Mac 切换Java版本

export JAVA_HOME_8=/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home
export JAVA_HOME_10=/Library/Java/JavaVirtualMachines/jdk-10.0.2.jdk/Contents/Home
export JAVA_HOME=$JAVA_HOME_8

#终端中通过alias切换
alias jdk8='export JAVA_HOME=$JAVA_HOME_8'
alias jdk10='export JAVA_HOME=$JAVA_HOME_10'

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