Save file in another directory

I have been trying so many solutions for the past one week. Nothing seems to strike. Code just works fine. The merged file is empty when i move it to another directory.
This is the code snippet where the data is appended and sent to another directory.

private void readAndAppend() //reading the files and appending them
{
File fileOut = new File(this.directory, fileName); //new input
//fileOut.delete();
if (fileOut.exists())
{
fileOut.delete();
} // end if block
//creation of the appended file
try
{
fileOut.createNewFile();
System.out.println("File: '" + fileOut.getAbsolutePath() + "' created successfully");
fileOut.renameTo(new File("Directory to which the merged file is sent" + fileOut.getName()));
} //ends try block
catch (IOException err )
{
err.printStackTrace(System.err);
} // ends catch block