Array List vs Vector

[Muhammad Aasim]

What is difference between ArrayList and Vector? In which situation we use arrayList and Vector?

Answer:-ArrayList is like a resizeable array. ArrayList actually comes as a replacement the old "Vector" Collection. As we add or remove elements into or from it, it grow or shrinks over time?

Any thing else may please be tell?

[Ulf Dittmer]

One difference is that the methods in Vector are all synchronized, whereas the methods in ArrayList are not. That's important in multi-threaded environments.

[Fredrik Larsback]

Vector is synchronized, ArrayList isn't.

[Kaustav Ganguly]

First thing is Vector also implements a resizable array like ArrayList, so both are resizable data structures. Vector class is there in Java since the begining and ArrayList was intoduced as part of the Collection framework. Vector class is also retrofitted into the java collection framework to implement the List interface in Java 2 v1.2 . And finally Vector is synchronized and ArrayList is not.