Windows安装
https://www.coursera.org/learn/progfun1/lecture/8LrWd/tools-setup-for-windows
基础配置(安装,IDE,SBT)
https://www.coursera.org/learn/progfun1/home/week/1
cmd
scalac- name.scala-->scala name.scala
object hello_test2 extends App { println("Hello world") }