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    <h2>Problem #1</h2> <p>The components you are trying to update are not, in any way, connected to the screen...</p> <pre><code>public JTextArea estado = new JTextArea(); public JTextField updatedVersion = new JTextField(); public JLabel updatedLabel = new JLabel(); </code></pre> <p>That means, anytime you interact with these components, it's doing nothing to what's on the screen...</p> <h2>Problem #2</h2> <p>You're trying to make modifications to the UI from outside the context of the Event Dispatching Thread. This is significant violation of the Swing threading rules.</p> <pre><code>public class Check extends SwingWorker&lt;String, String&gt; { private JTextArea estado; Private JTextField updatedVersion; private JLabel updatedLabel; private String catchUpdatedVersion; int UPDATENUMBER; int CURRENTNUMBER; public Check(JTextArea estado, JTextField updatedVersion, JLabel updatedLabel) { this.estado = estado; this.updatedVersion = updatedVersion; this.updatedLabel = updatedLabel; } protected void process(List&lt;String&gt; values) { for (String value : values) { estado.append(value); } } protected String doInBackground() throws Exception { String infURL = "https://thread.googlecode.com/svn/trunk/thread.inf"; String name = "thread.inf"; File file = new File(name); URLConnection conn = new URL(infURL).openConnection(); conn.connect(); publish("Conectando al servidor..."); publish(System.getProperty("line.separator")); publish(" -- Buscando actualizaciones... --"); publish(System.getProperty("line.separator")); /*...*/ } } </code></pre> <p>IfYou need to do any post-processing, then you also override <code>done</code> which will be called after <code>doInBackground</code> has existed, but is called within the context of the EDT</p> <p>For more details read through <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/" rel="nofollow">Concurrency in Swing</a></p>
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    1. COYes, I solved problem 1 and 2 by implementing a swingworker method, now everything works fine. My program is supposed to download a file and represent its percentage in a progressbar. It actually downloads the file, but the progressbar doesn't move until the download is completed, then suddenly it marks 100%. I can't see the "animation" between 0 and 100
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    2. CO`SwingWorker` has the capacity to provide progress feedback itself, for [example](http://stackoverflow.com/questions/16937997/java-swingworker-thread-to-update-main-gui/16938228#16938228), [example](http://stackoverflow.com/questions/15199091/progress-bar-java/15199220#15199220), [example](http://stackoverflow.com/questions/12020949/jprogressbar-isnt-progressing/12021971#12021971),
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