package test_28object Test {def main(args: Array[String]): Unit = {val list1 = List(1,2,3,4,5)//任务： 输出每一个元素//list1.foreach(println)//任务： 跳过前两个，从第3个开始输出//迭代器//1. 创建一个迭代器（iterator）val it1 = list1.iteratorval in2 = it1.drop(2)//2.依次访问每个元素while (it1.hasNext){println(in2.next())}println(in2.hasNext)val list2 = List(1,2,3)val it3 = list2.iteratorit3.next()it3.next()it3.next()it3.next()}
}
结果是：
3
4
5
false
Exception in thread "main" java.util.NoSuchElementException: head of empty list
at scala.collection.immutable.Nil$.head(List.scala:663)
at scala.collection.immutable.Nil$.head(List.scala:662)
at scala.collection.StrictOptimizedLinearSeqOps$$anon$1.next(LinearSeq.scala:267)
at test_28.Test$.main(Test.scala:27)
at test_28.Test.main(Test.scala)
进程已结束,退出代码1
