Hashmap capacity, load factor and fail-fast

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Capacity :

  •     Capacity is the Number of element HashMap can contain. 
  •     initial capacity is the capacity at the time the hash table is created 
  •     default initial capacity (16) 
  •     capacity increased (2 power n) , where n- number of elements
load factor :
  • Defines threshold of HashMap. When re-sizing will occur of HashMap.
  • The load factor is a measure of how full the hash table is allowed to get before its capacity is automatically increased.
  • default load factor (.75)
fail-fast :
  • The iterators returned by all of this class's are fail-fast
  •  After the iterator is created, if the map is modified at any time it will throw a ConcurrentModificationException

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