Question

How do I iterate through a hashmap (containing objects of type Person) and calling methods on the Person object?

I used:

for(Iterator it = hashmap.entrySet().iterator(); is.hasNext();){
    Person p = (Person)it.next();
    p.doSomething();
}

but when the Person cast is being performed it says the object cannot be cast to a Person object (however it definitely is a subtype of Person).

java.util.HashMap$Entry cannot be cast to Person.

EDIT this is 1.4!

Answer 1

As your iterator will be walking through Map.Entry objects, extract them out as those types first:

Person p = (Person)((Map.Entry)it.next()).getValue();