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POJTextArea's append () method doesn't seem to work
 

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    <p>We were assigned to create a simple compiler as a homework that will take set of instructions (containing variables, conditions, jumps, etc.) and evaluate them. That's already done, but I thought I'd make my program little bit more… “shiny”, and add the ability to load instructions from a text file, just for the sake of user comfort; however, it seems that the <code>JTextArea</code>'s <code>append ()</code> method doesn't seem to really like me, as it does exactly nothing. Here's the relevant code:</p> <pre><code>BufferedReader bufferedReader; File file; FileDialog fileDialog = new FileDialog (new Frame (), "Open File", FileDialog.LOAD); String line; fileDialog.setVisible (true); if (fileDialog.getFile () != null) { file = new File (fileDialog.getDirectory () + fileDialog.getFile ()); input.setText (""); // delete old first try { bufferedReader = new BufferedReader (new FileReader (file)); line = bufferedReader.readLine (); while (line != null) { input.append (line); System.out.println (line); line = bufferedReader.readLine (); } } catch (IOException ioe) { ioe.printStackTrace (); } } </code></pre> <p>(I'm using Awt's FileDialog instead of Swing's JFileChooser because it simply looks better on Mac, as seen in <a href="https://developer.apple.com/library/mac/#documentation/Java/Conceptual/Java14Development/07-NativePlatformIntegration/NativePlatformIntegration.html" rel="nofollow">Apple's official recommendation</a>.)</p> <p>The <code>input</code> variable used in this code points to the JTextArea instance. The funny thing is – the file reading part must be working flawlessly, as I can see the file content being written to the standard output thanks to the <code>System.out.println ()</code> call within the <code>while</code> loop. However, nothing appears in the <code>JTextArea</code>, and I've tried all the existing solutions I've found here on StackOverflow – that includes calling the <code>repaint ()</code>, <code>revalidate ()</code> and <code>updateUI ()</code> methods.</p> <p>What am I missing? Thanks very much for any answer!</p>
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    1. COSide-step the problems using [JTextComponent.read(Reader,Object)](http://docs.oracle.com/javase/7/docs/api/javax/swing/text/JTextComponent.html#read%28java.io.Reader,%20java.lang.Object%29).
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    2. CO*"I'm using Awt's FileDialog instead of Swing's JFileChooser because it simply looks better on Mac,.."* What are you doing for Windows and *nix? If targeting only the Mac., why use Java rather than ..Cocoa or whatever is the name of the OS X native GUI toolkit?
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    3. CO*"We were assigned .. a homework .. That's already done, but I thought I'd make my program little bit more… “shiny”"* I meant to mention this before but got distracted by the technical side of the question. If it is homework, time is often better spent improving the readability of the source, adding (relevant) comments, or writing tests that prove the code. Better to submit well written code with no visible bugs, than code with a red stripe and gold stars that breaks, is inefficient & poorly written. :)
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