one to many collection implementation

jhedden · **Joined:** Wed May 14, 2008 6:13 pm **Posts:** 1

Is there a difference between:

Code:

public class Category {
   @OneToMany
   private List<Category> childCategories = new ArrayList<Category>(); 
}

and

Code:

public class Category {
   @OneToMany
   private Set<Category> childCategories = new HashSet<Category>(); 
}

or is this just a matter of preference?

Cameron McKenzie · **Posted:** Wed May 14, 2008 11:08 pm

I believe a Set cannot have duplicate entries, while a List might.

Quote:

Set A collection that contains no duplicate elements.

Quote:

List An ordered collection (also known as a sequence).