Getting Channels From Streams

package com.bruceeckel;
 
//: c12:GetChannel.java
//Getting channels from streams
//{Clean: data.txt}
//From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
//www.BruceEckel.com. See copyright notice in CopyRight.txt.
 
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
 
public class GetChannel {
    private static final int BSIZE = 1024;
 
    public static void main(String[] args) throws Exception {
	// Write a file:
	FileChannel fc = new FileOutputStream("data.txt").getChannel();
	fc.write(ByteBuffer.wrap("Some text ".getBytes()));
	fc.close();
	// Add to the end of the file:
	fc = new RandomAccessFile("data.txt", "rw").getChannel();
	fc.position(fc.size()); // Move to the end
	fc.write(ByteBuffer.wrap("Some more".getBytes()));
	fc.close();
	// Read the file:
	fc = new FileInputStream("data.txt").getChannel();
	ByteBuffer buff = ByteBuffer.allocate(BSIZE);
	fc.read(buff);
	buff.flip();
	while (buff.hasRemaining())
	    System.out.print((char) buff.get());
    }
}