although there are OO perl modules, most are not OO. if a perl module needs to rely on other modules, it will generally have "use" directives at the top. Likewise, you'd "use File::Find" to make use of the functionality. Follow the module help as to how to use it.
note though that you'll get more done in perl if you stop thinking all the time in terms of java OO analogies, as perl is not a strictly typed language like java. you'll get used to it, and enjoy the convenience and flexibility.