programming-examples/java/Core_Java/Notepad.java

Notepad

import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import java.io.*;
public class Editor extends Frame
    {
     String filename;
     TextArea tx;
     Clipboard clip = getToolkit().getSystemClipboard();
     Editor()
         {
         setLayout(new GridLayout(1,1));
         tx = new TextArea();
         add(tx);
         MenuBar mb = new MenuBar();
         Menu F = new Menu("file");
         MenuItem n = new MenuItem("New");
         MenuItem o = new MenuItem("Open");
         MenuItem s = new MenuItem("Save");
         MenuItem e = new MenuItem("Exit");
         n.addActionListener(new New());
         F.add(n);
         o.addActionListener(new Open());
         F.add(o);
         s.addActionListener(new Save());
         F.add(s);
         e.addActionListener(new Exit());
         F.add(e);
         mb.add(F);
         Menu E = new Menu("Edit");
         MenuItem cut = new MenuItem("Cut");
         MenuItem copy = new MenuItem("Copy");
         MenuItem paste = new MenuItem("Paste");
         cut.addActionListener(new Cut());
         E.add(cut);
         copy.addActionListener(new Copy());
         E.add(copy);
         paste.addActionListener(new Paste());
         E.add(paste);
         mb.add(E);
         setMenuBar(mb);
        
         mylistener mylist = new mylistener();
         addWindowListener(mylist);
     }
     
     class mylistener extends WindowAdapter
         {
         public void windowClosing (WindowEvent e)
             {
             System.exit(0);
         }
     }
    
     class New implements ActionListener
         {
         public void actionPerformed(ActionEvent e)
             {
             tx.setText(" ");
             setTitle(filename);
         }
     }
     
     class Open implements ActionListener
         {
         public void actionPerformed(ActionEvent e)
             {
             FileDialog fd = new FileDialog(Editor.this, "select File",FileDialog.LOAD);
             fd.show();
             if (fd.getFile()!=null)
                 {
                 filename = fd.getDirectory() + fd.getFile();
                 setTitle(filename);
                 ReadFile();
             }
             tx.requestFocus();
         }
     }
     
     class Save implements ActionListener
         {
         public void actionPerformed(ActionEvent e)
             {
             FileDialog fd = new FileDialog(Editor.this,"Save File",FileDialog.SAVE);
             fd.show();
             if (fd.getFile()!=null)
                 {
                 filename = fd.getDirectory() + fd.getFile();
                 setTitle(filename);
                 try
                     {
                     DataOutputStream d = new DataOutputStream(new FileOutputStream(filename));
                     String line = tx.getText();
                     BufferedReader br = new BufferedReader(new StringReader(line));
                     while((line = br.readLine())!=null)
                         {
                         d.writeBytes(line + "\r\n");
                         d.close();
                     }
                 }
                 catch(Exception ex)
                     {
                     System.out.println("File not found");
                 }
                 tx.requestFocus();
             }
         }
     }
     
     class Exit implements ActionListener
         {
         public void actionPerformed(ActionEvent e)
             {
             System.exit(0);
         }
     }
     void ReadFile()
         {
         BufferedReader d;
         StringBuffer sb = new StringBuffer();
         try
             {
             d = new BufferedReader(new FileReader(filename));
             String line;
             while((line=d.readLine())!=null)
             sb.append(line + "\n");
             tx.setText(sb.toString());
             d.close();
         }
         catch(FileNotFoundException fe)
             {
             System.out.println("File not Found");
         }
         catch(IOException ioe){}
     }
    
     class Cut implements ActionListener
         {
         public void actionPerformed(ActionEvent e)
             {
             String sel = tx.getSelectedText();
             StringSelection ss = new StringSelection(sel);
             clip.setContents(ss,ss);
             tx.replaceRange(" ",tx.getSelectionStart(),tx.getSelectionEnd());
         }
     }
     
     class Copy implements ActionListener
         {
         public void actionPerformed(ActionEvent e)
             {
             String sel = tx.getSelectedText();
             StringSelection clipString = new StringSelection(sel);
             clip.setContents(clipString,clipString);
         }
     }
     
     class Paste implements ActionListener
         {
         public void actionPerformed(ActionEvent e)
             {
             Transferable cliptran = clip.getContents(Editor.this);
             try
                 {
                 String sel = (String) cliptran.getTransferData(DataFlavor.stringFlavor);
                 tx.replaceRange(sel,tx.getSelectionStart(),tx.getSelectionEnd());
             }
             catch(Exception exc)
                 {
                 System.out.println("not string flavour");
             }
         }
     }
     
     public static void main(String args[])
         {
         Frame f = new Editor();
         f.setSize(500,400);
         f.setVisible(true);
         f.show();
     }
}