노트북 교체 신청을 위해 OS를 밀었다..
무어라도 기록하자..
https://blog.naver.com/manyong3774/221667076048
JDK 설치 확인 (아래 JAVA)
/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home
vi ~/.bash_profile
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home
export PATH=JAVA_HOME/bin
source ~/.bash_profile
echo $PATH
javac -version
java -version