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copied!<p>To make <code>Swing</code> GUI to update dynamically on fire of some event or with some continuous background changes , you can use <code>SwingWorker</code> API provided by <code>Swing</code>. Try this Code :</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; public class DynamicWrite implements ActionListener { JFrame frame = new JFrame("TextArea"); JTextArea tArea = new JTextArea(10,20); JButton button = new JButton("Click"); JScrollPane pane = new JScrollPane(tArea); SwingWorker worker; String s= "Java is an Object Oriented Programming langauge...Java is static typed language...asbfldfjsdj";//some random String public void prepareAndShowGUI() { Container container = frame.getContentPane(); container.add(pane);container.add(button,BorderLayout.NORTH); tArea.setLineWrap(true); tArea.setWrapStyleWord(true) ; button.addActionListener(this); frame.pack(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } public void actionPerformed(ActionEvent evt) { if(evt.getSource()==button) { tArea.setText(""); if (worker!=null) { worker.cancel(true); } worker = new SwingWorker() { @Override protected Integer doInBackground()//Perform the required GUI update here. { try { for(int i = 0;i<s.length();i++) { tArea.append(String.valueOf(s.charAt(i))); Thread.sleep(5); } }catch(Exception ex){} return 0; } }; worker.execute();//Schedules this SwingWorker for execution on a worker thread. } } public static void main(String st[]) { DynamicWrite dyna = new DynamicWrite(); dyna.prepareAndShowGUI(); } } </code></pre> <p>I hope this solves your problem.<br>To know more about SwingWorker API watch <a href="http://docs.oracle.com/javase/6/docs/api/javax/swing/SwingWorker.html" rel="nofollow">here</a> </p>

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