ArrayList and Vector both implements List interface and maintains insertion order. Differences between ArrayList and Vector classes that are given below.
| ArrayList | Vector |
|---|---|
| ArrayList is not synchronized. | Vector is synchronized. |
| ArrayList increments 50% of current array size if number of element exceeds from its capacity. | Vector increments 100% means doubles the array size if total number of element exceeds than its capacity. |
| ArrayList is fast because it is non-synchronized. | Vector is slow because it is synchronized i.e. in multithreading environment, it will hold the other threads in runnable or non-runnable state until current thread releases the lock of object. |
| ArrayList uses Iterator interface to traverse the elements. | Vector uses Enumeration interface to traverse the elements. But it can use Iterator also. |
Example
import java.util.*;
class TestVector1{
public static void main(String args[]){
// Creating vector
Vector<String> v=new Vector<String>();
v.add("umesh");
// Traversing elements using Enumeration
Enumeration e=v.elements();
while(e.hasMoreElements()){
System.out.println(e.nextElement());
}
}
}