Re: Miscellaneous improvements to "jar".

[Ulf Zibis]

Additional 2 cents, I more would like:

+ return File.createTempFile("jartmp", null, (dir != null ? dir : new File(".")));

or:

+        return File.createTempFile("jartmp", null,
+               dir != null ? dir : new File("."));

-Ulf