How to get sub lists of a list

[pjoisha]

Hi all,
I'm using Arrays.sort(Object[], Comparator) to help sort some of my objects. However, I now have a need to create sublists off of a sorted list
For example I have a list of following objects
Person[] person = new Person[3];
// The Person constructor takes
// LastName, FirstName
person[0] = new Person(Goodyear, Nancy);
person[1] = new Person(Clark,Stanley);
person[2] = new Person(Goodyear, Elvis);
I sort them
Array.sort(person, Person.LastNameComparator);
The list ends up being
Clark, Stanley
Goodyear, Nancy
Goodyear, Elvis
However, what I want the sort interface to return is a an array of sub lists (each sub list has only duplicates in them) as follows
SubList1: Clark, Stanley
SubList1: Goodyear, Nancy
Goodyear, Elvis
Are there any Java APIs or some other techniques available to do this?
Thanks in advance
PJ

[Joel McNary]

I have always used something akin to the following:

class Person implements Comparable{
private String firstName;
private String lastName;
public String getFirstName(){
return firstName;
}
public String getLastName(){
return lastName;
}
public Person(String aLastName, String aFirstName){
firstName = aFirstName;
lastName = aLastName;
}
public String toString(){
return lastName + ", " + firstName;
}
public int compareTo(Object o){
Person aPerson = (Person) o;
return this.toString().compareTo(aPerson.toString());
}
}
public class Test{
public static void main(String[] argv){
new Test().run();
}
public void run(){
java.util.Map aMap = new java.util.TreeMap();
Person aPerson = new Person("Goodyear", "Nancy");
this.addPersonToMap(aPerson, aMap);
aPerson = new Person("Clark", "Stanley");
this.addPersonToMap(aPerson, aMap);
aPerson = new Person("Goodyear", "Elvis");
this.addPersonToMap(aPerson, aMap);
java.util.Iterator anIterator = aMap.keySet().iterator();
while (anIterator.hasNext()){
java.util.Collection aCollection = (java.util.Collection) aMap.get(anIterator.next());
java.util.Iterator iter2 = aCollection.iterator();
System.out.println("List:");
while (iter2.hasNext()){
System.out.println("\t" + iter2.next());
}
}
}
public void addPersonToMap(Person aPerson, java.util.Map aMap){
java.util.Set aSet = (java.util.Set) aMap.get(aPerson.getLastName());
if (aSet == null){
aSet = new java.util.TreeSet();
aMap.put(aPerson.getLastName(), aSet);
}
aSet.add(aPerson);
}
}

[pjoisha]

Thanks Joel