开发库如 Gradle 和 Java11 之间存在兼容问题需用旧版本 Java，但安装旧版本无法用以下命令获取
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brew install java8
Homebrew 会找不到该库而报错
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Error: No available formula with the name "java8"
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
==> Searching taps on GitHub...
Error: No formulae found in taps.
得先获取 cask-versions
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brew tap homebrew/cask-versions
从 cask-versions 安装 JDK8
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brew cask install homebrew/cask-versions/adoptopenjdk8