Difference Between Linkedlist And Arraylist In Java
differences between LinkedList and ArrayList in Java
Difference Between Linkedlist And Arraylist In Java
In Java, ArrayList and LinkedList are two commonly used collection classes that implement the List interface. ArrayList is implemented as a resizable array, which means elements can be efficiently accessed by index and added or removed at the end of the list with O(1) time complexity. On the other hand, LinkedList is implemented as a doubly linked list, where elements are connected through nodes with references to the previous and next elements. This allows for efficient insertion and deletion at any position in the list with O(1) time complexity, but accessing elements by index requires traversing the list and has a time complexity of O(n). Therefore, ArrayList is preferred when random access and iteration are common operations, while LinkedList is suitable for scenarios where frequent insertion and deletion operations are required.
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1 - Linked list and ArrayList are both classes in Java that implement the List interface, but they have key differences in terms of how they store and access elements.
2) ArrayList is implemented as a resizable array, meaning elements are stored in a contiguous block of memory that can grow or shrink dynamically.
3) On the other hand, linked list is implemented using a sequence of nodes, where each node contains the element at that position as well as a reference to the next node in the sequence.
4) Adding or removing elements in an ArrayList at the beginning or middle of the list can be slower compared to a linked list because of the shifting of elements required.
5) In contrast, adding or removing elements at any position in a linked list is generally faster as it only involves changing references between nodes.
6) Random access of elements in an ArrayList using get(int index) is faster compared to a linked list because elements are stored in contiguous memory locations.
7) Linked lists are more memory efficient for storing elements because they only require memory for the value of each element and a small overhead for the reference to the next node.
8) ArrayLists can be more efficient when accessing elements sequentially due to better cache locality, meaning subsequent elements are likely to be in the cache.
9) Linked list operations like get(int index) or set(int index, E element) have a time complexity of O(n) as they may need to traverse the list from the beginning or end to reach the desired position.
10) In contrast, ArrayList operations like get(int index) or set(int index, E element) have a time complexity of O(1) for random access, as the element can be directly accessed using its index.
11) When choosing between ArrayList and LinkedList, it's important to consider the specific requirements of the program, such as the frequency of adding/removing elements versus accessing elements, as well as the size of the data set.
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