I am wondering about the parameters for constructing a ConcurrentHashMap:

  • initialCapacity is 16 by default (understood).
  • loadFactor is 0.75 by default.
  • concurrencyLevel is 16 by default.

My questions are:

  • What criteria should be used to adjust loadFactor up or down?
  • How do we establish the number of concurrently updating threads?
  • What criteria should be used to adjust concurrencyLevel up or down?

Additionally:

  • What are the hallmarks of a good hashcode implementation? (If an SO question addresses this, just link to it.)

Thank you!

java hashcode concurrenthashmap
Edit
Report