问如何使用JProgressBar？

EN

// 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);
    }
});