➜ ~ brew search openjdk
==> Formulae
openjdk openjdk@11 openjdk@8 openj9 openvdb
...
👉 openjdk@11 — Homebrew Formulae 
➜ ~ brew info openjdk@11
openjdk@11: stable 11.0.12 (bottled) [keg-only]
Development kit for the Java programming language
https://openjdk.java.net/
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/[email protected]
License: GPL-2.0-only
==> Dependencies
Build: autoconf ✔
==> Caveats
For the system Java wrappers to find this JDK, symlink it with
sudo ln -sfn /usr/local/opt/openjdk@11/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk-11.jdk
openjdk@11 is keg-only, which means it was not symlinked into /usr/local,
because this is an alternate version of another formula.
If you need to have openjdk@11 first in your PATH, run:
echo 'export PATH="/usr/local/opt/openjdk@11/bin:$PATH"' >> ~/.zshrc
For compilers to find openjdk@11 you may need to set:
export CPPFLAGS="-I/usr/local/opt/openjdk@11/include"
...
➜ ~ brew install openjdk@11
...
「keg-only」は「リンクされていない」。
➜ ~ sudo ln -sfn /usr/local/opt/openjdk@11/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk-11.jdk
➜ ~ echo 'export PATH="/usr/local/opt/openjdk@11/bin:$PATH"' >> ~/.zshrc
➜ ~ export CPPFLAGS="-I/usr/local/opt/openjdk@11/include"
➜ ~ vi .zshrc
...
#export PATH="/usr/local/opt/openjdk@11/bin:$PATH"
JAVA_8_HOME=$(/usr/libexec/java_home -v1.8)
JAVA_11_HOME=$(/usr/libexec/java_home -v11)
export JAVA_HOME=$JAVA_11_HOME
export PATH="$JAVA_HOME/bin:$PATH"
➜ ~ source ~/.zshrc
➜ ~ ls -l /Library/Java/JavaVirtualMachines
total 0
drwxr-xr-x 3 root wheel 96 11 10 2020 adoptopenjdk-8.jdk
lrwxr-xr-x 1 root wheel 45 11 30 09:43 openjdk-11.jdk -> /usr/local/opt/openjdk@11/libexec/openjdk.jdk
➜ ~ /usr/libexec/java_home -V
Matching Java Virtual Machines (2):
11.0.12 (x86_64) "Homebrew" - "OpenJDK 11.0.12" /usr/local/Cellar/openjdk@11/11.0.12/libexec/openjdk.jdk/Contents/Home
1.8.0_275 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 8" /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home
/usr/local/Cellar/openjdk@11/11.0.12/libexec/openjdk.jdk/Contents/Home
➜ ~ java -version
openjdk version "11.0.12" 2021-07-20
OpenJDK Runtime Environment Homebrew (build 11.0.12+0)
OpenJDK 64-Bit Server VM Homebrew (build 11.0.12+0, mixed mode)
➜ ~ javac -version
javac 11.0.12
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