Top 10 websites for advanced level java developer

URL: http://stackoverflow.com/

URL: http://www.dzone.com

URL: http://leetcode.com/

URL: http://docs.oracle.com/javase/

URL: https://github.com/

URL: https://www.coursera.org/

URL: http://www.javaworld.com/

URL: http://www.ibm.com/developerworks/java/

URL: http://en.wikipedia.org/wiki/

URL: http://www.programcreek.com/