guide me

[J a h a n z e b F a h i m]

hi
i am a java developer, i want to install gnu java compiler on LINUX
7.2 for testing purpose. i already have gcc version 4.8.5 20150623
(Red Hat 4.8.5-4) (GCC) in my machine. now i want to add gcj in it.
how can i install it?

-- 
regards
jahanzeb