change jre version code example

Example 1: change java version

/usr/libexec/java_home -V  
export JAVA_HOME=`/usr/libexec/java_home -v 1.6.0_65-b14-462` //java 8

Example 2: changer version java terminal

export JAVA_HOME=`/usr/libexec/java_home -v 1.8`