File Input Output Java

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.channels.FileChannel;
public class Main {
  public static void main(String[] argv) throws Exception {
    FileChannel srcChannel = new FileInputStream("srcFilename").getChannel();
    FileChannel dstChannel = new FileOutputStream("dstFilename").getChannel();
    dstChannel.transferFrom(srcChannel, 0, srcChannel.size());
    srcChannel.close();
    dstChannel.close();
  }
}