Does someone know where i can find the actually coding of java classes... And where i can find the. .... Class of that classes

Question

like System class like Math class etc

Answer 1

Thanks
[H A P P Y TO HELP]

Answer 2

you are not sure in that??

Answer 3

「ＨＡＰＰＹ ＴＯ ＨＥＬＰ」
So why we say that..
java is a open source technology..
if we cant see the source code..