Need a java hashtable class that is more controlable

Hi,
I have a C hashtable code that I can easily remove an element in some specific bucket, and in some specific position of the linked list (for conflicted elelments). Also I can strictly specify the size of the hashtable, and the total elements in the hashtable.
However for java Hashtable class, it seems I don't have the flexibility to remove an element in some specific positions (like what I did in C) , also it seems I cannot exactly control the size of the hashtable.
Do I really need to translate my C code hashtable to my own Java Hashtable class to fulfill what I need? Or is there any better way to do it?
Many thanks!
TimY.

Sorry that I didn't explain my need clearly in the first message, let me try to do it now:
First, I need to fix the size of the hashtable because I don't want it consume too much of the memory. In my application, for example, I hope the maximum bucket size of my hash table less than 3000. And in each bucket, there are at most 10 conflicted elements are linked together, and they will be searched sequentially.
Second, if more elements need to be added to the hashtable but there are already 10 elements in the corresponding bucket, I would like to use some replacement algorithm like LRU, CLOCK to evict one element, and then put the new element there. This is the reason why I need to remove a specific element in a bucket.
Third, I wish the cost for lookup, add, remove is very low.
So should I use some other Java classes to implement my requirement, instead of using Java Hashtable class directly?
Many thanks for your prompt replies to my first message!
Tim.Y

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