import java.nio.channels.FileChannel;

import java.nio.ByteBuffer;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class Copy{

public static void main(String[] args){

if(args.length != 2){

System.err.println("usage: java Copy srcFile destFile");

return;

}

FileChannel inChannel = null;

FileChannel outChannel = null;

try{

FileInputStream fis = new FileInputStream(args[0]);

FileOutputStream fos = new FileOutputStream(args[1]);

inChannel = fis.getChannel();

outChannel = fos.getChannel();

ByteBuffer buffer = ByteBuffer.allocate(128);

while(inChannel.read(buffer) != -1){

buffer.flip();

outChannel.write(buffer);

buffer.compact();

}

}catch(IOException ioe){

ioe.printStackTrace();

}finally{

if(inChannel!=null){

try{

inChannel.close();

}catch(IOException ioe){

ioe.printStackTrace();

}

}

if(outChannel != null){

try{

outChannel.close();

}catch(IOException ioe){

ioe.printStackTrace();

}

}

}

}

}