Collection Java Book

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  4. 0281 Peek the element
E element()
Retrieves, but does not remove, the head (first element) of this list.
E peek()
Retrieves, but does not remove, the head (first element) of this list.
E peekFirst()
Retrieves, but does not remove, the first element of this list, or returns null if this list is empty.
E peekLast()
Retrieves, but does not remove, the last element of this list, or returns null if this list is empty.