mac设置java环境变量， 使用oh-my-zsh

~/.bash_profile

~/.profile；

## check the present running java
which java

## check java version
java -version

## check all the available jdk
/usr/libexec/java_home -V

## check the top jdk
/usr/libexec/java_home

## check some jdk (eg. version 1.7)
/usr/libexec/java_home -v 1.7

## edit .zshrc to set java_home variable
vim ~/.zshrc

## add the following line into the file
export JAVA_HOME=$(/usr/libexec/java_home)

## you can also use the following line to set the variable, which is not recommended, only for older mac os.
## export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

##let the configuration in .zshrc take effect
source ~/.zshrc

## check if configure succeed
echo $JAVA_HOME