Simple Notepad Java source instance _java

This example describes the simple Notepad Java implementation code. Share to everyone for your reference. Specifically as follows:

The complete code is as follows:

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Import java.awt.*;
Import java.io.*;
Import java.awt.datatransfer.*;
Import java.awt.event.*;

public class Main extends Frame implements ActionListener {
Private static final long serialversionuid = 1L;
TextArea TextArea = new TextArea ();
MenuBar MenuBar = new MenuBar ();
Menu Filemenu = new Menu ("File");
MenuItem newitem = new MenuItem ("new");
MenuItem Openitem = new MenuItem ("Open");
MenuItem SaveItem = new MenuItem ("Save");
MenuItem Saveasitem = new MenuItem ("Save as");
MenuItem Exititem = new MenuItem ("Exit");
Menu Editmenu = new Menu ("Edit");
MenuItem SelectItem = new MenuItem ("Select All");
MenuItem CopyItem = new MenuItem ("Copy");
MenuItem Cutitem = new MenuItem ("cut");
MenuItem Pasteitem = new MenuItem ("Paste");
String fileName = null;
Toolkit Toolkit=toolkit.getdefaulttoolkit ();
Clipboard Clipboard=toolkit.getsystemclipboard ();

Private FileDialog OpenFileDialog = new FileDialog (this, "Open File", filedialog.load);
Private FileDialog Saveasfiledialog = new FileDialog (this, "Save File as", Filedialog.save);

Public Main () {
Settitle ("notepad program-by jackbase");
SetFont (New Font ("Times New Roman", font.plain,12));
SetBackground (Color.White);
SetSize (400,300);
Filemenu.add (NewItem);
Filemenu.add (Openitem);
Filemenu.addseparator ();
Filemenu.add (SaveItem);
Filemenu.add (Saveasitem);
Filemenu.addseparator ();
Filemenu.add (Exititem);
Editmenu.add (SelectItem);
Editmenu.addseparator ();
Editmenu.add (CopyItem);
Editmenu.add (Cutitem);
Editmenu.add (Pasteitem);
Menubar.add (Filemenu);
Menubar.add (Editmenu);
Setmenubar (MenuBar);
Add (TextArea);
Addwindowlistener (New Windowadapter () {
public void windowclosing (WindowEvent e) {
System.exit (0);
}
});
Newitem.addactionlistener (this);
Openitem.addactionlistener (this);
Saveitem.addactionlistener (this);
Saveasitem.addactionlistener (this);
Exititem.addactionlistener (this);
Selectitem.addactionlistener (this);
Copyitem.addactionlistener (this);
Cutitem.addactionlistener (this);
Pasteitem.addactionlistener (this);
}

public void actionperformed (ActionEvent e) {//Listener event
Object EventSource = E.getsource ();
if (EventSource = = NewItem) {
Textarea.settext ("");
}else if (EventSource = = Openitem) {
Openfiledialog.show ();
FileName = Openfiledialog.getdirectory () +openfiledialog.getfile ();
if (fileName!= null)
ReadFile (FileName);
}else if (EventSource = = SaveItem) {
if (fileName!= null)
WriteFile (FileName);
}else if (EventSource = = Saveasitem) {
Saveasfiledialog.show ();
FileName = Saveasfiledialog.getdirectory () +saveasfiledialog.getfile ();
if (filename!= null)
WriteFile (FileName);
}else if (EventSource = = SelectItem) {
Textarea.selectall ();
}else if (EventSource = = CopyItem) {
String Text=textarea.getselectedtext ();
StringSelection selection=new stringselection (text);
Clipboard.setcontents (Selection,null);
}else if (EventSource = = Cutitem) {
String Text=textarea.getselectedtext ();
StringSelection selection=new stringselection (text);
Clipboard.setcontents (Selection,null);
Textarea.replacerange ("", Textarea.getselectionstart (), Textarea.getselectionend ());
}else if (EventSource = = Pasteitem) {
Transferable contents=clipboard.getcontents (this);
if (contents==null) return;
String text;
Text= "";
try{
text= (String) contents.gettransferdata (Dataflavor.stringflavor);
}catch (Exception Exception) {
}
Textarea.replacerange (Text,textarea.getselectionstart (), Textarea.getselectionend ());
}else if (EventSource = = Exititem) {
System.exit (0);
}
}

public void ReadFile (String fileName) {//Read file processing
try{
File File = new file (fileName);
FileReader Readin = new FileReader (file);
int size = (int) file.length ();
int charsread = 0;
char[] content = new Char[size];
while (Readin.ready ())
Charsread + + readin.read (content, Charsread, size-charsread);
Readin.close ();
Textarea.settext (New String (content, 0, charsread));
}
catch (IOException e) {
System.out.println ("Error opening file");
}
}

public void WriteFile (String fileName) {//write file processing
try{
File File = new file (fileName);
FileWriter writeout = new FileWriter (file);
Writeout.write (Textarea.gettext ());
Writeout.close ();
}
catch (IOException e) {
System.out.println ("Error writing file");
}
}

@SuppressWarnings ("deprecation")
public static void Main (string[] args) {
Frame frame = new Main (); Creating objects
Frame.show (); is the object display
}
}

The results of the operation are shown in the following illustration:

I hope this article will help you with your Java programming.