– Resizable and Growable Data Structure are there in Array List.

– Dublicates are allowed.

– Insertion order is preserved, hettrogenous and homogeneous object are allowed ( aceapt Tree Set & Tree Map)

– Null insertion is possible

– Array list is implemented with serializable and clonable .

– Implemented by Random Access Interface ( This is a marker interface in java.util package)

– Best choice for retrieval operations because of Random Access Interface (I) . Wrost choice is insertion and deletion in the middle.