Using javax.swing.JDialog

public class MyDiaglog extends JDialog { private JButton jButton1 = new JButton(); private JTextField jTextField1 = new JTextField(); public MyDiaglog() { this(null, "", false); setVisible(true); } public MyDiaglog(Frame parent, String title, boolean modal) { super(parent, title, modal); try { jbInit(); } catch (Exception e) { e.printStackTrace(); } } private void jbInit() throws Exception { this.setSize( new Dimension( 400, 300 ) ); this.getContentPane().setLayout( null ); jButton1.setText("jButton1"); jButton1.setBounds(new Rectangle(270, 50, 73, 22)); jTextField1.setBounds(new Rectangle(130, 85, 110, 20)); this.getContentPane().add(jTextField1, null); this.getContentPane().add(jButton1, null); jButton1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { jButton1_actionPerformed(e); } }); } private void jButton1_actionPerformed(ActionEvent e) { jTextField1.setText("hello"); } }