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Q: JProgressBar Doesn't Start Until Try-catch finishes I am writing a program which uses Random.ORG api. When I click calculate button, JProgressBar starts right after the opeartion is being done and stay freezed until this moment. I tried extra try-catch clauses, if statements and bool-gates. None of them worked, how could I fix it? kazananiBelirleButon.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { progressBar.setVisible(true); progressBar.setIndeterminate(true); try { HashMap<String, Object> randoms = randSonuc.generateSignedIntegers(5, 0, 10); System.out.println(randoms.toString()); String test = randoms.toString().substring(randoms.toString().indexOf("{r")+1, randoms.toString().indexOf(", da")).replace("random=", "{\"random\":") + "}"; System.out.println(tarihiYazdir(test,14)); cekilisTarihiTextPane.setText(tarihiYazdir(test,2).toString()); sonucPane.setText("\n"+sonuclariYazdir(test,0)); } catch (RandomOrgSendTimeoutException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (RandomOrgKeyNotRunningError e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (RandomOrgInsufficientRequestsError e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (RandomOrgInsufficientBitsError e1) { System.out.print("lol"); e1.printStackTrace(); } catch (RandomOrgBadHTTPResponseException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (RandomOrgRANDOMORGError e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (RandomOrgJSONRPCError e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (MalformedURLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); A: Swing is single threaded. Calling listeners, painting/updating UI all happen on a single thread called the Event Dispatch Thread (EDT). Since you do all your work in the event handler code, the Swing UI cannot be updated until you return from your method (actionPerformed()). Read this tutorial: Concurrency in Swing What you should do is do your time-consuming work in a separate thread and only do short tasks in the EDT (e.g. UI updates). Also check out the SwingWorker class which is designed to perform lengthy GUI-interaction tasks in a background thread. A: Try using swing worker in your method. Swing Worker Here is an example from old version of swing worker. Firs you need to add SwingWorker class to your project: import javax.swing.SwingUtilities; /** * This is the 3rd version of SwingWorker (also known as * SwingWorker 3), an abstract class that you subclass to * perform GUI-related work in a dedicated thread. For * instructions on using this class, see: * * http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html * * Note that the API changed slightly in the 3rd version: * You must now invoke start() on the SwingWorker after * creating it. */ public abstract class SwingWorker { private Object value; // see getValue(), setValue() private Thread thread; /** * Class to maintain reference to current worker thread * under separate synchronization control. */ private static class ThreadVar { private Thread thread; ThreadVar(Thread t) { thread = t; } synchronized Thread get() { return thread; } synchronized void clear() { thread = null; } } private ThreadVar threadVar; /** * Get the value produced by the worker thread, or null if it * hasn't been constructed yet. */ protected synchronized Object getValue() { return value; } /** * Set the value produced by worker thread */ private synchronized void setValue(Object x) { value = x; } /** * Compute the value to be returned by the <code>get</code>