scala高阶函数之option
摘要:
option是scala中是否有值函数 package day3 object demo_option { def main(args: Array[String]): Unit = { val contrymap = Map[String, String]( "china" -> "beijing 阅读全文
posted @ 2021-08-31 15:26 孔扎根 阅读(93) 评论(0) 推荐(0) 编辑