https://www.cnblogs.com/c-xiaohai/p/6985018.html

dmg安裝包安裝
vim ~/.bash_profile_jdk

export JAVA_8_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk/Contents/Home

export JAVA_11_HOME=/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home

#alias是設定指令的別名：動態切換JAVA_HOME的配置
alias jdk8="export JAVA_HOME=$JAVA_8_HOME"
alias jdk11="export JAVA_HOME=$JAVA_11_HOME"
 

source ~/.bash_profile_jdk

切換：

jdk8
java -version