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Hints on how to replace an item in a linked list

Posted on 2006-11-21
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Medium Priority
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Last Modified: 2010-03-31
This is the code I have so far:

Do I need to use a temporary variable in order to replace the tracks?

public void replaceImage(Image t, int index)
{
            Image image = firstImage;

            for(int i = 1; i <= index; i++)
            {
                  image = image.getNext(); // finds image identified by the given index i.e. the one the user wants to replace
            }

            t.setNext(image.getNext()); //this and below replaces the references, well it should do
            t.setPrevious(image.getPrevious());

            t.setImageName(t.getImageName()); // t is the track name that should overwrite image
}

Thanks anyone
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Question by:john8932
  • 2
3 Comments
 
LVL 3

Expert Comment

by:nishayr
ID: 17992922
I would have to assume do the following after the for loop instead of the other 3 lines:

Image oldImage = t.getNext();
t.setNext(image);
image.setNext(oldImage.getNext());
image.getNext().setPrevious(image);
image.setPrevious(t);

Thanks,
Nish
0
 
LVL 3

Accepted Solution

by:
nishayr earned 500 total points
ID: 17992932
Actually, I forgot to check for a null...

Image oldImage = t.getNext();
t.setNext(image);
image.setNext(oldImage.getNext());
image.setPrevious(t);
if (image.getNext() != null)
    image.getNext().setPrevious(image);


Try that instead! 8)

Thanks,
Nish
0
 

Author Comment

by:john8932
ID: 17996192
I was only really looking for hints but thanks anyway.

Ive actually got it working now a different way.

Cheers
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