http://www.java.com/en/download/help/mac_uninstall_java.xml
sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -fr /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk
How do I uninstall Java 7 and later versions on my Mac?
原文：http://www.cnblogs.com/ZacharyHodgeZou/p/4301800.html