// newio/TransferTo.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// Using transferTo() between channels
// {Args: TransferTo.java TransferTo.txt}
import java.nio.channels.*;
import java.io.*;

public class TransferTo {
  public static void
  main(String[] args) throws Exception {
    if(args.length != 2) {
      System.out.println(
        "arguments: sourcefile destfile");
      System.exit(1);
    }
    try(FileChannel in = new FileInputStream(
          args[0]).getChannel();
        FileChannel out = new FileOutputStream(
          args[1]).getChannel()) {
      in.transferTo(0, in.size(), out);
      // Or:
      // out.transferFrom(in, 0, in.size());
    }
  }
}