Java - C, C Plus Plus A, Agar, S C Libraries

There are some libraries that a can sort of make things cross form. Diwat is not use like open g on the bank andor rit, so it hase several different back ends. Ab, do you know any like you want to throw in one or two s c libraries? He, i don't know of any c ones. Om, agar is a c library for am, forgus, that is cross platform.