Deque的使用

/*** Retrieves and removes the first element of this deque,* or returns {@code null} if this deque is empty.** @return the head of this deque, or {@code null} if this deque is empty*/E pollFirst();/*** Retrieves and removes the last element of this deque,* or returns {@code null} if this deque is empty.** @return the tail of this deque, or {@code null} if this deque is empty*/E pollLast();/*** Retrieves, but does not remove, the first element of this deque.** This method differs from {@link #peekFirst peekFirst} only in that it* throws an exception if this deque is empty.** @return the head of this deque* @throws NoSuchElementException if this deque is empty*/E getFirst();/*** Retrieves, but does not remove, the last element of this deque.* This method differs from {@link #peekLast peekLast} only in that it* throws an exception if this deque is empty.** @return the tail of this deque* @throws NoSuchElementException if this deque is empty*/E getLast();

priotityQueue

remove 是删除最后一个 clear 删除所有的public void clear() {modCount++;for (int i = 0; i < size; i++)queue[i] = null;size = 0;}

总结

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