摘要：*集合* 可变集合（collection.mutable）* ListBuffer=>内容和长度都可以改变** 不可变集合(collection.immutable)* List=>长度和内容都不可变* var list=List(1,2,3,4)** Map* Map[String,String] 阅读全文

摘要：val words:Array[String]=Array("hello tom hello jim","hello hatno hello 菲菲")words.map(x=>x.split(" ")) .flatten .groupBy(x=>x) .map(wdKV=>(wdKV._1,wdKV 阅读全文