1、直接安装
dmp包直接安装两个版本的jdk，比如我这里安装的1.8.0_181 、10.0.2。
2、配置环境
打开环境变量配置文件bash_profile
$ vim ~/.bash_profile
# java
export JAVA_8_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home"
export JAVA_10_HOME="/Library/Java/JavaVirtualMachines/jdk-10.0.2.jdk/Contents/Home"
alias jdk8="export JAVA_HOME=$JAVA_8_HOME"
alias jdk10="export JAVA_HOME=$JAVA_10_HOME"
export JAVA_HOME=$JAVA_8_HOME
export PATH="$JAVA_HOME:$PATH"
$ source ~/.bash_profile
3、任意切换java环境
控制台输入jdk8或者jdk10就会自动切换
JeandeMBP:~ healerjean$ jdk8
JeandeMBP:~ healerjean$ java -version
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13) Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
JeandeMBP:~ healerjean$ jdk10
JeandeMBP:~ healerjean$ java -version java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)
4、删除jdk
$ sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
$ sudo rm -fr /Library/PreferencesPanes/JavaControlPanel.prefpane
查找当前版本
$ ls /Library/Java/JavaVirtualMachines/
输出：jdk1.8.0_181.jdk
删除
$ sudo rm -rf /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk
