Исходный текст программы FileStreams.java

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// ==========================================
// FileStreams.java
//(C) Alexandr Frolov, 1998
// E-mail: frolov@glasnet.ru
// Web:    http://www.glasnet.ru/~frolov 
// ==========================================

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class FileStreams
{
  public static void main(String args[])
  {
    FrameWindow frame;
    frame =  new FrameWindow(
      "Simplest Java Notepad");
    frame.setVisible(true);
  }
}

// =======================================
// Class FrameWindow
// =======================================
class FrameWindow extends Frame
  implements ActionListener, WindowListener
{
  TextArea ta;
  
  MenuBar mb;
  
  Menu mFile;
  MenuItem miOpen;
  MenuItem miSave;
  MenuItem miSaveAs;
  MenuItem miExit;
  
  String szCurrentFilename = "";
  byte buf[];
  
  // ============================================
  // FrameWindow
  // ============================================
  public FrameWindow(String szTitle)
  {
    super(szTitle);
    setSize(400, 300);
    
    mb = new MenuBar();
    mFile = new Menu("File");
    
    miOpen = new MenuItem("Open...");
    mFile.add(miOpen);
    
    miSave = new MenuItem("Save");
    mFile.add(miSave);
    
    miSaveAs = new MenuItem("Save As...");
    mFile.add(miSaveAs);
    
    mFile.add("-");
    
    miExit = new MenuItem("Exit");
    mFile.add(miExit);
    
    mb.add(mFile);
    
    miOpen.addActionListener(this);
    miSave.addActionListener(this);
    miSaveAs.addActionListener(this);
    miExit.addActionListener(this);
    
    setMenuBar(mb);
    
    this.addWindowListener(this);
    
    ta = new TextArea(10, 30);
    setLayout(new BorderLayout());
    add("Center", ta);
    
  }

  // ============================================
  // actionPerformed
  // ============================================
  public void actionPerformed(ActionEvent e)
  {
    if(e.getSource().equals(miOpen))
    {
      FileOpen();
    }
    
    else if(e.getSource().equals(miSave))
    {
      FileSave();
    }
    
    else if(e.getSource().equals(miSaveAs))
    {
      FileSaveAs();
    }
    
    else if(e.getSource().equals(miExit))
    {
      setVisible(false);
      System.exit(0);
    }
  }
  
  // ============================================
  // windowClosing
  // ============================================
  public void windowClosing(WindowEvent e)
  {
    setVisible(false);
    System.exit(0);
  }
  
  public void windowOpened(WindowEvent e) {}
  public void windowClosed(WindowEvent e) {}
  public void windowIconified(WindowEvent e) {}
  public void windowDeiconified(WindowEvent e) {}
  public void windowActivated(WindowEvent e) {}
  public void windowDeactivated(WindowEvent e) {}
  
  // ============================================
  // FileOpen
  // ============================================
  void FileOpen()
  {
    FileDialog fdlg;
    FileInputStream is = null;
    
    fdlg = new FileDialog(this, "Open file", 
	FileDialog.LOAD);
    fdlg.show();

    szCurrentFilename = fdlg.getDirectory() +
      fdlg.getFile();
      
    setTitle("Simplest Java Notepad" + " - " +
      szCurrentFilename);
    
    try 
    {
      is = new FileInputStream(
        szCurrentFilename);
    }
    catch (FileNotFoundException ex)
    {
      System.out.println(ex.toString());
    }
    catch (SecurityException ex)
    {
      System.out.println(ex.toString());
    }
    
    try
    {
      buf = new byte[is.available()];
      is.read(buf);
    }
    catch (IOException ex)
    {
      System.out.println(ex.toString());
    }
    
    ta.selectAll();
    ta.replaceRange(
      "", 0, ta.getSelectionEnd());
    
    String szStr = new String(buf);
    StringTokenizer st;
    
    st = new StringTokenizer(szStr, "\r\n");
    
    while(st.hasMoreElements())
    {
      szStr = new String(
        (String)st.nextElement());
      ta.append(szStr + "\r\n");
    }  

    try
    {
      is.close();
    }
    catch (IOException ex)
    {
      System.out.println(ex.toString());
    }
  }  
  
  // ============================================
  // FileSaveAs
  // ============================================
  void FileSaveAs()
  {
    FileDialog fdlg;
    fdlg = new FileDialog(
      this, "Save file as...", 
      FileDialog.SAVE);
    fdlg.show();

    if(fdlg.getDirectory() == null ||
      fdlg.getFile() == null)
      return;
    
    szCurrentFilename = fdlg.getDirectory() +
      fdlg.getFile();
      
    setTitle("Simplest Java Notepad" + " - " +
      szCurrentFilename);
      
    FileSave();
  }  
  
  // ============================================
  // FileSave
  // ============================================
  void FileSave()
  {
    FileOutputStream os = null;
    
    String sz = ta.getText();
    buf = sz.getBytes();
    
    try 
    {
      os = new FileOutputStream(
        szCurrentFilename);
      os.write(buf);
      os.close();
      
    }
    catch (IOException ex)
    {
      System.out.println(ex.toString());
    }
    catch (SecurityException ex)
    {
      System.out.println(ex.toString());
    }
  }  
}

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