java - java swing 应用程序中的未知错误

Question

您好，我使用第二个线程每 2 秒更新一次 JTable 的 DefaultTableModel，显然是随机的，它会抛出以下错误。

    Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 2 >= 2    at java.util.Vector.elementAt(Vector.java:470)    at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:649)    at javax.swing.JTable.getValueAt(JTable.java:2716)    at javax.swing.JTable.prepareRenderer(JTable.java:5714)    at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2108)    at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2010)    at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1806)    at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)    at javax.swing.JComponent.paintComponent(JComponent.java:769)    at javax.swing.JComponent.paint(JComponent.java:1045)    at javax.swing.JComponent.paintChildren(JComponent.java:878)    at javax.swing.JComponent.paint(JComponent.java:1054)    at javax.swing.JViewport.paint(JViewport.java:731)    at javax.swing.JComponent.paintChildren(JComponent.java:878)    at javax.swing.JComponent.paint(JComponent.java:1054)    at javax.swing.JComponent.paintToOffscreen(JComponent.java:5212)    at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:295)    at javax.swing.RepaintManager.paint(RepaintManager.java:1236)    at javax.swing.JComponent._paintImmediately(JComponent.java:5160)    at javax.swing.JComponent.paintImmediately(JComponent.java:4971)    at javax.swing.RepaintManager$3.run(RepaintManager.java:796)    at javax.swing.RepaintManager$3.run(RepaintManager.java:784)    at java.security.AccessController.doPrivileged(Native Method)    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)    at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:784)    at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:757)    at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:706)    at javax.swing.RepaintManager.access$1000(RepaintManager.java:62)    at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1651)    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727)    at java.awt.EventQueue.access$200(EventQueue.java:103)    at java.awt.EventQueue$3.run(EventQueue.java:688)    at java.awt.EventQueue$3.run(EventQueue.java:686)    at java.security.AccessController.doPrivileged(Native Method)    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)    at java.awt.EventQueue.dispatchEvent(EventQueue.java:697)    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

程序一直运行良好，但我不知道我的代码哪里出了问题，因为我的类都没有出现在堆栈跟踪中。

Answer 1

欢迎来到 Event Dispatch Thread violation(和 race conditions)的奇妙世界。

基本上，您不应该(直接或间接)从 EDT 以外的任何线程更新任何 UI 组件。

基本上，当您更新 TableModel 时，它会触发一个事件，该事件会被试图更新自身的表捕获，但模型状态会不断变化，不会对表的感觉...

相反，尝试使用 SwingWorker 更新您的模型，使用 publish 和 process 方法使更新与 EDT 保持同步

查看 Concurrency in Swing了解更多详情和示例。