import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] args) throws IOException {
FileInputStream inFile = new FileInputStream(args[0]);
FileOutputStream outFile = new FileOutputStream(args[1]);
FileChannel inChannel = inFile.getChannel();
FileChannel outChannel = outFile.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(1024 * 1024);
int bytesRead = 0;
while (bytesRead >= 0 || buffer.hasRemaining()) {
if (bytesRead != -1)
bytesRead = inChannel.read(buffer);
buffer.flip();
outChannel.write(buffer);
buffer.compact();
}
inChannel.close();
outChannel.close();
}
}