Returning null + removing operations: poll(), pollFirst().
Returning null + not removing operations: peek(), peekFirst().
Throwing exception + removing operations: pop(), remove(), removeFirst().
Throwing exception + not removing operations: element(), getFirst().
reference： http://stackoverflow.com/questions/14851367/java-linkedlist-differences-between-retrieve-operations
转载于:https://www.cnblogs.com/hygeia/p/5087617.html
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