vector

[geetanjali rajput]

i know nothing about vector . please help. let me know it's usage.

[Cindy Glass]

You need to read up on Collections.

[Dirk Schreckmann]

If you are looking for more information on how to conceptualize what a Vector (or ArrayList, or any Collections class) is structurally, then I'd recommend learning about what an array is. Some useful on-line Java tutorials, that cover arrays, include:
Introduction to Computer Science using Java by Bradley Kjell - starting with chapter 46
Introduction to Programming Using Java by David J. Eck - starting with chapter 8
Good Luck.