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如何在 Mac 上卸载/安装 Java ？

卸载

参考文章 https://www.java.com/zh_CN/download/help/mac_uninstall_java.xml

查询当前java安装版本

AppledeMacBook-Pro-JingjingMa:~ apple$ ls /Library/Java/JavaVirtualMachines/
jdk-11.0.4.jdk

卸载

sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin 
sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefPane 
sudo rm -fr ~/Library/Application\ Support/Oracle/Java  
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk-11.0.4.jdk

安装

下载安装包
https://download.oracle.com/otn/java/jdk/8u221-b11/230deb18db3e4014bb8e3e8324f81b43/jdk-8u221-macosx-x64.dmg
双击安装
查看安装版本

AppledeMacBook-Pro-JingjingMa:~ apple$ ls /Library/Java/JavaVirtualMachines/
jdk-11.0.4.jdk

配置环境变量

vim .bash_profile 添加内容

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin

使配置生效

source .bash_profile