The Iterators of the Map's keys and values are generic: : generics « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. generics

import java.util.Iterator;
import java.util.TreeMap;

public class MainClass {
  public static void main(String[] argv) {
    TreeMap<String, MyClass> nameToClass;
    nameToClass = new TreeMap<String, MyClass>();

    Iterator<String> nameIter = nameToClass.keySet().iterator();
    Iterator<MyClass> classIter = nameToClass.values().iterator();

  }
}

class MyClass {
}