苹果电脑 ( MacOS) brew 安装 Java
也是够无语的了，brew 安装 Java 用 brew install java 是不可能实现的
brew install java Updating Homebrew... Error: No available formula with the name "java" ==> Searching for a previously deleted formula (in the last month)... Error: No previously deleted formula found. ==> Searching for similarly named formulae... These similarly named formulae were found: app-engine-java google-java-format javarepl jslint4java libreadline-java To install one of them, run (for example): brew install app-engine-java ==> Searching taps... ==> Searching taps on GitHub... These formulae were found in taps: homebrew/linuxbrew-core/app-engine-java homebrew/linuxbrew-core/libreadline-java homebrew/linuxbrew-core/google-java-format To install one of them, run (for example): brew install homebrew/linuxbrew-core/app-engine-java
安装 Java 必须使用 brew cask java，这个安装的是最新版本的，也就是 Java 11
java -version openjdk version "11.0.2" 2018-10-16 OpenJDK Runtime Environment 18.9 (build 11.0.2+7) OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+7, mixed mode)
如果要安装旧版的，也不能使用下面的命令
brew cask install java8
必须 tap 以下才能安装，比如
brew tap caskroom/versions
然后你就可以使用下面的方式轻松的安装各个老版本了
brew cask install java8 brew cask install java6
那么，7, 9 和 10 怎么办呢？ 我就不知道了，你知道了告诉我把
下面这样是行不通的
brew cask install java10 brew cask install java7 brew cask install java9
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