如何按排序顺序将优先级转换为列表？
如何将PriortityQueue转换为list在不更改（poll（）等）的情况下 priortityqueue ？我们要同时保留PriorityQueue和list。
将2、3、1添加到PriorityQueue将其排序为1、2、3。 2，3，1。 1。我想这与PriorityQueue的实现有关。
How do you convert a PriorityQueue to a List in the sorted order without altering (poll(), etc) the PriorityQueue? We want to keep both the PriorityQueue and the List.
Adding 2, 3, 1 to a PriorityQueue will sort it to 1, 2, 3. Creating an ArrayList from the PriorityQueue will have an order of 2, 3, 1. The iterator() and toArray() methods from the PriorityQueue will also have an order of 2, 3, 1. I guess it has to do with the implementation of PriorityQueue.
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如
PriorityQueue中的Javadoc中所述：必须这样做似乎是一个奇怪的情况。您可能需要查看用例，并确保使用最佳解决方案。例如，您可以使用
treeset而不是list。或者，您可能首先需要重新考虑您要使用队列的工作。但是要回答您的问题，一种非常简单的（但可能不高效？）将
PriortityQueue的优先元素复制到list> list的方法是：As noted in the JavaDoc for
PriorityQueue:It seems like an odd scenario to have to do this. You may want to review your use case and ensure you're using the best solution. You could use a
TreeSetinstead instead of aList, for example. Or you might need to rethink what you're trying to do with your queue in the first place.But to answer your question, a pretty straightforward (but maybe not efficient?) way to copy a
PriorityQueue's prioritized elements into aListwould be: