Java 尝试取消选择TableView中的选定行时发生IndexOutOfBoundsException

我有一个

TableView-courseTableView

，它存储了几个

Course

对象

我还有一个方法

selectCourse（）

，它允许人们点击一行并将有关各个课程的信息发送到

TextField-courseName

，允许对其进行修改

但是，当我尝试使用

courseTableView.getSelectionModel（）.clearSelection（）取消选择所选行时，我得到一个IndexOutOfBoundsException

以下是整个错误消息：

Exception in thread "JavaFX Application Thread" java.lang.IndexOutOfBoundsException
    at javafx.base/javafx.collections.transformation.SortedList.get(SortedList.java:168)
    at javafx.controls/com.sun.javafx.scene.control.SelectedCellsMap.get(SelectedCellsMap.java:77)
    at javafx.controls/javafx.scene.control.TableView$TableViewArrayListSelectionModel$3.get(TableView.java:2121)
    at javafx.controls/javafx.scene.control.TableView$TableViewArrayListSelectionModel$3.get(TableView.java:2119)
    at Interface.ManageData$1.onChanged(ManageData.java:202)
    at javafx.base/com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:329)
    at javafx.base/com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)
    at javafx.base/javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:233)
    at javafx.controls/com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList.callObservers(ReadOnlyUnbackedObservableList.java:110)
    at javafx.controls/javafx.scene.control.TableView$TableViewArrayListSelectionModel.fireCustomSelectedCellsListChangeEvent(TableView.java:3033)
    at javafx.controls/javafx.scene.control.TableView$TableViewArrayListSelectionModel.clearSelection(TableView.java:2803)
    at Interface.ManageData.unselectCourse(ManageData.java:210)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
    at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:273)
    at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
    at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1784)
    at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8890)
    at javafx.controls/javafx.scene.control.Button.fire(Button.java:203)
    at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
    at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3862)
    at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
    at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2590)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.ja**va:446)
    at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
    at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    at java.base/java.lang.Thread.run(Thread.java:830)

但即使我得到了这个错误，代码仍然会执行，并且行被取消选择。
以下是
selectCourse（）

和
取消选择课程（）
（临时绑定到“删除”按钮）

我相信问题在于
selectCourse（）
方法，但我无法找到解决方案

谢谢大家!
 您可能需要更改ListChangeListener，以便它在选择第一项之前检查所选内容是否为空

selectedCells.addListener(new ListChangeListener() {
  @Override
  public void onChanged(Change c) {
    if(!selectedCells.isEmpty()) {
    TablePosition tablePosition = (TablePosition) selectedCells.get(0);
    Object val = tablePosition.getTableColumn().getCellData(tablePosition.getRow());
    courseName.setText(val.toString());
  }
}
});

“我相信问题在于
selectCourse（）
”。您的堆栈跟踪不是这样写的：
位于Interface.ManageData.unselectCourse（ManageData.java:210）
。错误似乎出现在更改后的
中，最有可能出现在这里：
selectedCells.get（0）请将您的问题添加到演示问题的列表中。另见。尽管如此，Costi可能是对的，调用
get（0）
就是问题所在。您已将列表更改侦听器注册到选择模型，清除列表（使列表为空），然后在尝试检索它之前无法检查索引
0
处是否有元素。您是正确的，谢谢。我通过将它包装在
if（selectedCells.size（）>0）
中修复了它。另外需要注意的是：每次调用
#selectCourse（）
时，都会添加一个新的
ListChangeListener
；这将导致越来越多的侦听器在修改列表时执行相同的操作。
 public void unselectCourse(){
    courseTableView.getSelectionModel().clearSelection();
  }

selectedCells.addListener(new ListChangeListener() {
  @Override
  public void onChanged(Change c) {
    if(!selectedCells.isEmpty()) {
    TablePosition tablePosition = (TablePosition) selectedCells.get(0);
    Object val = tablePosition.getTableColumn().getCellData(tablePosition.getRow());
    courseName.setText(val.toString());
  }
}
});