官网下载

• 下载地址
  https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

jenv

https://github.com/jenv/jenv
mac 上的java版本管理，类似swiftenv.

• 安装:brew install jenv
• 配置:

# git clone https://github.com/jenv/jenv.git ~/.jenv
# Shell: bash
echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(jenv init -)"' >> ~/.bash_profile
# Shell: zsh
echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.zshrc
echo 'eval "$(jenv init -)"' >> ~/.zshrc

• 查看是否安装成功：jenv
• 诊断配置：jenv doctor
• 添加java已安装的版本管理:jenv add /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk版本/Contents/Home/