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copied!<p>There are some hints below to guide you to solve the problem:</p> <ul> <li><p>Check the while loop, it seems to be blocking the <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html" rel="nofollow noreferrer">Event Dispatching Thread</a> (a.k.a. EDT) and that's freezing your GUI. Also take a look to <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html" rel="nofollow noreferrer">Concurrency in Swing</a> trail for further details on how the EDT works and how to deal with it.</p></li> <li><p>You should avoid the use of multiple <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/JFrame.html" rel="nofollow noreferrer">JFrame</a> and consider use modal <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/JDialog.html" rel="nofollow noreferrer">JDialog</a> instead: <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/modality.html" rel="nofollow noreferrer">How to Use Modality in Dialogs</a>. Also take a look to this topic: <a href="https://stackoverflow.com/questions/9554636/the-use-of-multiple-jframes-good-bad-practice">The Use of Multiple JFrames, Good/Bad Practice?</a></p></li> <li><p>You may want to try <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html" rel="nofollow noreferrer">Properties</a> to store user passwords and get rid of handling file's IO by using <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html" rel="nofollow noreferrer">Scanner</a> class. <strong>Note:</strong> ideally it should be done in a database but in this case you're doing this in a ".txt" file so I think properties would be more appropriate. Take a look to <a href="http://docs.oracle.com/javase/tutorial/essential/environment/properties.html" rel="nofollow noreferrer">this trail</a> and <a href="https://stackoverflow.com/questions/1318347/how-to-use-java-property-files">How to use Java property files?</a> to start with properties.</p></li> </ul> <p><strong>Off-topic:</strong></p> <ul> <li>Always try to follow <a href="http://www.oracle.com/technetwork/java/codeconventions-150003.pdf" rel="nofollow noreferrer">Java Code Conventions</a>.</li> </ul>

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