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java优先队列 PriorityQueue

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PriorityQueue是个基于优先级堆的极大优先级队列。 此队列按照在构造时所指定的顺序对元素排序,既可以根据元素的自然顺序来指定排序(参阅 Comparable), 也可以根据 Comparator 来指定,这取决于使用哪种构造方法。优先级队列不允许 null 元素。 依靠自然排序的优先级队列还不允许插入不可比较的对象(这样做可能导致 ClassCastException) 比如队列 1 3 5 10 2 自动会被排列 1 2 3 5 10 package com.javaer.examples.datastruct;   import java.util.Comparator; import java.util.PriorityQueue; import java.util.Queue;   import org.apache.poi.ss.formula.functions.Count;   public class PriorityQueueExample {   … 继续阅读

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