Where does Oracle (Sun) install their JDK/JRE on Mac OS X 10.8 Mountain Lion?
Enough answers here, but I'm JUST adding a way to find it by yourself
$ sudo find / -name Java
/Library/Application Support/Oracle/Java
/Library/Java
/private/var/root/Library/Application Support/Oracle/Java
/System/Library/Java
/Users/prayagupd/Library/Application Support/Oracle/Java
To be more specific,
$ sudo find / -name jdk*
/Applications/Android Studio.app/Contents/jre/jdk
/Applications/Android Studio.app/Contents/lib/jdkAnnotations.jar
/Applications/IntelliJ IDEA.app/Contents/jre/jdk
/Applications/IntelliJ IDEA.app/Contents/lib/jdkAnnotations.jar
/Library/Java/JavaVirtualMachines/jdk1.7.0_76.jdk
You see /Library/Java/JavaVirtualMachines/ is the place you need to look inside.
And /Library/Java/JavaVirtualMachines/jdk is your JAVA_HOME
$ ls -ls /Library/Java/JavaVirtualMachines/jdk1.7.0_76.jdk/Contents/Home/
total 39776
8 -rw-rw-r-- 1 root wheel 3339 Dec 18 2014 COPYRIGHT
8 -rw-rw-r-- 1 root wheel 40 Dec 18 2014 LICENSE
8 -rw-rw-r-- 1 root wheel 114 Dec 18 2014 README.html
216 -rw-rw-r-- 1 root wheel 110114 Dec 17 2014 THIRDPARTYLICENSEREADME-JAVAFX.txt
344 -rw-rw-r-- 1 root wheel 173559 Dec 18 2014 THIRDPARTYLICENSEREADME.txt
0 drwxrwxr-x 44 root wheel 1496 Feb 28 20:13 bin
0 drwxrwxr-x 9 root wheel 306 Feb 28 20:13 db
0 drwxrwxr-x 9 root wheel 306 Feb 28 20:13 include
0 drwxrwxr-x 10 root wheel 340 Feb 28 20:13 jre
0 drwxrwxr-x 14 root wheel 476 Feb 28 20:13 lib
0 drwxrwxr-x 5 root wheel 170 Dec 18 2014 man
8 -rw-rw-r-- 1 root wheel 502 Dec 18 2014 release
39184 -rw-rw-r-- 1 root wheel 20061067 Dec 18 2014 src.zip