JAVA 入门 - daaoling/daaoling.github.io GitHub Wiki
How To Install Java 8 on Mac
https://gist.github.com/tomysmile/a9a7aee85ff73454bd57e198ad90e614
https://blog.jayway.com/2014/01/15/how-to-switch-jdk-version-on-mac-os-x-maverick/
http://www.mkyong.com/java/how-to-set-java_home-environment-variable-on-mac-os-x/