更新时间:2023-12-04 20:57:46
两者都具有相同的时间复杂度-O(n),但是恕我直言,LinkedList
版本会更快,尤其是在大型列表中,因为删除时数组(ArrayList
)中的一个元素,右侧的所有元素都必须向左移动-以便填充空的数组元素,而LinkedList
只需重新布线4个引用
Both will have the same time complexity - O(n), but IMHO, the LinkedList
version will be faster especially in large lists, because when you remove an element from array (ArrayList
), all elements on the right will have to shift left - in order to fill in the emptied array element, while the LinkedList
will only have to rewire 4 references
以下是其他列表方法的时间复杂度:
Here are the time complexities of the other list methods:
For LinkedList<E>
get(int index) - O(n)
add(E element) - O(1)
add(int index, E element) - O(n)
remove(int index) - O(n)
Iterator.remove() is O(1)
ListIterator.add(E element) - O(1)
For ArrayList<E>
get(int index) is O(1)
add(E element) is O(1) amortized, but O(n) worst-case since the array must be resized and copied
add(int index, E element) is O(n - index) amortized, O(n) worst-case
remove(int index) - O(n - index) (removing last is O(1))
Iterator.remove() - O(n - index)
ListIterator.add(E element) - O(n - index)