Difference between LinkedList vs ArrayList in Java

source-url

LinkedList implements it with a doubly-linked list. ArrayList implements it with a dynamically resizing array. This will lead further differences in performance.

Difference between LinkedList vs ArrayList in Java
By Lokesh Gupta | Filed Under: Java ArrayList

ArrayList and LinkedList, both implements java.util.List interface and provide capability to store and get objects as in ordered collections using simple API methods. Both are non synchronized classes. Still they are different in many aspects and we need to understand both classes in detail to make a wise decision when to use which class.

1. LinkedList vs ArrayList – Internal implementation
Both collections allow duplicate elements and maintain the insertion order of the elements.

LinkedList implements it with a doubly-linked list. ArrayList implements it with a dynamically resizing array. This will lead further differences in performance.

2. LinkedList vs ArrayList – Performance
2.1. Add operation
Adding element in ArrayList is O(1) operation if it doesn’t require resize of Array. If array is resized then it becomes O(log(n)).

Appending an element in LinkedList is O(1) operation, as it doesn’t require any navigation.

2.2. Remove operation
When we remove an element from ArrayList (in backing array), it moves all elements on right. It makes it close to O(n) in worst case (remove first element) and O(1) in best case (remove last element).

LinkedList remove operation gives O(1) performance because it just need to reset the pointers of previous and next nodes. No copy or movement is required.

2.3. Iteration
Iteration is the O(n) operation for both LinkedList and ArrayList where n is a number of an element.

2.4. Get operation
ArrayList provides get(int index) method which directly find the element at given index location. It is of order O(1).

LinkedList also provide get(int index) method BUT it first traverses all nodes to reach the correct node. It makes the performance variable. In best case it is O(1) and in worst case it is O(n).

3. LinkedList vs ArrayList – Conclusion
Until you are not dealing with very high volume of data, both the classes will give you same level of performance. Both provide ordered collection and both are non-synchronized as well.

LinkedList implements Deque interface as well, so it provides queue like FIFO functionality through methods such as peek() and poll().

As seen in performance comparison, ArrayList is better for storing and accessing data. LinkedList is better for manipulating data.

That’s all for arraylist vs linkedlist in java.

Happy Learning !!

原文地址:https://www.cnblogs.com/suanec/p/11051928.html

时间: 2024-11-10 10:22:11

Difference between LinkedList vs ArrayList in Java的相关文章

JAVA LinkedList和ArrayList的使用及性能分析

第1部分 List概括List的框架图List 是一个接口,它继承于Collection的接口.它代表着有序的队列.AbstractList 是一个抽象类,它继承于AbstractCollection.AbstractList实现List接口中除size().get(int location)之外的函数.AbstractSequentialList 是一个抽象类,它继承于AbstractList.AbstractSequentialList 实现了“链表中,根据index索引值操作链表的全部函数

JAVA学习第三十五课(常用对象API)- 集合框架(三)—Vector、LinkedList、ArrayList集合演示

集合框架构成图 摘自百度图片 一.Vector集合 演示 虽然Vector已经不常用了,但是还是要了解一下其中的方法 import java.util.ArrayList; import java.util.Enumeration; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import java.util.ListIterator; import java.util.Vector

Java中LinkedList和ArrayList的区别

首先亮一下他们两个基本区别,面试的时候可以用来和面试官唠嗑啊 1.ArrayList实现了基本动态数组结构,Linked基于链表的结构.链表?什么是链表?答:"链表是一种物理存储单元上非连续.非顺序的存储结构,数据元素的逻辑顺序是通过链表中指针连接次序实现的"注:此句话通过了科普中国百科科学词条编写与应用工作项目的审核. 2.对于get和set,ArrayList的性能优于LinkedList,因为Linked要移动指针,麻烦的很 3.对于add和remove,LinkedList要优

多线程对比linkedList和arrayList的add方法

上上一篇对linkedList和arrayList的源码对比:http://blog.csdn.net/aaashen/article/details/44925181 上一篇对linkedList和arrayList的各种方法进行单线程的对比:http://blog.csdn.net/aaashen/article/details/45011365 本篇用多线程对比,之对比add方法,插10000000条数据. 其中arrayList add 数据花费11615,linkedlist add数

Linkedlist与ArrayList的各种操作性能对比-单线程对比

为了增加说服力,每一种操作都可以设置重复次数,重复次数越大,求平均的结果越有说服力.这里根据情况设置了1或者10(见main函数的注释).有时间同学可以设大一些. 先贴结果: 分别对比的是:add(); addlast(); get(); remove() 方法. insert into arraylist for 10 times cost: 65 insert into linkedlist for 10 times cost: 170 insert into the last of arr

LinkedList和ArrayList的区别

LinkedList和ArrayList的区别 LinkedList和ArrayList的差别主要来自于Array和LinkedList数据结构的不同.如果你很熟悉Array和LinkedList,你很容易得出下面的结论: 1) 因为Array是基于索引(index)的数据结构,它使用索引在数组中搜索和读取数据是很快的.Array获取数据的时间复杂度是O(1),但是要删除数据却是开销很大的,因为这需要重排数组中的所有数据. 2) 相对于ArrayList,LinkedList插入是更快的.因为L

【Stackoverflow好问题】LinkedList、ArrayList各自的使用场景,如何确认应该用哪一个呢?

问题 LinkedList.ArrayList各自的使用场景是什么,如何确认应该用哪一个呢? 精华回答 一言以蔽之,在大部分情况下,使用ArrayList会好一些. 一.耗时上各有优缺点.ArrayList稍有优势. List只是一个接口,而LinkedList.ArrayList是List的不同实现.LinkedList的模型是双向链表,而ArrayList则是动态数组 首先对比下常用操作的算法复杂度 LinkedList get(int index) : O(n) add(E element

LinkedList和ArrayList区别

查询 LinkedList查询用的遍历,AyyayList查询用的是数组下标,所以对于查询ArrayList性能高于LinkedList 新增 新增在末尾或者中间就是ArrayList比LinkedList快,如果在最前面就是LinkedList比ArrayList快 测试一下新增在末尾 public static void main(String[] args){          int flag = 100000; ArrayList aList = new ArrayList(flag)

The difference (advantages & disavanteges ) between Arraylist and Linkedlist

先放总结: ArrayList 在时间复杂度上表现出 查询快  更改操作消耗大的特点,而LinkedList则表现出 查询相对耗费大,而更改快的特点 所以两种list可以择优使用! 首先 放上自己打的一段 模仿 残缺的 LinkedList 代码: 1 public class linkListDemo { 2 /** 3 * first refer to the first ele 4 * last refer to the last ele , Object 5 * */ 6 private