invokelater

问题 I have JPanel which contains JSplitPane. The JPanel is injected during a runtime into a JFrame using the method invokeAndWait. Then the invokeLater is called to update divider location in SplitPane. The problem is, when the divider update is invoked, JPanel width is still 0. When I add sleep or a breakpoint anywhere in the code (except the invokeLater), the code works fine. final JPanel viewPanel = new JPanel(); viewPanel.setLayout(new BorderLayout()); final JPanel header = getPresenterHeader

问题 I am writing a program to collect information from two text files to add to tables in a database. In order to permit the user to select his own files I created a non-static method called chooseFile() that uses JFileChooser class to present a showOpenDialog (I've also tried it as a static method with the same results. If this sounds like I'm guessing, you're correct - I'm only so-so with programming). My understanding is that calls to Swing classes in main() should be done using invokelater .

问题 I am writing a program to collect information from two text files to add to tables in a database. In order to permit the user to select his own files I created a non-static method called chooseFile() that uses JFileChooser class to present a showOpenDialog (I've also tried it as a static method with the same results. If this sounds like I'm guessing, you're correct - I'm only so-so with programming). My understanding is that calls to Swing classes in main() should be done using invokelater .

问题 Ok, this is a follow-up question to my question from yesterday, "Error handling in SwingWorker." In consideration of the fact that it might be ok to call SwingUtilities#invokeAndWait() inside of SwingWorker#doInBackground() , I want to push it a step further and ask: might it also be ok to call SwingUtilities#invokeLater() inside the background thread? Another SSCCE to illustrate: public class NewClass extends javax.swing.JFrame { public NewClass() { jScrollPane1 = new javax.swing.JScrollPane

问题 I like the simplicity of invokeLater() for sending units of work to the AWT EDT. It would be nice to have a similar mechanism for sending work requests to a background thread (such as SwingWorker) but as I understand it, these do not have any sort of event queueing & dispatch mechanism, which is what invokeLater() depends upon. So instead, I've ended up giving my background thread a blocking queue, to which other threads send messages, and the thread essentially runs a receive loop, blocking

问题 I have this code snippet import javax.swing.SwingUtilities; public class Client1 { public static void main( String[] args ) { SwingUtilities.invokeLater( new Runnable() { public void run() { //new MyWindow( "Bayog" ); new MyWindowV2( "Bayog" ); } } ); } } what is the difference if i will not use SwingUtilities? 回答1: Suppose the code within the run method modifies a UI element. If you try to execute that code from a non-UI thread, it will fail: all UI operations must be performed in the UI

问题 Ok I've read an searched all over the web, and I've not found the solution to my problem yet, perhaps I'm missing something simple, hence here I am... I've got a rather large project, that handles work orders for a repair business. It's all database connected, many many pages of code, and classes. But i just added a short bit of code to the front end that essentially checks for new messages in our notes area. Anyway, I display a simple JFrame with two JLabel s while a separate thread queries

问题 I'm having issues updating a JLabel value using invokeLater. I have a separate method outside of the main function that runs invokeLater, but when I click the search button to update the value, it's not updating in the same instance of the gui. I have to relaunch the gui in eclipse to get the value to change. I'm not sure what I'm doing wrong so any help is greatly appreciated. I'm running this method threadStart(); in the actionListener of the button. Here's the method private void

问题 I was just wondering if it is still necessary to ensure synchronicity in an invokeLater() Runnable. I am encountering deadlock and need to overcome it while maintaining concurrency. Would this be an example of good code?: private String text; private void updateText() { SwingUtilities.invokeLater(new Runnable() { public void run() { synchronized(FrameImpl.this) { someLabel.setText(text); } } }); } Sorry for the rather bad example, but we must assume that text is being modified by different

问题 What is the difference between: //Some code, takes a bit of time to process (new SomeJFrame()).setVisible(true); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { (new SomeJWindow()).start();//Start a new thread } }); And: class doGraphics extends SwingWorker<Void, Object> { @Override public Void doInBackground() { //Some code, takes a bit of time to process (new SomeJFrame()).setVisible(true); return null; } @Override protected void done() { (new SomeJWindow()).start(