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copied!<p>Swing is a single threaded framework, that is, all interactions and modifications to the UI are expected to occur within the context of the Event Dispatching Thread.</p> <p>The EDT is responsible for, amongst other things, processing repaint requests.</p> <p>Anything that stops the EDT from running (like <code>Thread.sleep</code> and looping for a long time) will prevent it from processing the events, virtually "hanging" your application until it becomes unblocked...</p> <p>Now, I tried to decipher what you program was trying to do...but failed, so instead...I made a pretty counter...</p> <p><img src="https://i.stack.imgur.com/G1SPR.gif" alt="enter image description here"></p> <pre><code>import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Random; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.Timer; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class TickOver { public static void main(String[] args) { new TickOver(); } public TickOver() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private JTextField field; private JButton button; private int tick; private Timer timer; public TestPane() { field = new JTextField(10); field.setEditable(false); button = new JButton("Start"); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { button.setEnabled(false); tick = 0; timer.start(); } }); timer = new Timer(1000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { field.setText(Integer.toString(++tick)); if (tick > 4) { timer.stop(); button.setEnabled(true); } } }); timer.setInitialDelay(0); setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.gridwidth = GridBagConstraints.REMAINDER; add(field, gbc); add(button, gbc); } } } </code></pre> <p>Take a close look at <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/" rel="nofollow noreferrer">Concurrency in Swing</a> for more details...</p>

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