1 object Test16_CommonWordCount {
2 def main(args: Array[String]): Unit = {
3 val list = List(
4 "hello",
5 "hello world",
6 "hello scala",
7 "hello world",
8 "hello scala",
9 "hello java"
10 )
11 //1、对字符串进行切分，得到一个打散所有单词的列表
12 val wordlist = list.flatMap(_.split(","))
13 println(wordlist)
14
15 //2、相同的单词进行分组
16 val grouplist = wordlist.groupBy( word => word )
17 println(grouplist)
18
19 //3、对分组之后的list取长度，得到每个单词的个数
20 val countMap = grouplist.map(kv => (kv._1, kv._2.length))
21
22 //4、将map转换为list，排序取出前3
23 val sortlist = countMap.toList
24 .sortWith( _._2 > _._2 )
25 .take(3).foreach(println)
26 }
27 }
