What is the Proper way to nullify the VECTOR after it's scope is over

I am using Vectors and Array lists at many places in my Web Application, It is neccessary to use them.
In some processes I m storing bulk amount of data into vector due to that the performance of my application will be decreased, for that I have to nullify the vector after it's scope is over.
To nullify I m using Vector v = new Vector()
v.clear().
The above method is suitable in case of simple object data like strings and other values.
But I wanna know that If I m using HashMap and storing bulk data in it and then I m storing each HashMap into vector, what is the proper way.
Does I have to iterate each object of HashMap from vector and set them as null and then set vector as null or directly I can use v.clear() method??
If any having any answer regarding my question then plz reply your each valuable reply will be appriciable.
Thanks in advance......!!

JBOSS2000 wrote:
Each time in loop a new object of vector is created and each time I m nullifying it. Thats what I m doing.
Thats why I m nullifying it.
Even if I'll declare it out side the loop then also for the each iteration I have to nullify it cause what I m doing is I m inserting the data into database in each iteration of loop, So that I think it is must to nullify the objects each time.If it is constructed inside the loop then you do not have to nullify it. If it is constructed outside of the loop and you want to empty it for each iteration then just clear() it.

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