req.onreadystatechange = processReqChange;

function processReqChange() 
{
    // only if req shows "complete"
    if (req.readyState == 4) {
        // only if "OK"
        if (req.status == 200) 
	{
            // ...processing statements go here...
	    processResponse();
        } else {
            alert("There was a problem retrieving 
               the XML data:\n" + req.statusText);
        }
    }
}

function processResponse()
{
    response  = req.responseXML.documentElement;
    method    = response.getElementsByTagName('method')[0].firstChild.data;
    result    = response.getElementsByTagName('result')[0].firstChild.data;
    eval(method + '(\'\', result)');

}

    try 
    {
        InetAddress addr = InetAddress.getByName("yahoo.com");
        byte[] ipAddr = addr.getAddress();

        // Convert to dot representation
        String ipAddrStr = "";
        for (int i=0; i<ipAddr.length; i++) {
            if (i > 0) {
                ipAddrStr += ".";
            }
            ipAddrStr += ipAddr[i]&0xFF;
        }
    } 
    catch (UnknownHostException e) {
    }

2. Getting the Hostname of an IP Address

try {
        // Get hostname by textual representation of IP address
        InetAddress addr = InetAddress.getByName("127.0.0.1");

        // Get hostname by a byte array containing the IP address
        byte[] ipAddr = new byte[]{127, 0, 0, 1};
        addr = InetAddress.getByAddress(ipAddr);

        // Get the host name
        String hostname = addr.getHostName();

        // Get canonical host name
        String hostnameCanonical = addr.getCanonicalHostName();
    } catch (UnknownHostException e) {
    }

3. Getting the IP Address and Hostname of the Local Machine

    try {
        InetAddress addr = InetAddress.getLocalHost();

        // Get IP Address
        byte[] ipAddr = addr.getAddress();

        // Get hostname
        String hostname = addr.getHostName();
    } catch (UnknownHostException e) {
    }

-- How to put a project under CVS

-- Basic CVS Usage

-- Using CVS with Multiple Developers

• HINT: cvs checkout project

• HINT: cvs commit -m "Added a YOU" bar.c

• HINT: cvs commit -m "Added YOU" foo.c

===================================================================
File: foo.c             Status: Needs Merge

   Working revision:    1.1.1.1 'Some Date'
   Repository revision: 1.2     /class/'username'/cvsroot/project/foo.c,v
   Sticky Tag:          (none)
   Sticky Date:         (none)
   Sticky Options:      (none)

The file is identical with the latest revision in the repository.

You have edited the file, and not yet committed your changes.

Someone else has committed a newer revision to the repository.

Someone else has committed a newer revision to the repository, and you have also made modifications to the file.

void foo()
{
  printf("FOO\n");
<<<<<<< foo.c
  printf("TOO\n");
=======
  printf("YOU\n");
>>>>>>> 1.2
}

-- Additional CVS Commands

• Get a working copy of the module.
• Create the new file inside your working copy.
• use cvs add filename to tell CVS to version control the file.
• use cvs commit filename to check in the file to the repository.

• Make sure you haven't made any uncommitted modifications to the file.
• Remove the file from the working copy of the module. rm filename.
• use cvs remove filename to tell CVS you want to delete the file.
• use cvs commit filename to actually perform the removal from the repository.

try 
{
       BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
       String str = "";
       while (str != null) 
       {
          System.out.print("> some prompt ");
          str = in.readLine();
	  dosomethingwith(str);
       }
} 
catch (IOException e) 
{
}

try 
{
     BufferedReader in = new BufferedReader(new FileReader("filename"));
     String str;
     while ((str = in.readLine()) != null) 
     {
	dosomethingwith(str);
     }
     in.close();
} 
catch (IOException e) 
{
}

    // Returns the contents of the file in a byte array.
    public static byte[] getBytesFromFile(File file) throws IOException 
    {
        InputStream is = new FileInputStream(file);

        // Get the size of the file
        long length = file.length();

        // You cannot create an array using a long type.
        // It needs to be an int type.
        // Before converting to an int type, check
        // to ensure that file is not larger than Integer.MAX_VALUE.
        if (length > Integer.MAX_VALUE) 
	{
            // File is too large
        }

        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];

        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length
               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) 
	{
            offset += numRead;
        }

        // Ensure all the bytes have been read in
        if (offset < bytes.length) 
	{
            throw new IOException("Could not completely read file "+file.getName());
        }

        // Close the input stream and return bytes
        is.close();
        return bytes;

    }

try 
{
    BufferedWriter out = new BufferedWriter(new FileWriter("filename"));
    out.write("some string");
    out.close();
} 
catch (IOException e) 
{
}

try 
{
     BufferedWriter out = new BufferedWriter(new FileWriter("filename", true));
     out.write("appending String");
     out.close();
} 
catch (IOException e) 
{
}

try 
{
     File f = new File("filename");
     RandomAccessFile raf = new RandomAccessFile(f, "rw");

     // Read a character
     char ch = raf.readChar();

     // Seek to end of file
     raf.seek(f.length());

     // Append to the end
     raf.writeChars("aString");
     raf.close();
} 
catch (IOException e) 
{
}