Mac 上安装和卸载Java JDK

sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -fr /Library/PreferencesPanes/JavaControlPanel.prefpane
sudo rm -fr ~/Library/Application\ Support/Java

#查找当前版本
#输入：
ls /Library/Java/JavaVirtualMachines/
#输出：jdk-9.0.1.jdk
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk

brew tap caskroom/versions
brew cask install java8   # 安装java8
#brew cask install java  #默认安装最新版本

# 1.定位JAVA_HOME位置
/usr/libexec/java_home

# 2.编辑profile文件
vim ~/.bash_profile

# 3.格式参考

JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

# 4.执行生效
source ~/.bash_profile

# 5.检查是否成功
echo $JAVA_HOME