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copied!<p><a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html" rel="noreferrer"><code>SwingWorker</code></a> is ideal for this. The example below performs a simple iteration in the background, while reporting progress and intermediate results in a window. You can pass whatever parameters you need in a suitable <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html" rel="noreferrer"><code>SwingWorker</code></a> constructor.</p> <pre><code>import java.awt.EventQueue; import java.awt.GridLayout; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.text.DecimalFormat; import java.util.List; import javax.swing.*; /** @see http://stackoverflow.com/questions/4637215 */ public class TwoRoot extends JFrame { private static final String s = "0.000000000000000"; private JProgressBar progressBar = new JProgressBar(0, 100); private JLabel label = new JLabel(s, JLabel.CENTER); public TwoRoot() { this.setLayout(new GridLayout(0, 1)); this.setTitle("√2"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.add(progressBar); this.add(label); this.setSize(161, 100); this.setLocationRelativeTo(null); this.setVisible(true); } public void runCalc() { progressBar.setIndeterminate(true); TwoWorker task = new TwoWorker(); task.addPropertyChangeListener(new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent e) { if ("progress".equals(e.getPropertyName())) { progressBar.setIndeterminate(false); progressBar.setValue((Integer) e.getNewValue()); } } }); task.execute(); } private class TwoWorker extends SwingWorker<Double, Double> { private static final int N = 5; private final DecimalFormat df = new DecimalFormat(s); double x = 1; @Override protected Double doInBackground() throws Exception { for (int i = 1; i <= N; i++) { x = x - (((x * x - 2) / (2 * x))); setProgress(i * (100 / N)); publish(Double.valueOf(x)); Thread.sleep(1000); // simulate latency } return Double.valueOf(x); } @Override protected void process(List<Double> chunks) { for (double d : chunks) { label.setText(df.format(d)); } } } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { TwoRoot t = new TwoRoot(); t.runCalc(); } }); } } </code></pre>

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