Mac OS X Switching Java Version on Shell
The Unix Tutorial Show Step-by-Step How-to Easy Switching on Terminal Bash Shell a Java Multi-Version Installation for Mac OS X 10.11 El Capitan Unix/BSD.
The Tutorial Include also Links on How-to Download and Install the Oracle Official Java Development Kit 7/8 for Mac OS X.

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Open a Command Line Terminal Window
(Press “Enter” to Execute Commands) -
Edit the Bash Shell Config Environment
nano $HOME/.bashrc
Copy & Paste inside this is Function:
alias java_ls='/usr/libexec/java_home -V 2>&1 | grep -E "\d.\d.\d[,_]" | cut -d , -f 1 | colrm 1 4 | grep -v Home' function java_use() { export JAVA_HOME=$(/usr/libexec/java_home -v $1) export PATH=$JAVA_HOME/bin:$PATH java -version }
Ctrl+x to Save & Exit from nano Editor 😉
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Load the New Environment
bash
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Then to Easy Switch the Java Version
java_use 1.[x]
Example:
java_use 1.6
How-to Install the Oracle Java JDK 7+ on Mac OS X: