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ArrayList and LinkedList both implements List interface and maintains insertion order. Both are non synchronized classes.
But there are many differences between ArrayList and LinkedList classes that are given below.
| ArrayList | LinkedList |
|---|---|
| ArrayList internally uses dynamic array to store the elements. | LinkedList internally uses doubly linked list to store the elements. |
| Manipulation with ArrayList is slow because it internally uses array. If any element is removed from the array, all the bits are shifted in memory. | Manipulation with LinkedList is faster than ArrayList because it uses doubly linked list so no bit shifting is required in memory. |
| ArrayList class can act as a list only because it implements List only. | LinkedList class can act as a list and queue both because it implements List and Deque interfaces. |
| ArrayList is better for storing and accessing data. | LinkedList is better for manipulating data. |
Example of ArrayList and LinkedList in Java
Let’s see a simple example where we are using ArrayList and LinkedList both.
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
public class ListIteration
{
private static List<String> arrayList = new ArrayList<>();
private static List<String> linkedList = new LinkedList<>();
public static void initializeList(List<String> list, int bufferSize)
{
for (int i = 0; i < 50000; i++) { byte[] buffer = null; if (bufferSize > 0)
{
buffer = new byte[bufferSize];
}
String s = String.valueOf(i);
list.add(s);
// avoid buffer to be optimized away
if (System.currentTimeMillis() == 0)
{
System.out.println(buffer);
}
}
}
public static void bench(List<String> list)
{
if (list.contains("bar"))
{
System.out.println("bar found");
}
}
public static void main(String[] args) throws Exception
{
if (args.length != 2) return;
int bufferSize = Integer.parseInt(args[0]);
initializeList(arrayList, bufferSize);
initializeList(linkedList, bufferSize);
System.out.println("init done");
System.out.println("ArrayList: " + arrayList);
System.out.println("LinkedList: " + linkedList);
}
}
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