在正常的数据结构中：
LinkedList对增加和删除操作比ArrayList的性能要好
ArrayList则更擅长做查找遍历操作
但是今天在阅读ArrayList源码时发现，ArrayList的增加和删除操作是用native方法实现的，所以其真实性能可能会较想象中的好一些，所以今天就用jdk中提供的两个容器做一个性能比对

• 环境 jdk 1.8

• idea

  
  image.png

1w次

times = 10000
*****************************
测试：尾部增加元素
ArrayList   ----->   6047032
LinkedList  ----->   5327290
*****************************

*****************************
测试：尾部删除元素
ArrayList   ----->   2217388
LinkedList  ----->   1342834
*****************************

*****************************
测试：头增加元素
ArrayList   ----->   11537687
LinkedList  ----->   4129430
*****************************

*****************************
测试：头删除元素
ArrayList   ----->   2004844
LinkedList  ----->   784318
*****************************

*****************************
测试：随机位置增加元素
ArrayList   ----->   17337535
LinkedList  ----->   6830068
*****************************

*****************************
测试：随机位置查找元素
ArrayList   ----->   5874260
LinkedList  ----->   8369624
*****************************

*****************************
测试：随机位置更改元素
ArrayList   ----->   4312895
LinkedList  ----->   6101773
*****************************

*****************************
测试：随机位置删除元素
ArrayList   ----->   29385414
LinkedList  ----->   8368768
*****************************


Process finished with exit code 0

10w次

times = 100000
*****************************
测试：尾部增加元素
ArrayList   ----->   24804808
LinkedList  ----->   43177695
*****************************

*****************************
测试：尾部删除元素
ArrayList   ----->   38577416
LinkedList  ----->   11566340
*****************************

*****************************
测试：头增加元素
ArrayList   ----->   1956851814
LinkedList  ----->   40207634
*****************************

*****************************
测试：头删除元素
ArrayList   ----->   2967494
LinkedList  ----->   4663143
*****************************

*****************************
测试：随机位置增加元素
ArrayList   ----->   1273261296
LinkedList  ----->   10900909
*****************************

*****************************
测试：随机位置查找元素
ArrayList   ----->   5205409
LinkedList  ----->   4912038
*****************************

*****************************
测试：随机位置更改元素
ArrayList   ----->   8216096
LinkedList  ----->   7091364
*****************************

*****************************
测试：随机位置删除元素
ArrayList   ----->   1102387723
LinkedList  ----->   18923705
*****************************


Process finished with exit code 0

50w次

times = 500000
*****************************
测试：尾部增加元素
ArrayList   ----->   102073824
LinkedList  ----->   109622779
*****************************

*****************************
测试：尾部删除元素
ArrayList   ----->   36268510
LinkedList  ----->   12494350
*****************************

*****************************
测试：头增加元素
ArrayList   ----->   34781611889
LinkedList  ----->   118171589
*****************************

*****************************
测试：头删除元素
ArrayList   ----->   21939523
LinkedList  ----->   8944819
*****************************

*****************************
测试：随机位置增加元素
ArrayList   ----->   29949963586
LinkedList  ----->   45516108
*****************************

*****************************
测试：随机位置查找元素
ArrayList   ----->   30674364
LinkedList  ----->   30298028
*****************************

*****************************
测试：随机位置更改元素
ArrayList   ----->   39145769
LinkedList  ----->   39933936
*****************************

*****************************
测试：随机位置删除元素
ArrayList   ----->   30271861584
LinkedList  ----->   38692883
*****************************


Process finished with exit code 0

times = 1000000
*****************************
测试：尾部增加元素
ArrayList   ----->   211529391
LinkedList  ----->   194531840
*****************************

*****************************
测试：尾部删除元素
ArrayList   ----->   38223319
LinkedList  ----->   42298009
*****************************

*****************************
测试：头增加元素
ArrayList   ----->   141881889993
LinkedList  ----->   55003192
*****************************

*****************************
测试：头删除元素
ArrayList   ----->   25792262
LinkedList  ----->   27698745
*****************************

*****************************
测试：随机位置增加元素
ArrayList   ----->   143949528233
LinkedList  ----->   65495692
*****************************

*****************************
测试：随机位置查找元素
ArrayList   ----->   41698438
LinkedList  ----->   38416191
*****************************

*****************************
测试：随机位置更改元素
ArrayList   ----->   1233481744
LinkedList  ----->   59149302
*****************************

*****************************
测试：随机位置删除元素
ArrayList   ----->   142282579885
LinkedList  ----->   50594504
*****************************

源码

import java.util.*;

public class Main {

    public static void main(String[] args) {
        Random random = new Random(1000);
        Random random1 = new Random(10);
        ArrayList<Integer> arrayList = new ArrayList();
        LinkedList<Integer> linkedList = new LinkedList<>();
        long startTime;
        long endTime;
        int times = 10000;
        System.out.println("times = " + times);
        System.out.println("*****************************");
        System.out.println("测试：尾部增加元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.add(arrayList.size(), random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.add(random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();

        System.out.println("*****************************");
        System.out.println("测试：尾部删除元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.remove(arrayList.size() - 1);
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.removeLast();
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();

        System.out.println("*****************************");
        System.out.println("测试：头增加元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.add(0, random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.add(0, random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();

        System.out.println("*****************************");
        System.out.println("测试：头删除元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.remove(arrayList.size() - 1);
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.removeLast();
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();

        System.out.println("*****************************");
        System.out.println("测试：随机位置增加元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.add(Math.abs(arrayList.size() / random1.nextInt()), random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.add(Math.abs(linkedList.size()/random1.nextInt()), random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();
        System.out.println("*****************************");
        System.out.println("测试：随机位置查找元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.get(Math.abs(arrayList.size()/random1.nextInt()));
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.get(Math.abs(linkedList.size()/random1.nextInt()));
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();

        System.out.println("*****************************");
        System.out.println("测试：随机位置更改元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.set(Math.abs(arrayList.size()/random1.nextInt()), random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.set(Math.abs(linkedList.size()/random1.nextInt()), random.nextInt());
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();

        System.out.println("*****************************");
        System.out.println("测试：随机位置删除元素");
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            arrayList.remove(Math.abs(arrayList.size()/random1.nextInt()));
        }
        endTime = System.nanoTime();
        System.out.println("ArrayList   ----->   " + (endTime - startTime));
        startTime = System.nanoTime();
        for (int i = 0; i < times; i++){
            linkedList.remove(Math.abs(linkedList.size()/random1.nextInt()));
        }
        endTime = System.nanoTime();
        System.out.println("LinkedList  ----->   " + (endTime - startTime));
        System.out.println("*****************************");
        System.out.println();

    }
}