question: public ConcurrentReaderHashMap ( Map t ) { this ( Math . max ( ( int ) ( t . size ( ) / DEFAULT_LOAD_FACTOR ) + 1 , 16 ) , DEFAULT_LOAD_FACTOR ) ; putAll ( t ) ; }
target:  Constructs a new map with the same mappings as the given map.  The map is created with a capacity of twice the number of mappings in the given map or 16 (whichever is greater), and a default load factor.