1 import scala.collection.immutable.Queue
2 import scala.collection.mutable
3
4 object Test18_Queue {
5 def main(args: Array[String]): Unit = {
6 //创建一个可变队列
7 val queue = new mutable.Queue[String]()
8 queue.enqueue("a", "b", "c")
9 //入队
10 println(queue)
11 //出队，先进先出
12 println(queue.dequeue())
13 println(queue)
14 println(queue.dequeue())
15 println(queue)
16
17 queue.enqueue("d", "e")
18 println(queue.dequeue())
19
20 //不可变队列
21 val queue1 = Queue("a", "b", "c")
22 val queue2 = queue1.enqueue("d")
23 println(queue1)
24 println(queue2)
25 }
26 }
