命令行查看java,javac版本号

(base) ➜  ~ java -version 
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)
(base) ➜  ~ javac -version
javac 1.8.0_211