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Queue 中 remove() 和 poll()有什么区别？
Queue 中 remove() 和 poll()都是用来从队列头部删除一个元素。
在队列元素为空的情况下，remove() 方法会抛出NoSuchElementException异常，poll() 方法只会返回 false 。
JDK1.8
/**
* Retrieves and removes the head of this queue. This method differs
* from {@link #poll poll} only in that it throws an exception if this
* queue is empty.
*
* @return the head of this queue
* @throws NoSuchElementException if this queue is empty
*/
E remove();
/**
* Retrieves and removes the head of this queue,
* or returns {@code null} if this queue is empty.
*
* @return the head of this queue, or {@code null} if this queue is empty
*/
E poll();