package io;

import java.nio.*;

import java.nio.channels.*;

import java.io.*;

import java.util.*;

/**

* RUN:

* javac io/GetChannel.java && java io.GetChannel

*

* OUTPUT:

*

*/

public class GetChannel {

private static final int BSIZE = 1024;

public static void main(String[] args) throws Exception {

// write in file

FileChannel fc = new FileOutputStream("io/data.txt").getChannel();

fc.write(ByteBuffer.wrap("Some text ".getBytes()));

fc.close();

// append to end of file

fc = new RandomAccessFile("io/data.txt", "rw").getChannel();

fc.position(fc.size()); // move to end of file

fc.write(ByteBuffer.wrap("Some more ".getBytes()));

fc.close();

// read from file

fc = new FileInputStream("io/data.txt").getChannel();

// ByteBuffer buff = ByteBuffer.allocateDirect(BSIZE);

ByteBuffer buff = ByteBuffer.allocate(BSIZE);

fc.read(buff);

buff.flip();

while (buff.hasRemaining()) {

System.out.print((char)buff.get());

}

}

}