Scala实现wordCount

package day02

/**
  * Scala实现WordCount
  */
object ScalaWordCount {
  def main(args: Array[String]): Unit = {

    val lines = List("hello java hello python","hello scala","hello scala hello java hello scala")

    // 切分并压平
    val words = lines.flatMap(_.split(" "))

    // 把每个单词生成一个一个的pair
    val tuples = words.map((_,1))

    // 以key(单词)进行分组
    val grouped = tuples.groupBy(_._1)

    // 统计value长度
    val sumed = grouped.mapValues(_.size)

    // 排序
    val sorted = sumed.toList.sortBy(_._2)

    // 降序排列
    val result = sorted.reverse

    println(result)

  }
}