question: public Hashtable ( Map < ? extends K , ? extends V > t ) { this ( Math . max ( 2 * t . size ( ) , 11 ) , 0.75f ) ; putAll ( t ) ; }
target:  Constructs a new hashtable with the same mappings as the given Map.  The hashtable is created with an initial capacity sufficient to hold the mappings in the given Map and a default load factor (0.75).