版权声明：没经同意不得转载 https://blog.csdn.net/weixin_41622043/article/details/79837397
1.http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
下载（162为子版本，下载时可选最新）
| macOS | 247.12 MB | jdk-8u162-macosx-x64.dmg |
2.下载完成后点击安装
3.打开终端
输入 cd /Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home
输入 sudo vi .bash_profile 按i 进入编辑模式，拷贝以下段落
JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
PATH=$JAVA_HOME/bin:$PATH:
export JAVA_HOME
export CALSSPATH
export PATH
按esc 输入:wq
4.输入 source .bash_profile 配置完毕