Answer Posted / janardhan

ArrayList contains all methods are non-synchronized methods.
ArrayList by default not threadsafe.
ArrayList allows duplicate objects.
ArrayList default size is 16.if you want to increase size
use this formula:-- defaultsize * 3/2 + 1.
we can make araylist as synchronised:--

List l=Collections.SynchronizedList(new arrayList());

Arraylist is best choice for retrival operation and worest
choice for insert operation.


Vector:--

Vector is same like arraylist, but we have only one
difference is vector contains all synchronized methods.

Vector is best choice for retrival operation and worest
choice for insert operation.

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