Install JUnit with Oracle Java 7 already instaled

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http://askubuntu.com – I am running Ubuntu 12.10 with Oracle Java 7 installed (as described here). I want to install JUnit 4 but if I do a simple sudo apt-get install junit, it starts to download openjdk and the like (which I don't want). How to manually do it? And from where do I download and install. Please help! (HowTos)