Install JDK under Mac

Originating from http://blog.csdn.net/collonn/article/details/28483109:

Mac OS 10.9 installs jdk1.6.
The Java provided by Apple is installed in the/system/library/frameworks/javavm.framework/directory, so let's look at what's in this directory.
Let's see where Java is, run the following command
>>whereis Java
/usr/bin/java
>>ls-l/usr/bin/java
Lrwxr-xr-x 1 root Wheel 5 23:08/usr/bin/java-/system/library/frameworks/javavm.framework/versions/current /commands/java
See, this is a soft connection,/usr/bin/java actually point to the really entertaining file is the back of that Java file, OK, let's see what's in the directory where this Java file is
>>ls-l/system/library/frameworks/javavm.framework/versions/current/commands/
Drwxr-xr-x Root Wheel 1530 5 20 23:08.
Drwxr-xr-x 7 Root Wheel 238 5 20 23:08..
-rwxr-xr-x 1 root Wheel 54640 5 23:08 appletviewer
-rwxr-xr-x 1 root wheel 54624 5 23:08 Apt
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Extcheck
-rwxr-xr-x 1 root Wheel 54624 5 23:08 IDLJ
-rwxr-xr-x 1 root wheel 54624 5 23:08 jar
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Jarsigner
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Java
-rwxr-xr-x 1 root Wheel 68224 5 23:08 java_home
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Javac
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Javadoc
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Javah
-rwxr-xr-x 1 root Wheel 54624 5 23:08 JAVAP
-rwxr-xr-x 1 root Wheel 49584 5 23:08 javaws
-rwxr-xr-x 1 root Wheel 54624 5 23:08 jcmd
-rwxr-xr-x 1 root Wheel 54640 5 23:08 jconsole
-rwxr-xr-x 1 root Wheel 54624 5 23:08 jdb
-rwxr-xr-x 1 root Wheel 54624 5 23:08 jhat
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Jinfo
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Jmap
-rwxr-xr-x 1 root Wheel 54624 5 23:08 JMC
-rwxr-xr-x 1 root Wheel 54624 5 23:08 JPS
-rwxr-xr-x 1 root Wheel 54640 5 23:08 jrunscript
-rwxr-xr-x 1 root Wheel 54640 5 23:08 jsadebugd
-rwxr-xr-x 1 root Wheel 54624 5 23:08 jstack
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Jstat
-rwxr-xr-x 1 root Wheel 54624 5 23:08 jstatd
-rwxr-xr-x 1 root Wheel 54640 5 23:08 JVISUALVM
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Keytool
-rwxr-xr-x 1 root Wheel 54640 5 23:08 native2ascii
-rwxr-xr-x 1 root Wheel 54624 5 23:08 ORBD
-rwxr-xr-x 1 root Wheel 54640 5 23:08 pack200
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Policytool
-rwxr-xr-x 1 root Wheel 54624 5 23:08 rmic
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Rmid
-rwxr-xr-x 1 root Wheel 54640 5 23:08 rmiregistry
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Schemagen
-rwxr-xr-x 1 root Wheel 54640 5 23:08 serialver
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Servertool
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Tnameserv
-rwxr-xr-x 1 root Wheel 54640 5 23:08 unpack200
-rwxr-xr-x 1 root Wheel 54624 5 23:08 Wsgen
-rwxr-xr-x 1 root Wheel 54640 5 23:08 Wsimport
-rwxr-xr-x 1 root Wheel 54624 5 23:08 XJC
This directory is familiar, the original directory is what we usually say java_home/bin/

OK, let's go back and take a look at the outside directory.
>>cd/system/library/frameworks/javavm.framework
>>ls-l
Drwxr-xr-x Root Wheel 374 5 20 23:08.
Drwxr-xr-x 118 root Wheel 4012 2 18 13:50..
Lrwxr-xr-x 1 root Wheel 5 23:08 Classes-versions/currentjdk/classes
Lrwxr-xr-x 1 root Wheel 5 23:08 Commands-Versions/currentjdk/commands
Lrwxr-xr-x 1 root Wheel 5 23:08 frameworks-Versions/current/frameworks
Lrwxr-xr-x 1 root Wheel 5 23:08 Home-Versions/currentjdk/home
Lrwxr-xr-x 1 root Wheel 5 23:08 JAVAVM-VERSIONS/CURRENT/JAVAVM
Lrwxr-xr-x 1 root Wheel 5 23:08 Libraries-versions/currentjdk/libraries
Lrwxr-xr-x 1 root Wheel 5 23:08 Resources, versions/current/resources
Drwxr-xr-x Root Wheel 374 5 23:08 Versions
-rw-r--r--1 root Wheel 104 2 13:48 Module.map
See, almost all of the soft connections are pointing to subdirectories in the directory's versions directory, so let's go into the versions directory and see what's in this directory.
>>CD versions/
>>ls-l
Drwxr-xr-x Root Wheel 374 5 20 23:08.
Drwxr-xr-x Root Wheel 374 5 20 23:08..
Lrwxr-xr-x 1 root Wheel 5 23:08 1.4-CURRENTJDK
Lrwxr-xr-x 1 root Wheel 5 23:08 1.4.2-CURRENTJDK
Lrwxr-xr-x 1 root Wheel 5 23:08 1.5-CURRENTJDK
Lrwxr-xr-x 1 root Wheel 5 23:08 1.5.0-CURRENTJDK
Lrwxr-xr-x 1 root Wheel 5 23:08 1.6-CURRENTJDK
Lrwxr-xr-x 1 root Wheel 5 23:08 1.6.0-CURRENTJDK
Drwxr-xr-x 7 Root Wheel 238 5 23:08 A
Lrwxr-xr-x 1 root wheel 1 5 23:08
Lrwxr-xr-x 1 root Wheel 5 23:08 currentjdk/system/library/java/javavirtualmachines/1.6.0.jdk/contents
See, all Java versions point to the same directory currentjdk, and CURRENTJDK points to another directory, okay, let's see what's in this directory.
>>cd/system/library/java/javavirtualmachines/1.6.0.jdk/contents
>>ls-l
Drwxr-xr-x Root Wheel 340 10 11 2013.
Drwxr-xr-x 3 Root Wheel 102 10 11 2013..
Drwxr-xr-x Root Wheel 408 5 23:08 Classes
Drwxr-xr-x Root Wheel 1394 5 23:08 Commands
Drwxr-xr-x 6 Root Wheel 204 5 23:08 Home
-rw-r--r--1 root Wheel 1961 5 23:08 Info.plist
Drwxr-xr-x root Wheel 1700 5 23:08 Libraries
Drwxr-xr-x 3 Root Wheel 102 5 23:08 MacOS
Drwxr-xr-x Root Wheel 1088 5 23:08 Resources
-rw-r--r--1 root Wheel 462 5 23:08 version.plist
See the home directory, this directory is what we usually call the Java_home.

-Second, download a jdk1.7_xx.dmg from Oracle and follow the prompts to install it.
The Java provided by Oracle is installed in the/LIBRARY/JAVA/JAVAVIRTUALMACHINES/JDK1.7.0_55.JDK directory.

--vim ~/.bash_profile, add the following code.
Java_home=/library/java/javavirtualmachines/jdk1.7.0_55.jdk/contents/home
classpaht=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar
Path= $JAVA _home/bin: $PATH:
Export Java_home
Export CLASSPATH
Export PATH

Install JDK under Mac (GO)