Scala 学习笔记之集合(6)

object CollectionDemo7 {
   def main(args: Array[String]): Unit = {
     //数组使用
     val arr = Array("red", "blue", "yellow")
     arr(0) = "white"
     for(el <- arr){println(el)}
     //用Seq构建List
     println(Seq("red", "blue", "yellow"))
     //用IndexedSeq构建Vector
     println(IndexedSeq("red", "blue", "yellow"))
     //构建Stream lazy集合
     def inc(i: Int): Stream[Int] = Stream.cons(i, inc(i+1))
     val s = inc(1)
     println(s)
     println(s.take(10).toList)
     println(s)
     
     def addHead(i: Int): Stream[Int] = i #:: addHead(i+1)
     val ss = addHead(1)
     println(ss)
     println(ss.take(10).toList)
     println(ss)
     
   }
}