Linux/Alternatives

Configure

sudo update-alternatives --config java

There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                      Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      auto mode
  1            /usr/bin/gij-4.4                           1044      manual mode
  2            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      manual mode
  3            /usr/lib/jvm/java-6-sun/jre/bin/java       63        manual mode

Press enter to keep the current choice[*], or type selection number:

reference: https://stackoverflow.com/questions/12787757/how-to-use-the-command-update-alternatives-config-java

Install

--install <link> <name> <path> <priority>

sudo update-alternatives --install /tmp/randomStuff java /usr/local/java/jre1.7.0_25/bin/java 0

reference: https://unix.stackexchange.com/questions/81992/better-way-to-add-alternative-using-update-alternatives