How to insert string

it doesn't work. someone, pls do some correction to my code.
i want: when i click the button, the STRING in TextField is inserted to TextArea.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class MyFrame extends JFrame
{     public MyFrame()
     {     setTitle("I Like Java");
          setSize(500, 300);
          addWindowListener(new WindowAdapter()
          {     public void windowClosing(WindowEvent e)
               {     System.exit(0); }
     Container contentPane = getContentPane();
     JPanel panel = new JPanel();
     JButton saveButton = new JButton("Save");
     panel.add(saveButton);
     saveButton.addActionListener(new ActionListener()
                        // might have problem here
          {     public void actionPerformed(ActionEvent evt)
               {     ta.insert(tf.getText(),0);
     JTextField tf = new JTextField(8);
     panel.add(tf);
     JTextArea ta = new JTextArea(8,40);
     JScrollPane scrollPane = new JScrollPane(ta);
     contentPane.add(panel, "South");
     contentPane.add(scrollPane, "Center");
public class ILikeJava
{     public static void main(String[] args)
     {     JFrame frame = new MyFrame();
          frame.show();
}

still got errors... plss
i have doing this for 4 days...
java.lang.NullPointerException
        at MyFrame$2.actionPerformed(ILikeJava.java:22)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
        at java.awt.Component.processMouseEvent(Component.java:5100)
        at java.awt.Component.processEvent(Component.java:4897)
        at java.awt.Container.processEvent(Container.java:1569)
        at java.awt.Component.dispatchEventImpl(Component.java:3615)
        at java.awt.Container.dispatchEventImpl(Container.java:1627)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
        at java.awt.Container.dispatchEventImpl(Container.java:1613)
        at java.awt.Window.dispatchEventImpl(Window.java:1606)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

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SQL> commit;
Commit complete.
SQL> select * from test;
NAME
Santosh's Demo.
SQL>Regards,
S.K.

How to insert string

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