Implementation of own LinkedList

Question

I am implementing my own LinkedList. I've a class which calls MyLinkedLlist, inside MyLinkedList only size() and iterator() have been implemented. Besides I've one Abstract class where all my other necessary functions for LinkedList in. The abstract class prototype is:

public abstract class MyAbstractSequentialList implements List

I wonder if I need to implement equals() method inside my abstract class or it is already implemented for me because of I inherit List?

when i write "public abstract class MyAbstractSequentialList implements List" eclipse show me some methods but not equals(). — cyo
– cyo, Commented Apr 5, 2012 at 6:01
actually how can compiler says if i need or not implement equals() method,because it is up to me? — cyo
– cyo, Commented Apr 5, 2012 at 6:05
there is no error when i didn't implement equals() method..when i call it for testing it works but returns false which shouldn't be the result — cyo
– cyo, Commented Apr 5, 2012 at 6:07
My bad, I expected a compile-time warning. Noise deleted. Hope you get a suitable answer. :) — Andrew Thompson
– Andrew Thompson, Commented Apr 5, 2012 at 6:29

Samarth Bhargava · Accepted Answer · 2012-04-05 05:52:02Z

5

List is an interface. So, there won't be any default implementation. You can choose to implement one if you need. Note that if you override equals, you must override hashcode as well.

answered Apr 5, 2012 at 5:52

Samarth Bhargava

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Community · Accepted Answer · 2020-06-20 09:12:55Z

1

List is an interface and equals() is not implemented in List because all methods in any interface should be abstract.

So you have to implement equals() method in your abstract class. if not, you have to implement it in any subclass which extends your abstractclass.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Apr 5, 2012 at 5:52

Chandra Sekhar

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Girish · Accepted Answer · 2013-05-31 04:45:55Z

1

List is an interface so if you want to implement in your own LinkedList so you have to override means implement equals() because there is contract with interface if you are implementing then you have to implements its methods as well.

edited May 31, 2013 at 4:45

Girish

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answered May 31, 2013 at 4:27

Sheel

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