Scala入门方法使用小案例(单词统计次数)

最新推荐文章于 2021-11-11 14:22:13 发布

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最新推荐文章于 2021-11-11 14:22:13 发布 · 724 阅读

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首先创建一个数组,其中存储三个字符串

    val words: Array[String] = Array("Spark,hadoop,Flink,spark","spark,Hadoop,flink,Hive,clickHouse","flink,hive,clickHouse,spark,zooKerPer,hive")

将字符串切割开,并将内部的小数组打开

    val wordsArray: Array[String] = words.flatMap(l =>l.split(","))

wordsArray: Array[String] = Array(Spark, hadoop, Flink, spark, spark, Hadoop, flink, Hive, clickHouse, flink, hive, clickHouse, spark, zooKerPer, hive)

按单词分组,并将大写转小写

    val wordGb: Map[String, Array[String]] = wordsArray.groupBy(a=>a.toLowerCase)

wordGb: Map[String,Array[String]] = Map(zookerper -> Array(zooKerPer), flink -> Array(Flink, flink, flink), hadoop -> Array(hadoop, Hadoop), spark -> Array(Spark, spark, spark, spark), hive -> Array(Hive, hive, hive), clickhouse -> Array