I can't update my progressbar... this is my code
Thread t=new Thread(new Runnable(){ public void run(){ int i=1; jProgBar.setMinimum(0); jProgBar.setMaximum(100); try { while(i<=100 || true){ jProgBar.setValue(i); i++; Thread.sleep(50); } } catch (InterruptedException ex){ jProgBar.setValue(jProgBar.getMaximum()); } } }); t.start(); .... Something code that correctly works t.interrupt(); The progress bar state is updated only at the end of thread. Can someone help me??
Before the sleep, add a call to SwingUtilties.invokeLater() that spawns a thread to fire a firePropertyChange on the progressbar in the EDT.
Use a model instead of the JProgressBar directly:
DefaultBoundedRangeModel model = new DefaultBoundedRangeModel(); JProgressBar bar = new JProgressBar(model); // Somewhere else, perhaps in another Thread model.setValue(i) The following example works fine:
public static void main(String[] args) throws InterruptedException { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 100); frame.setVisible(true); final DefaultBoundedRangeModel model = new DefaultBoundedRangeModel(); frame.add(new JProgressBar(model)); Thread t = new Thread(new Runnable() { public void run() { int i = 1; model.setMinimum(0); model.setMaximum(100); try { while (i <= 100 || true) { model.setValue(i); i++; Thread.sleep(50); } } catch (InterruptedException ex) { model.setValue(model.getMaximum()); } } }); t.start(); Thread.sleep(2000); t.interrupt(); } 
The best advice for your situation is to use SwingWorker. Check out the API at http://java.sun.com/javase/6/docs/api/javax/swing/SwingWorker.html
Override process method to update value of progress bar ( then it will be done correctly on EDT)
More info can be obtained at http://java.sun.com/products/jfc/tsc/articles/threads/threads2.html
Per eugener, SwingWorker is definitely what you want to be using here, or any time a long-running task is spawned that could otherwise lock up your GUI prior to completion. A full tutorial on using progress bars with SwingWorker is available from Sun^H^H^HOracle here:
http://java.sun.com/docs/books/tutorial/uiswing/components/progress.html
Thanks All. I solved in this way
try{ jProgBar.setIndeterminate(true); jProgBar.setStringPainted(true); jProgBar.setBorderPainted(true); new Thread(new Runnable() { public void run() { ... // here is code that i've to wait // after this i stop my jProgressBar ... jProgBar.setStringPainted(false); jProgBar.setBorderPainted(true); jProgBar.setIndeterminate(false); } }).start(); } catch(IllegalStateException ex){ //some code } Putting this snippet
SwingUtilities.invokeLater(new Runnable() { public void run() { jProgBar.repaint(); } } Between 'i++' and 'Thread.sleep()' should do the job. To get it compiling, mark jProgBar as 'final'.
