Java的LinkedList中的链表peek和元素

Question

peek和Java的LinkedList中的元素有什么区别

以下是OracleJava文档页面对它们的描述，但它们没有解释区别

public E peek()
Retrieves, but does not remove, the head (first element) of this list.
Specified by: peek in interface Deque<E>
Specified by: peek in interface Queue<E>
Returns: the head of this list, or null if this list is empty
Since: 1.5

public E element()
Retrieves, but does not remove, the head (first element) of this list. Specified by: element in interface Deque<E>
Specified by: element in interface Queue<E>
Returns: the head of this list
Throws: NoSuchElementException - if this list is empty
Since: 1.5

如果我们的列表是空的，那么一个抛出异常，另一个返回null，这就是区别吗

Answer 1

查看the documentation of ^{}，我们发现下表：

Summary of Queue methods

	Throws Exception	Returns special value
Insert	add(e)	offer(e)
Remove	remove()	poll()
Examine	element()	peek()

正如我们所看到的，不同之处在于^{}可以抛出^{}，而^{}不抛出