PriorityQueue

复杂度：

 

 

基于堆实现优先队列：

 

package com.lt.datastructure.MaxHeap;

import com.lt.datastructure.Queue.Queue;

/**
 * 堆实现优先队列
 */
public class PriorityQueue<E extends Comparable<E>> implements Queue<E> {
   
    private MaxHeap<E> maxHeap;

    public PriorityQueue() {
        maxHeap = new MaxHeap<>();
    }
    
    @Override
    public int getSize() {
        return maxHeap.size();
    }
    
    @Override
    public boolean isEmpty() {
        return maxHeap.isEmpty();
    }
    
    @Override
    public E getFront(E e) {
        //查找队首元素
        return maxHeap.findMax();
    }
    
    @Override
    public void enqueue(E e) {
        maxHeap.add(e);
    }
    
    @Override
    public E dequeue() {
        //最大值先出队
        return maxHeap.extractMax();
    }
}