sdkman
$ sdk install scala 2.12.1
$ sdk list groovy
$ sdk use scala 2.12.1
$ sdk default scala 2.11.6
$ sdk uninstall scala 2.11.6
$ sdk selfupdate
Zing JVM GC
Azul C4 Garbage Collector Algorithm
禅修
自己在干什么、想要什么跟不想要什么
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