我的程序使用Swing的JPanel,JList中,JScrollPane的...Java Swing BasicUI更新錯誤,我能做些什麼?
它運行良好,但產生以下錯誤消息,並且還沒有在郵件中也沒有說我的方案的行導致錯誤,有什麼可以我做 ?
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Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 3
at javax.swing.plaf.basic.BasicListUI.updateLayoutState(BasicListUI.java:1356)
at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(BasicListUI.java:1299)
at javax.swing.plaf.basic.BasicListUI.getPreferredSize(BasicListUI.java:566)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1632)
at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:769)
at java.awt.Container.layout(Container.java:1398)
at java.awt.Container.doLayout(Container.java:1387)
at java.awt.Container.validateTree(Container.java:1485)
at java.awt.Container.validate(Container.java:1457)
at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:670)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:127)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
================ ================================================== ===================
我在程序中有各種.validate()和.repaint()語句,以確保它能夠正確運行。因爲我的程序看起來很好,這是否意味着我可以忽略錯誤?我可以做什麼來避免錯誤信息?
============================================== ======================================= 這裏有更多的細節:
< 1> Java版本jdk1.6.0_11
< 2>如何初始化列表:
for (int Selector_Id=0;Selector_Id<6;Selector_Id++)
{
Stock_Symbol_Data[Selector_Id]=new DefaultListModel();
Stock_Symbol_List[Selector_Id]=new JList(Stock_Symbol_Data[Selector_Id]);
Stock_Symbol_ScrollPane[Selector_Id]=new JScrollPane(Stock_Symbol_List[Selector_Id]);
}
...
Stock_Symbol_Data[A_Selector_Id].clear();
if (Selected_Symbols_Vector.size()>0)
for (int i=0;i<Selected_Symbols_Vector.size();i++)
Stock_Symbol_Data[A_Selector_Id].addElement(Selected_Symbols_Vector.elementAt(i));
伊沙伊是正確的,因爲我的程序需要初始化一個很長的名單,這需要一分鐘左右。我等不及要在init完成之前看到UI,所以我把它放在「SwingWorker」類中,讓它在應用程序UI窗口打開後執行init;這樣我就可以在UI中看到進度,而不用等待第一個窗口打開。在我看來,這是個人電腦緩慢的問題,搞亂了UI更新過程;如果我稍後轉向更快的機器,Swing應該將此解決,否則我是否正確?
我試圖使用「(包裹在一個Runnable的變化和調用SwingUtilities.invokeLater)」的方法,但它沒有按預期工作。它等待所有的列表填入,然後打開第一個窗口;這意味着我必須在第一個UI出現之前查看空屏幕一分鐘。
隨着SwingWorker,它現在隨機顯示錯誤消息 - 有時在這裏,有時在那裏,其他時間根本沒有。
我的SwingWorker是這樣的:
class Update_Selection_Worker extends SwingWorker<Integer,Integer> // Look into SwingWorkerDemo in Fit for details
{
int Selector_Id;
boolean Update_Only_This_Selector;
Stock_Image_Scanner Stock_image_scanner;
public Update_Selection_Worker(int Selector_Id,boolean Update_Only_This_Selector,Stock_Image_Scanner Stock_image_scanner)
{
this.Selector_Id=Selector_Id;
this.Update_Only_This_Selector=Update_Only_This_Selector;
this.Stock_image_scanner=Stock_image_scanner;
}
@Override
protected Integer doInBackground() throws Exception
{
// Out(" In Update_Selection_Worker Selector_Id="+Selector_Id);
if (Update_Only_This_Selector) // Only need to update from Rules_Panel_Id, eariler ones haven't changed
{
Stock_image_scanner.Update_Selector_List(Selector_Id);
Thread.sleep(5);
publish(Selector_Id);
}
else for (int i=Selector_Id;i<Stock_image_scanner.Rules_Panel_Count;i++)
{
Stock_image_scanner.Update_Selector_List(i);
Thread.sleep(5);
publish(i);
}
return 1;
}
@Override
protected void process(java.util.List<Integer> chunks) // As the worker thread executes, it can publish results of V type. Override the process method to work with intermediate results.
{
for (final int i : chunks)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
Stock_image_scanner.Selector_Total_Label[i].setText(Stock_image_scanner.Stock_Symbol_Data[i].getSize()+"");
Stock_image_scanner.Stock_Symbol_List[i].revalidate();
Stock_image_scanner.Stock_Symbol_List[i].repaint();
Stock_image_scanner.Stock_Symbol_ScrollPane[i].revalidate();
Stock_image_scanner.Stock_Symbol_ScrollPane[i].repaint();
Stock_image_scanner.Selector_Panel[i].revalidate();
Stock_image_scanner.Selector_Panel[i].repaint();
}
});
}
}
@Override
protected void done()
{
}
public static void out(String message) { System.out.print(message); }
public static void Out(String message) { System.out.println(message); }
}
你可以發佈創建/初始化你的JList的代碼嗎? – 2009-06-25 19:36:35
千萬不要忽略Java引發的錯誤(或任何編程語言)。你可能沒有注意到任何錯誤,但通常這樣的錯誤是令人擔憂的,並且可能會影響到你。現在只要在腦海中保持新鮮感,並且在這之前沒有寫很多代碼就更好了。 – AlbertoPL 2009-06-25 19:41:39
您正在使用哪個版本的java? – akf 2009-06-25 19:49:15