Difference between ArrayList and Vector in Java

Published May 09, 2022

Java uses both ArrayList and vectors to implement List interfaces and maintain insertion order. However, there are several differences between the two. Below are four of the most prominent.

4 Differences between ArrayList and vector

Synchronisation: Vectors are synchronised, but ArrayList is not
Speed: Vectors are slower than ArrayLists because they are less synchronised, while ArrayLists are faster because they are non-synchronized
Iteration: Iteration in ArrayLists is achieved using the Iterator interface, whereas traversal in Lists is achieved by using the List interface.
Size: A vector increments 100% of its size when an element is added beyond its capacity, while an ArrayList increments 50% of its size if an element is added beyond its capacity.

Example of an ArrayList

import java.util.ArrayList;

import java.util.Iterator;

public class Arraylistszz {

public static void main(String[] args) {

ArrayList<String> ourArrayList = new ArrayList<String>();

ourArrayList.add("Java");

ourArrayList.add("Python");

ourArrayList.add("C++");

ourArrayList.add("PHP");

System.out.println("Our ArrayList Elements Include:");

Iterator myiterator = ourArrayList.iterator();

while (myiterator.hasNext())

System.out.println(myiterator.next());

}

Output:

Our ArrayList Elements Include:

Java

Python

C++

PHP

Example of a Vector

import java.util.Enumeration;

import java.util.Vector;

public class JavaSample {

public static void main(String[] args) {

Vector<String> vectali = new Vector<String>();

vectali.addElement("Python");

vectali.addElement("Java");

vectali.addElement("Kotlin");

System.out.println("\n We have added the following items in our vector:");

Enumeration enumeli = vectali.elements();

while (enumeli.hasMoreElements())

System.out.println(enumeli.nextElement());

}

Output

We have added the following items in our vector:

Python

Java

Kotlin

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