Sorting problem

I created a vector and I need to sort it by last name

is there any way somebody can help me to solve this problem

code is some what like this

Vector searchResult = new Vector();

for(int i=0; i<employeeIds.size();i++)

{

IUserFactory iUserFactory = UMFactory.getUserFactory();

try

{

logger.severe("user factory is :"+(String)employeeIds.get(i));

.

.

.

SearchResultBean searchResultBean = new SearchResultBean();

searchResultBean.setEmailAddress(iUser.getEmail());

.

.

searchResultBean.setLastName(iUser.getLastName());

searchResult.add(searchResultBean);

// I need to return the searchResult sorted by Last name

return searchResult;

}