Question

I am executing an application using Java application (Runtime.get…) but now before running the application I have to set temp path.

set tmpdir=%temp%

Is it anyway I can execute above command using Java?

Answer 1

Running set in a separate Runtime.exec() invocation wouldn’t help at all: it only ever affects the process that it runs in and each exec() call produces its own process.

What you need to do instead is provide the environment variable to your Runtime.exec() call using this two or three argument variant.

Better yet, scrap Runtime.exec() and use ProcessBuilder instead. With this you can simply use environment().put("tmpdir", "somevalue") to set the environment variable you want (you can even get the value of %temp% from that Map).