBox两次。一次在 FXML 文件中，一次在控制器中。

从= new ChoiceBox<>();您的控制器类中删除并删除相应的

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

从你的初始化方法。之后，您的choiceAction方法应该毫无例外地工作。

于 2016-04-04T06:17:11.277 回答