An ArrayList is a newer class than a Vector. A Vector is considered a

legacy class in Java. The differences are:

1. Synchronization: Vector is synchronized, but the ArrayList

is not synchronized. So an ArrayList has faster operations

than a Vector.

2. Data Growth: Internally both an ArrayList and Vector use

an array to store data. When an ArrayList is almost full it

increases its size by 50% of the array size. Whereas a

Vector increases it by doubling the underlying array size

https://www.javatpoint.com/difference-between-arraylist-and-vector#:~:text=1)%20ArrayList%20is%20not%20synchronized,elements%20exceeds%20than%20its%20capacity.