从JList中删除项目
我有一个包含List数据的简单Jlist，现在我想从Jlist中删除所选项目。 这是代码：
final DefaultListModel model = new DefaultListModel(); final JList list = new JList(model); //filling list //loop for every element from List public static void sample(DefaultListModel model, List data) for(int i=;i<data.size();i++) {model.addElement(data.get(i));} //btn pressed public void actionPerformed(ActionEvent arg0) { int index = list.getSelectedIndex(); model.removeElementAt(index); }
我收到此错误：
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.elementData(Unknown Source) at java.util.ArrayList.get(Unknown Source) at javax.swing.JList.fireSelectionValueChanged(Unknown Source) at javax.swing.JList$ListSelectionHandler.valueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.removeIndexInterval(Unknown Source) at javax.swing.plaf.basic.BasicListUI$Handler.intervalRemoved(Unknown Source) at javax.swing.AbstractListModel.fireIntervalRemoved(Unknown Source) at javax.swing.DefaultListModel.remove(Unknown Source) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$000(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)
是诀窍还是什么？ 感谢帮助。
假设您的索引是非负的（如其他人所述），请查看是否有效（在您的监听器中）：
((DefaultListModel) jList.getModel()).remove(index);
如果是这样，那么你正在使用陈旧的模型。
根据getSelectedIndex()的Javadoc：
返回最小的选定单元格索引; 在列表中仅选择单个项目时的选择。 选择多个项目时，它只是选择的最小索引。 如果没有选择，则返回-1
您遇到错误的原因是由于某种原因，您的列表中没有选择任何项目，因此此方法返回-1。 当你调用removeElementAt()并将它作为参数值传递给它时，它会抛出exception。
你需要做的是如下：
public void actionPerformed(ActionEvent arg0) { int index = list.getSelectedIndex(); if(index >= 0){ //Remove only if a particular item is selected model.removeElementAt(index); } }
根据javadoc ，建议使用remove()而不是removeElementAt() ，因此：
public void actionPerformed(ActionEvent arg0) { int index = list.getSelectedIndex(); if (index != -1) { model.remove(index); }
问题是您在侦听器中遇到问题，因为删除该元素时，所选值将更改。 这就是你的“valueChanged”方法试图将selectedValue置于错误位置的原因。 我看不到你的方法valueChanged，但我认为这就是原因。
DefaultListModel model=new DefaultListModel(); model.clear(); jList1.setModel(model);
如果你想删除所有项目