To set to JDK 6
export JAVA_HOME=$(/usr/libexec/java_home -v 1.6)
To set JDK 7
export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)
To set JDK 8
export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
alias setjdk16='export JAVA_HOME=$(/usr/libexec/java_home -v 1.6)'
alias setjdk17='export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)'
alias setjdk18='export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)'
参考资料
[1]. https://coderwall.com/p/esa4sg