equal method on collection

[Barkat Mardhani]

import java.util.*;
public class Q4d3f {
   public static void main(String[] args) {
       LinkedList lla = new LinkedList();
       LinkedList llb = new LinkedList();
       assert lla.size() == llb.size() : "empty";
       lla.add("Hello");
       assert lla.size() == 1 : "size";
       llb.add("Hello");
       assert llb.contains("Hello") : "contains";
       assert lla.get(0).equals(llb.get(0)) : "element";
       assert lla.equals(llb) : "collection"; //1
   }
}

Why above code is not throwing assertion error at line 1?
Thanks
Barkat

[Andres Gonzalez]

hmm... good question. I do not know the answer, but I'd like to add one more thing:
If you don't override equals, two objects are considered equals if they referred to the same object.
probably it does not have anything to do with the question itself.
any other opinions?
[ July 24, 2003: Message edited by: Andres Gonzalez ]

[Barkat Mardhani]

I did little research on it. The equals method of LinkedList class will apply. And it is overridden. Per it's definition if two collections have same elements in same order, they considered same or in other words equal.
Hope this helps.
Barkat

[Andres Gonzalez]

Originally posted by Barkat Mardhani:
I did little research on it. The equals method of LinkedList class will apply. And it is overridden. Per it's definition if two collections have same elements in same order, they considered same or in other words equal.
Hope this helps.
Barkat

Thanks Barkat. I wonder if the overriding of equals is also done for all collection classes, besides LinkedList (according to you).
[ July 24, 2003: Message edited by: Andres Gonzalez ]

[Barkat Mardhani]

Thanks Barkat. I wonder if the overriding of equals is also done for all collection classes, besides LinkedList (according to you).

I checked couple more. Seems they overridden either in Abstractxxxx class or concrete class.