NotePad written in JAVA

After learning JAVA for a month, I wrote a NotePad. Due to the time relationship, I had to perform practical training. Many functions were not added, but only simple interfaces and basic functions were implemented.
I will try again later ..
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/* Cat... the first Java program
*
*
* Copyright cat
*/
Import java. awt .*;
Import java. awt. event .*;
Import javax. swing .*;
Import javax. swing. event .*;
Import java. io .*;
Public class Notepad extends JFrame
{
String openFilePath;
String openFileName;
String title = "error message ";
Int type = JOptionPane. ERROR_MESSAGE;
Public Notepad ()
  {
Super ("notepad ");
Final JTextArea text = new JTextArea ();
Text. setToolTipText ("Enter the content ");
// Interface
// Exit event
This. addWindowListener (new WindowAdapter ()
    {
Public void windowClosing (WindowEvent e)
        {
System. exit (0 );
        }
});
// Simple layout
Final JPanel panel = new JPanel ();
Panel. setLayout (new GridLayout (1, 1 ));
Panel. add (new JScrollPane (text ));
This. getContentPane (). add (panel );
// Menu item
JMenuBar Mbar = new JMenuBar ();
This. setJMenuBar (Mbar );
JMenu file = new JMenu ("file ");
JMenu edit = new JMenu ("edit ");
JMenu help = new JMenu ("help ");
Mbar. add (file );
Mbar. add (edit );