是否可以从PriorityQueue中删除元素？

是否可以从PriorityQueue中删除元素？

文件:
http://www.scala-lang.org/api/current/index.html#scala.collection.mutable.PriorityQueue
http://www.scala-lang.org/api/current/index.html#scala .collection.Iterator

我有一个PQ w各种双值(一些重复) - 我用它作为一个堆来跟踪流媒体环境中的滚动中位数.我想从PQ中删除值,但无法弄清楚如何.
我试图使用迭代器来找到PQ的一个元素并放在那里,但它没有用.我想知道它是否可能？

val maxHeapLeft= new mutable.PriorityQueue[Double]()(Ordering[Double])
maxHeapLeft.enqueue(5)
maxHeapLeft.enqueue(55)
maxHeapLeft.enqueue(25)
maxHeapLeft.enqueue(15)
maxHeapLeft.enqueue(15)
val it= maxHeapLeft.iterator
var p1=it.next
p1=it.next

println("size before " +maxHeapLeft.size)
it.drop(1)
println("size AFTER " +maxHeapLeft.size)

PQ的大小不会改变.

编辑1:到目前为止,我用来maxHeapLeft= new mutable.PriorityQueue[Double]()(Ordering[Double]) ++ (maxHeapLeft.toList diff List(15))从PQ中删除15.当然,太可怕了.

编辑2:自定义优先级队列失败的测试用例(对于@Nate):

 "PQ" should "produce correct values " in {
    val testOperations = List[String]("8114.0", "9233.0", "dequeue", "10176.0", "10136.0", "dequeue", "10041.0", "9900.0", "10787.0", "10476.0", "10439.0", "dequeue", "10722.0", "9900.0", "11028.0", "10764.0", "dequeue", "10698.0", "10374.0", "dequeue", "-10176.0", "10198.0", "-10136.0", "11478.0", "10930.0", "dequeue", "10881.0", "dequeue", "10555.0", "dequeue", "-10787.0", "10439.0", "-10476.0", "11596.0", "-10439.0", "10757.0", "-10722.0", "10493.0", "10551.0", "dequeue", "-11028.0", "10493.0", "-10764.0", "11892.0", "-10698.0", "11276.0", "10917.0", "dequeue", "15855.0", "dequeue", "12008.0", "dequeue")
    val customPQ= new PriorityQueue[Double]()(Ordering[Double].reverse) //cread min heap

    for (el <-testOperations){
      el match {
        case dequeue if el=="dequeue" => customPQ.dequeue()
        case remove if remove.toDouble < 0 => customPQ -= (-1*remove.toDouble )
        case add => customPQ.enqueue(add.toDouble )
      }
    }

    println(customPQ.head + "==" + customPQ.min)
    println(customPQ)
  }

测试输出:
10881.0 == 10757.0
PriorityQueue(10881.0,10917.0,11596.0,10930.0,11276.0,11892.0,12008.0,11478.0,10757.0,15855.0)