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Thread: Replacing Node Value

  1. #1
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    Default Replacing Node Value

    Hey Guys, Could somebody point me in the right direction to replacing a node in a linked list?

    I have no clue on where to start, thus. I have no code to supply.

    I current have, a destory method, a find, a destroyFirstNode, a destroyLastNode, print, insert, etc etc... But I just have no clue on how to replace the nodes value....


    Any pointers?

    I don't want code, I actually want to learn, not memorise.

    Cheers, Pete.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Replacing Node Value

    To replace one node in a linked list with another node, copy the pointers and set the pointers that are used to put the new node in the list.
    To see what pointers need to be changed, take a piece of paper, draw some nodes in a linked list with the pointers that connect the nodes. Draw a new node outside of the linked list next to a node in the list. Then see what pointers need to be changed to put the new node in the list replacing the node that is in the list.

    Whoops, the above is to replace a node.
    To change the value that a node holds, find the node in the list and call the node's set method to change its contents.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    ProgrammablePeter (March 30th, 2014)

  4. #3
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    Default Re: Replacing Node Value

    public Node replace(Object data, Object value) {
    		Node current = head;
     
    		while(current != null) {
    			if(current.getData() == data) {
    				current.setData(value);
    				return current;
    			}
    			current = current.getNext();
     
    		}
    		return null;
    	}

    This works! Thanks man! Actually took me a while to figure it out, cheers! You're a star!

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