Difference Between ArrayList and Vector In Java?

ArrayList

ArrayList is not synchronized because it can be used by two threads simultaneously.

ArrayList is fast because it is non-synchronized

ArrayList uses Iterator interface to traverse the elements

 Example:

import java.util.*; 

public class ArrayListDemo{ 

 public static void main(String args[]){ 

  ArrayList<String> li1=new ArrayList<String>(); //Creating arraylist 

  li1.add("Dipak");//Adding object in arraylist 

 li1.add("Debasish"); 

  li1.add("harish"); 

  li1.add("surya"); 

  //Traversing list through Iterator 

  Iterator itr=li1.iterator(); 

  while(itr.hasNext()){ 

   System.out.println(itr.next()); 

  } 

 } 

} 

Output:

Dipak

Debasish

harish

surya

Vector

Vector is synchronized because it cannot be used by two threads simultaneously.

Vector is slow because it is synchronized

Vector uses Enumeration interface to traverse the elements

Example:

         import java.util.*;     

          public class VectorDemo{     

           public static void main(String args[]){    

 

            Vector<String> ve1=new Vector<String>();//creating vector 

            ve1.add("Dipak");//method of Collection 

            ve1.addElement("Debasish");//method of Vector 

            ve1.addElement("Harish"); 

            //traversing elements using Enumeration 

           ve1.addElement("Surya");

            Enumeration e1=ve1.elements(); 

          while(e1.hasMoreElements()){ 

             System.out.println(e1.nextElement()); 

            } 

           }     

          }

Output:

Dipak

Debasish

harish

surya

Similar Between ArrayList  and  Vector

ArrayList

ArrayList is a part of  Collection

Java.util package is used in  ArrayList

ArrayList provides  dynamic arrays in Java

ArrayList inherits AbstractList class and implements List interface

Vector

Vector is a part of  Collection 

Java.util package is used in Vector

Vector provides  dynamic arrays in Java

Vector  inherits AbstractList class and implements List interface