Environment variable equivalent to conserve String

I want to know if it's possible to create a variable like an envornement variable but that is capable to conserve a string ?

I want to do this because i'm doing java test and i have plenty of website to test, and i'm always doing the same tests

My architecture is very special, but to resume, i want to create a shell script that will specify the website URL and be stored in this variable and then run the java test get this variable and run.

Any ideas ?