Java & Path Variables in Mac OS

To know where Java is installed,

In terminal type the below

/usr/libexec/java_home -v 1.7   [or]

sudo find / -name java

To set any new path to the existing classpath in Mac,

Go to the .profile or .bash_profile found under Documents folder for each user and for example adding android path, type the below lines,

export PATH=${PATH}:<your-android-sdk-path>/platform-tools/
export PATH=${PATH}:<your-android-sdk-path>/tools

Save it. Close the file.

In terminal, type the below
echo $PATH
to confirm whether the path is listed there in environment variable.

Now close and restart the terminal and type the corresponding commands to check if it is working.

Reference:
http://stackoverflow.com/questions/5526470/trying-to-add-adb-to-path-variable-osx
http://stackoverflow.com/questions/15826202/where-is-java-7-installed-on-mac-os-x