1.下载jdk并安装

jdk 

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vim ~/.bash_profile

添加
export JAVA_7_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home
export JAVA_8_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_211.jdk/Contents/Home
export JAVA_HOME=$JAVA_8_HOME
alias jdk7="export JAVA_HOME=$JAVA_7_HOME"
alias jdk8="export JAVA_HOME=$JAVA_8_HOME"
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/ 

source ~/.bash_profile
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jdk8
source ~/.bash_profile
java -version
echo $JAVA_HOME
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brew install jenv
echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(jenv init -)"' >> ~/.bash_profile
jenv versions
jenv add /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home/
jenv versions
jenv remove 1.6
jenv local 1.8.0.25
java -version
jenv which java 完整路径

Mac上使用Jenv管理多个JDK版本.