前言

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

输入 
sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin 
sudo rm -fr /Library/PreferencesPanes/JavaControlPanel.prefpane


查找当前版本 
输入：ls /Library/Java/JavaVirtualMachines/ 
输出：jdk1.8.0_181.jdk

sudo rm -rf /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk