File not getting deleted using File.delete()

Question

Hi guys,
I have a code like this:
File tempdir = new File("tempdir");
tempdir.mkdir();
File temporaryFile = new File("tempdir\tempfile.txt");
FileWriter writer = new FileWriter(temporaryFile);
// write data into file
writer.flush();
writer.close();
try {
    // Do something
catch (Exception e) {
    // Do something
temporaryFile.delete();
tempdir.delete();The program runs successfully. The directory and the file is created and data is written successfully into it. However, the file as well as directory is not getting deleted at the end of the program. I tried temporaryFile.deleteOnExit(), but this also didn't help.
Can anyone provide some input as to what can be the possible reasons for the file not getting deleted?
Thanks..

Answer 1

I want the file to be created inside the directory I specified. Hence, I put the "\". Please let me know if there is some other way to achieve this. This way I am getting the file created at the location I want.
One more interesting thing which I noticed. Actually this code is part of a JUnit test. In the same JUnit, I am creating new files in atleast 2-3 test methods. But the deletion of files is really random. Sometimes, 2 out of 3 get deleted, sometimes only 1 gets deleted. However, I didn't come through a single instance wherein all the 3 files got deleted. :-(
Also, the directory is never deleted. However, I got the reason behind this. As per the File API, the directory will not be deleted if it is not empty.