title: HashTable with constant size
body: <p>I'm currently working on a holiday project aimed at simulating biological body clocks. The long &amp; short of it is that I've decided to use a hash table as a "concentration" object to simulate a cell and its interacting units.</p>
  
  <p>My main question is: is it possible to use the Java standard HashTable in such a way that it has a constant size? i.e. regardless of input (which will be appropriately limited) it doesn't change.</p>
  
  <p>Thanks in advance!
  David</p>