彩虹的约定

object Array_opt { def main(args: Array[String]) { // init an array val array = new Array[String](3) val arr = Array(1, 2, 3, 4) // traversal element // method 1 for (i 0

object list_opt { def main(args: Array[String]) { // init list val list1 = List("a", "b", "c") val list2 = List(1, 2, 3) val list3 = "a" :: "b" :: "c" :: Nil // last element is Nil

object operate_match { def main(args: Array[String]) { // map match val map = Map("scala" -> "spark", "java" -> "hadoop") map match { case m: Map[_, _] => println("--------------

object word_count { def main(args: Array[String]) { /* scala版wordCount */ val arr = Array(2, 3, 5, 4, 5, 2, 4, 3, 5, 2, 4, 4, 2) val map = wordCount(arr) for ((k, v) map) {