大家都搜：
优先事项
1、PriorityBlockingQueue: An unbounded priority queue backed by a priority heap───PriorityBlockingQueue：一个由优先级堆支持的无界优先级队列。
2、PriorityBlockingQueue is a queue with an unbound capacity that maintains elements in their logical order through use of the Comparable sort order of the contained elements.───PriorityBlockingQueue是具有无界限容量的队列，它利用所包含元素的Comparable排序顺序来以逻辑顺序维护元素。