public Object get ( Object key , Object subKey ) { HashMap a = ( HashMap ) super . get ( key ) ; if ( a != null ) { Object b = a . get ( subKey ) ; return b ; } return null ; }
Returns the value to which this map maps the specified key and subKey . Returns null if the map contains no mapping for this key and subKey . A return value of null does not necessarily indicate that the map contains no mapping for the key and subKey ; it s also possible that the map explicitly maps the key to null . The containsKey operation may be used to distinguish these two cases .