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Wrong forum, but: all Nooks run a nailed-down version of Android, and so all apps are written in java.
There isn't a native app development environment on stock devices. The OS can be replaced with an open version; see http://forum.xda-developers.com/forumdisplay.php?f=864 for enlightenment. It's not suitable for those who don't do their own research.
Nook Color is Android 2.2 with a Skinned OS/UI layer on top of it.
Nook Tablet is Android 2.3
Nook HD is Android 4.0.3.
Nook HD+ is Android 4.0.3.
Why do you want to download Java?
To play games on pogo.com.