question: retrieve the set of keys mapping to a value v. wo n't compile vs. above in java due to generics support through type erasure . concode_field_sep Hashtable<K,HashSet<V>> map concode_elem_sep Hashtable<V,HashSet<K>> rmap concode_field_sep int sizeKeys concode_elem_sep Set<K> keys concode_elem_sep boolean containsKey concode_elem_sep Set<V> values concode_elem_sep boolean isEmpty concode_elem_sep boolean checkFunctional concode_elem_sep boolean checkInjective concode_elem_sep HashSet<V> createNewValueSet concode_elem_sep boolean checkBijective concode_elem_sep boolean containsValue concode_elem_sep void put concode_elem_sep HashSet<K> createNewKeySet concode_elem_sep Set<V> get concode_elem_sep String toString concode_elem_sep int sizeValues
target: Set < K > function ( V arg0 ) { return ( rmap . get ( arg0 ) ) ; }