title: HashMap initialization parameters (load / initialcapacity)
body: <p>What values should I pass to create an efficient <code>HashMap</code> / <code>HashMap</code> based structures for N items?</p>
  
  <p>In an <code>ArrayList</code>, the efficient number is N (N already assumes future grow). What should be the parameters for a <code>HashMap</code>? ((int)(N * 0.75d), 0.75d)? More? Less? What is the effect of changing the load factor?</p>