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    <p>I would read the text file in a loop on a dedicated work thread, not the event-dispatch thread (EDT). If I know the total number of words to be read, then I can compute the percentage completed at each iteration of the loop and update the progress bar accordingly.</p> <p><strong>Sample Code</strong></p> <p>The following code puts the progress bar in indeterminate mode during preprocessing and postprocessing, displaying an animation that indicates work is occurring. Determinate mode is used when reading iteratively from the input file.</p> <pre><code>// INITIALIZATION ON EDT // JProgressBar progress = new JProgressBar(); // progress.setStringPainted(true); // PREPROCESSING // update progress bar (indeterminate mode) SwingUtilities.invokeLater(new Runnable() { @Override public void run() { progress.setIndeterminate(true); progress.setString("Preprocessing..."); } }); // perform preprocessing (open input file, determine total number of words, etc) // PROCESSING // update progress bar (switch to determinate mode) SwingUtilities.invokeLater(new Runnable() { @Override public void run() { progress.setIndeterminate(false); } }); int count = 0; while (true) { // read a word from the input file; exit loop if EOF // compute soundex representation // add entry to map (hash table) // compute percentage completed count++; final int percent = count * 100 / total; // update progress bar on the EDT SwingUtilities.invokeLater(new Runnable() { @Override public void run() { progress.setString("Processing " + percent + "%"); progress.setValue(percent); } }); } // POSTPROCESSING // update progress bar (switch to indeterminate mode) SwingUtilities.invokeLater(new Runnable() { @Override public void run() { progress.setIndeterminate(true); progress.setString("Postprocessing..."); } }); // perform postprocessing (close input file, etc) // DONE! SwingUtilities.invokeLater(new Runnable() { @Override public void run() { progress.setIndeterminate(false); progress.setString("Done!"); progress.setValue(100); } }); </code></pre> <p><strong>Suggestions</strong></p> <ul> <li>Consider writing a convenience method to update the progress bar on the EDT, so as to reduce clutter in your code (<code>SwingUtilities.invokeLater... public void run()...</code>)</li> </ul>
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    1. POHow to use JProgressBar?
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    1. USZach Scrivena
    1. USZach Scrivena
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    1. COExcellent work Zach! But I wonder if it will make my program way too slower.It seems that I've to process the input file twice -once to determine the no. of words and another time to process each word. Do you have any suggestions for that?Like holding all the words in an array or something like that
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    2. COIt depends where the bottleneck is... I imagine reading the file would be slower than computing the soundex representations and adding them to the map. (cont'd...)
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    3. CO(...cont'd) If so, I wouldn't want to read the file twice. Instead I would use the file length as the "total", and number of characters processed as the "count" (this, of course, is only an approximation because the file length is given in bytes, not characters).
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