The PriorityQueue class essentially maintains an ordered list.
priorityqueue类实质上维护了一个有序列表。
Because LinkedList isn't new, let's look at the new PriorityQueue class.
因为LinkedList不是新事物，所以我们来看一下新的priorityqueue类。
In this article, I'll look at three other changes: the updated Arrays and Collections classes and the new Queue interface, with its PriorityQueue implementation.
在本文中，我将研究其他三个变化：更新过的Arrays和collections类、新的Queue接口以及它的PriorityQueue实现。
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