All temporary files must be stored in temporary directory

see Real's how-to: Create a temporary file

The location of the directory used to hold temporary files is defined by the property java.io.tmpdir. The default value can be changed with the command line used to launch the JVM :

java -Djava.io.tmpdir=C:\mydir  myClass

or , on Windows, you can set the environment variable TMP to a different value.

On some plateform, the temporary directory returned by java.io.tmpdir do not include a trailing slash. That is,

Win NT  --> C:\TEMP\
Win XP  --> C:\TEMP
Solaris --> /var/tmp/
Linux   --> /var/tmp

It's not a bad idea to check if there is a trailing slash or not.

String tempdir = System.getProperty("java.io.tmpdir");

if ( !(tempdir.endsWith("/") || tempdir.endsWith("\\")) )
   tempdir = tempdir + System.getProperty("file.separator");

See Sun RFE #4735419

File f=File.createTempFile(...);
f.delete();
f.mkdir();

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