MAC安装JDK8

安装

下载java8安装包

前往Oracle官网下载java8版本安装包

当前演示版本为 jdk-8u291-macosx-x64.dmg

安装java8

安装完成后查看版本信息

➜  Downloads java -version
java version "1.8.0_291"
Java(TM) SE Runtime Environment (build 1.8.0_291-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.291-b10, mixed mode)

配置环境变量

定位JAVA_HOME位置

➜  ~ /usr/libexec/java_home -V
Matching Java Virtual Machines (2):
    1.8.291.10 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
    1.8.0_291 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_291.jdk/Contents/Home
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

配置JAVA_HOME环境变量, 编辑~/.bash_profile,添加

# java 
export JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_291.jdk/Contents/Home"
export CLASS_PATH="$JAVA_HOME/lib"
# 方式一
export PATH=".;$PATH:$JAVA_HOME/bin"
# 方式二
export PATH=:$JAVA_HOME/bin:$PATH

验证环境变量

export 
export $PATH

使配置生效

source ~/.zshrc

验证环境变量配置是否成功

$ echo $JAVA_HOME        
/Library/Java/JavaVirtualMachines/jdk1.8.0_291.jdk/Contents/Home

参考：
macOS安装java8及环境变量配置