Difference between volatile and atomic

The memory model of volatile:
http://blog.csdn.net/basycia/article/details/52058986
The difference between volatile and atomic class atomic:
http://blog.csdn.net/jurson99/article/details/53406849
atomic guarantees class atomic nature, volitile guarantees visibility of multiple threads
http://blog.csdn.net/a_yyc1990/article/details/41478639
atomic uses cas to ensure update atomicity:
cas introduction:
https://www.cnblogs.com/Mainz/p /3546347.html