Unlike collection types such as Vector or List, Map (HashTable or HashMap) accesses a value by a key. If we want to retrieve all the values that have been put in a Map, one of simple ways to do that is employing a Collection or plus an Iterator, here is the sample code (just retrieve vaules, skip keys), assuming there is a variable: HashMap<String, <ComplexDataType>> links

Collection c = links.value();
Vector<ComplexDataType> v = new Vector<ComplexDataType>(c);
for(int i = 0; i< v.size(); i++)
{
    ComplexDataType tempData = (ComplexDataType)v.get(i);
    dosomethingwith(tempData);
}


P.S. Map provides three views of map: keySet, entrySet and values collection, we can use any of them .