File copy functionality implementation

Question

I am giving two efficient ways of file copying functional implemantation.
     * Generic method to copy file from one location to other location
     * @param in : source file path name
     * @param out : destination file path name
     * @throws IOException
    public static void copyFile(String in, String out)
    throws Exception
        String copyCommand = "cmd /c copy "+in+" "+out;
        Process pr;
        try {
            pr = Runtime.getRuntime().exec(copyCommand);
            int exitValue = pr.waitFor();
        } catch (IOException e) {
            throw e;
        } catch (InterruptedException e) {
            throw e;
     }and
To copyFile using java.nic.io
    public static void copyFile(File in, File out)
    throws IOException
     FileChannel inChannel = new
         FileInputStream(in).getChannel();
     FileChannel outChannel = new
         FileOutputStream(out).getChannel();
     try {
         inChannel.transferTo(0, inChannel.size(),
                 outChannel);
     catch (IOException e) {
         throw e;
     finally {
         if (inChannel != null) inChannel.close();
         if (outChannel != null) outChannel.close();
7. // Copies src file to dst file.
// If the dst file does not exist, it is created
    void copy(File src, File dst) throws IOException {
        InputStream in = new FileInputStream(src);
        OutputStream out = new FileOutputStream(dst);
        // Transfer bytes from in to out
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        in.close();
        out.close();
    }

Answer 1

SomasekharPatil wrote:
still totally useless
It's truly terribleWe should never tell any thing like "useless" and "terrible"Yes we should. When there are multiple ways to solve a problem but one or two of them are much better than the third then the third is useless and terrible. There are more then enough terrible blogs and terrible sites (roseindia I'm looking at you) with more then enough terrible ideas and code samples that demonstrate how not to do things. Those sorts of "resources" only cause confusion among the naive and code that is messy, hacky and mostly just doesn't work.
Nothing is useless in this universe.You haven't seen enough code yet.
That method can also be used in requirements where it best suits! who knows what customer requirements are?What sort of requirement is it that is going to make that code useful?