FileChannel: transferFrom(ReadableByteChannel src, long position, long count)

 
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.channels.FileChannel;

public class Main {

  public static void main(String[] args) {
    FileChannel in = null;
    FileChannel out = null;

    if (args.length < 2) {
      System.out.println("Usage: java Copy <from> <to>");
      System.exit(1);
    }

    try {
      in = new FileInputStream(args[0]).getChannel();
      out = new FileOutputStream(args[1]).getChannel();
      out.transferFrom(in, 0L, (int) in.size());

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

}