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primarykey
Id
2979105
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0
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0
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1
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2010-06-05T04:03:22.183
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2010-06-05T05:07:13.010
LastEditDate
2017-05-23T11:47:36.707
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text
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The reason why they arent showing is because you are probably calling the static <code>showCourseListDialog()</code> to show your dialog. This method will test whether your static <code>courseListDialog</code> is null, and if so, create one and set that dialog visible, not the <code>clf</code> that you instantiated. If in your <code>showCourseListDialog()</code> you call the <code>addCourses()</code> method after instantiating your 'singleton', you should be OK: <pre><code>public static void showCourseListDialog() { if (courseListDialog == null) { courseListDialog = new CourseListFrame(); courseListDialog.addCourses();// <<---- this is key! } courseListDialog.pack(); courseListDialog.setVisible(true); courseListDialog.setSize(260, 180); } </code></pre> That said, by having the <code>static</code> <code>courseListDialog</code>, it is apparent that you want that dialog to be a singleton. If that is the case, I would at least make your constructor <code>private</code>. You want to proactively avoid the situation that you are getting into where you can construct multiple instances of a singleton. You still would have a race condition to deal with in your <code>showCourseListDialog</code>, but as you will only be calling this method in the EDT, you should be safe. Take a look at <a href="https://stackoverflow.com/questions/70689/efficient-way-to-implement-singleton-pattern-in-java">this</a> and other topics on Singleton development in Java (and dont forget to read the <a href="https://stackoverflow.com/search?q=singleton+antipattern">con arguments</a> where it is described as an anti-pattern) 
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1. COthanks akf for your suggestion. yes it was race condition in two different classes. i got it to work :-) THanks for Singleton link too.
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 USPujan Srivastava

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