java - I want to use parent directory‘s parent directory

Question

I am making a Java program and I want use parent directory’s parent directory， as I want to change the content of a file which is in that directory.

So far I tried :

static File pdir = new File(System.getProperty("user.dir")).getParentFile();
static File pdir2 = new File(System.getProperty("pdir")).getParentFile();

and some other things like that but none of them worked.

Error, on the second line, was:

Exception in thread "main" java.lang.ExceptionInInitializerError at Plugin.main.main(main.java:20) Caused by: java.lang.NullPointerException at java.base/java.io.File.(File.java:278) at Plugin.pfun.(pfun.java:13) ... 1 more

Can you recommend anything?

Answer 1

Change the second line to

static File pdir2 = pdir.getParentFile();