[java] java.net and java.nio question

/** * NIOUtility.java */package net.java.dev.bta.network.nio.common;import java.nio.*;import java.nio.channels.*;/** * * Miscelanious of methods to work with NIO * From: http://brackeen.com/javagamebook/ */public class NIOUtility {        /**     *     * First, it writes the Header. Then, it writes the GameEvent into the     * given ByteBuffer. That's when the Channel writes out the data.     * @param event The event to be written     * @param writeBuffer The ByteBuffer to be prepared     */    public static void prepBuffer(GameEvent event, ByteBuffer writeBuffer) {                writeBuffer.clear();        writeBuffer.putInt(0); // clientId?                int sizePos = writeBuffer.position();        writeBuffer.putInt(0); // placeholder for payload size                // write event        int payloadSize = event.write(writeBuffer);                // insert the payload size in the placeholder spot        writeBuffer.putInt(sizePos, payloadSize);                // prepare for a channel.write        writeBuffer.flip();            }            /**     * Writes the contents of a ByteBuffer to the given SocketChannel     * @param channel The Channel where the data will be written     * @param writeBuffer The ByteBuffer containing the data to be written     */    public static void channelWrite(SocketChannel channel, ByteBuffer writeBuffer) {                long nbytes = 0;        long toWrite = writeBuffer.remaining();                // loop on the channel.write() call since it will not necessarily        // write all bytes in one shot        try {            while (nbytes != toWrite) {                nbytes += channel.write(writeBuffer);                                try {                    Thread.sleep(Globals.CHANNEL_WRITE_SLEEP);                } catch (InterruptedException e) {}            }        } catch (ClosedChannelException cce) {        } catch (Exception e) {        }                // get ready for another write if needed        writeBuffer.rewind();            }        /**     * Write a String to a ByteBuffer,     * Prepended with a short integer representing the length of the String     * @param buff The ByteBuffer to receive the String     * @param str The String to be written on the ByteBuffer buff     */    public static void putStr(ByteBuffer buff, String str) {        if (str == null)            buff.putShort( (short) 0 );        else {            buff.putShort( (short) str.length() );            buff.put( str.getBytes() );        }    }        /**     * Read a String from a ByteBuffer that was written w/the putStr method     * @param buff The ByteBuffer to read from     */    public static String getStr(ByteBuffer buff) {        short len = buff.getShort();        if (len == 0)            return null;        else {            byte[] b = new byte[ len ];            buff.get(b);            return new String(b);        }    }    }

// exampleClientConnection conn = new ClientConnection();conn.addIOListener( myMessageHandler );conn.start();conn.connect( /*address*/ );// .. I'm done!!!