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copied!<p>You can't change a <code>final</code> variable. That's what makes it <code>final</code>. But there is nothing wrong with passing the <code>final</code> variable to a function. In fact, the sample code that you posted runs just fine.</p> <p>In your list of steps, you said 'change DATA to "B"' though your code doesn't show this step. But that's fine, since that step wouldn't compile.</p> <p>If you need to alter a <code>final</code> variable before passing it to a function, you need to make a local copy and change that copy instead.</p> <p><strong>Update:</strong> Now that the question has been clarified, here are some more thoughts:</p> <p>It sounds like something isn't being recompiled properly. Perhaps you are running from an old version of the classes (i.e. you need to copy it somewhere)?</p> <p>Also, you should know that although you may change the <code>TestData</code> class, because <code>DATA</code> is declared <code>static final</code>, Java may have inlined that constant into the <code>MyTest</code> class (since it is guaranteed to never change) so you need to make sure that <code>MyTest</code> is also recompiled.</p> <p>If you want to verify that you are using the latest version of a class, put some very "loud" code in a place where you know it should execute. For example, a <code>System.out.println</code> or even throw a <code>RuntimeException</code> (sure, your program will fail, but if it doesn't fail then you <em>know</em> that something isn't being recompiled properly which will help you diagnose what is wrong).</p>

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