Notepad written in Java

Studied Java for one months. wrote a notepad. Due to the time relationship. To practice, many functions are not added, only to achieve a simple interface and the most basic functions.
Later have time to perfect it.

=================================================================================

* * cats and kittens. 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 ("Please type content");
Interface


Exit events
This.addwindowlistener (New Windowadapter ()
{
public void windowclosing (WindowEvent e)
{
System.exit (0);
}
});
A simple layout
Final JPanel panel=new JPanel ();
Panel.setlayout (New GridLayout (1,1));
Panel.add (new JScrollPane (text));
This.getcontentpane (). Add (panel);

Menu items
JMenuBar Mbar = new JMenuBar ();
This.setjmenubar (Mbar);
JMenu file = new JMenu ("file");
JMenu edit = New JMenu ("edit");
JMenu helps = new JMenu ("help");
Mbar.add (file);
Mbar.add (edit);
Mbar.add (Help);
JMenuItem newFile = new JMenuItem ("new");


Newfile.addactionlistener (New ActionListener ()
{
public void actionperformed (ActionEvent e)
{
Text.settext ("");
}
});

Layout end
New file
Newfile.setmnemonic (' N ');
Newfile.setaccelerator (Keystroke.getkeystroke (' N ', java.awt.event.ctrl_mask,true));
Open File
JMenuItem open = new JMenuItem ("open");
Open.setmnemonic (' O ');
Open.setaccelerator (Keystroke.getkeystroke (' O ', java.awt.event.ctrl_mask,true));
Open.addactionlistener (new ActionListener () {
public void actionperformed (ActionEvent e) {
JFileChooser OpenFile = new JFileChooser ();
Openfile.setdialogtitle ("Open file");
Openfile.setapprovebuttontext ("open");
Openfile.showopendialog (panel);
File filename = Openfile.getselectedfile ();
StringBuffer STRBF = new StringBuffer ();
String error_message = "error";
FileInputStream inputfile = null;
try{
Char buffer[] = new char[1024];
Inputfile = new FileInputStream (filename);
int len = 0;
FileReader in = new FileReader (Filename.getabsolutefile ());
while (len = in.read (buffer))!=-1)
{
Strbf.append (buffer, 0, Len);
}
Inputfile.close ();
Text.settext (Strbf.tostring ());
String openfilename = Filename.getname ();
Settitle (OPENFILENAME);

}
catch (IOException Ioex)
{
Joptionpane.showmessagedialog (Panel,error_message,title,type);
}

}});
Save File

JMenuItem save = new JMenuItem ("Save");
Save.setmnemonic (' S ');
Save.setaccelerator (Keystroke.getkeystroke (' S ', java.awt.event.ctrl_mask,true));
Save.addactionlistener (New ActionListener ()
{
public void actionperformed (ActionEvent e)
{
JFileChooser savefile=new JFileChooser ();
Savefile.setapprovebuttontext ("Save");
Savefile.setdialogtitle ("Save File");
Savefile.showsavedialog (panel);
File Filesa=savefile.getselectedfile ();
String file_notfound_message= "File not found";
FileOutputStream Outputfile=null;
Start Handling Exceptions
Try
{
outputfile = new FileOutputStream (FILESA);
}
catch (FileNotFoundException Fe)
{
Joptionpane.showmessagedialog (Panel,file_notfound_message,title,type);
}

String Filecontent=text.gettext ();
String write_error_message= "Write file Error";
Try
{
Outputfile.write (Filecontent.getbytes ());
}
catch (IOException Ioex)
{
Joptionpane.showmessagedialog (Panel,write_error_message,title,type);
}
String cmessage= "Shutdown error";

Try
{
Outputfile.close ();
}
catch (IOException Ioex)
{
Joptionpane.showmessagedialog (Panel,cmessage,title,type);
}
}
}
);
Exit

JMenuItem exit = new JMenuItem ("Exit");
Exit.addactionlistener (New ActionListener ()
{
public void actionperformed (ActionEvent e)
{
System.exit (0);
}
});
Exit.setmnemonic (' Q ');
Exit.setaccelerator (Keystroke.getkeystroke (' Q ', java.awt.event.ctrl_mask,true));
Find
JMenuItem find = new JMenuItem ("lookup");
Find.addactionlistener (New ActionListener ()
{
public void actionperformed (ActionEvent e)
{
Because the curriculum is too tight. So the search function doesn't have time to add up. ^_^
}
});
Find.setmnemonic (' F ');
Find.setaccelerator (Keystroke.getkeystroke (' F ', java.awt.event.ctrl_mask,true));
Shear
JMenuItem cut = new JMenuItem ("shear");
Cut.addactionlistener (New ActionListener ()
{
public void actionperformed (ActionEvent e)
{
Text.cut ();
}
});
Cut.setmnemonic (' C ');
Cut.setaccelerator (Keystroke.getkeystroke (' C ', java.awt.event.ctrl_mask,true));
Copy
JMenuItem copy = new JMenuItem ("copy");
Copy.addactionlistener (New ActionListener ()
{
public void actionperformed (ActionEvent e)
{
Text.copy ();
}
});
Copy.setmnemonic (' O ');
Copy.setaccelerator (Keystroke.getkeystroke (' O ', java.awt.event.ctrl_mask,true));
Paste
JMenuItem paste = new JMenuItem ("paste");
Paste.addactionlistener (new ActionListener () {
public void actionperformed (ActionEvent e) {
Text.paste ();
}});
Paste.setmnemonic (' P ');
Paste.setaccelerator (Keystroke.getkeystroke (' P ', java.awt.event.ctrl_mask,true));

JMenuItem about = new JMenuItem ("about");
About.addactionlistener (new ActionListener () {
public void actionperformed (ActionEvent e) {
int type=joptionpane.information_message;
String title= "about";
String message= "Make by Cat Lee";
Joptionpane.showmessagedialog (Panel,message,title,type);
}});
File.add (NewFile);
File.add (open);
File.add (save);
File.addseparator ();
File.add (exit);
Edit.add (cut);
Edit.add (copy);
Edit.add (paste);
Edit.add (find);
Help.add (about);

}
public static void Main (string[] args) {
Notepad Notepad = new Notepad ();
Notepad.setsize (640, 480);
Notepad.setvisible (TRUE);
Notepad.setdefaultcloseoperation (Jframe.exit_on_close);
}

}