• Set keys = map.keySet();
• Iterator keysIterator =
keys.iterator();
•ask the map for its keySet
•ask the keySet to give you an
Iterator
•keysIterator is like a list of
the keys in the map
•You can infer from this code
that
–Set and Iterator are classes in
the Java API
–keySet is a method in class
TreeMap; it returns a Set
–iterator is a method in class
Set; it returns an Iterator