How can I move the files on unix with java?

I write java in netbeans.I want to move files and create files.When I run the program on netbeans it works. Files creates and moved. But when I run program on the jar it doesnot copy or move. I give permisson jar and files for read , write. But it does not works.And I open jar with root user. how can i fix this?

this is my code to copy

package aaa;


public class MoveFolder 
    public   int copy(String from,String where  )
        int onay=0;
        File srcFolder = new File(from);
        File destFolder = new File(where);

        //make sure source exists

           System.out.println("Directory does not exist."); 
            onay = -1;
          // JOptionPane.showMessageDialog(null, "Directory does not exist.");


           }catch(IOException e){
                onay = -1;
           //    JOptionPane.showMessageDialog(null, "Was not Copied.");

         return onay;

    public   void copyFolder(File src, File dest)
        throws IOException{


            //if directory not exists, create it
               System.out.println("Directory copied from " 
                              + src + "  to " + dest);
          //          JOptionPane.showMessageDialog(null, "Directory copied from " + src + "  to " + dest);

            //list all the directory contents
            String files[] = src.list();

            for (String file : files) {
               //construct the src and dest file structure
               File srcFile = new File(src, file);
               File destFile = new File(dest, file);
               //recursive copy

            //if file, then copy it
            //Use bytes stream to support all file types

            InputStream in = new FileInputStream(src);
                OutputStream out = new FileOutputStream(dest); 

                byte[] buffer = new byte[1024];

                int length;
                //copy the file content in bytes 
                while ((length = > 0){
                   out.write(buffer, 0, length);

                System.out.println("File copied from " + src + " to " + dest);
         //       JOptionPane.showMessageDialog(null, "File copied from " + src + " to " + dest);



Why are you copying files with IO streams? Why not just do

File f; // bla bla init
File otherFile;

Also, you need read and write permissions on the files you're trying to move (to), not on the jars you're executing ...

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