Scala综合练习_基于以下List集合实现词频统计

val list = List("hadoop spark hive ",""," hue spark hadoop hadoop","hue hive hive hive","spark hadoop hadoop")

hadoop-5
hive-4
spark-3
hue-2

val list = List("hadoop spark hive ",""," hue spark hadoop hadoop","hue hive hive hive","spark hadoop hadoop")
//    var m = Map[String, Int]()
//    readLine.trim.split(" ").foreach(i => if (m.contains(i)) m += (i -> (m(i) + 1)) else m += (i -> 1))
//    val sorted = m.toSeq.sortWith(_._2 > _._2)
//    sorted.foreach(println)
val unit = list.flatMap(x =>x.split(" ") //1.转化为List扁平化   1.切割
  .filter(x =>x.trim.length!=0))    //2.过滤空字符及前后空格     2.分组 
  .groupBy(x => x)            //3.一个个分组       3.排序
  .mapValues(_.size)          //4.取map的值
  .toList                 //5.转换成List
  .sortBy(-_._2)            //6.按次数排序 降序
  .foreach(x => println(x))         //7.循环输出
  println(unit.toString())```