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    <p>So it sounds as though you want to keep a history of the prior names for each element in the linked list. I would suggest that you store an array or linked list within each node of the linked list that shows the prior history of that item. For instance:</p> <pre><code>public class Node { Node next; String data; LinkedList&lt;String&gt; history; public Node (String data) { this.data = data; } } </code></pre> <p>You could populate this in many ways, that all really depend upon your use case.</p> <p>Also, why implement your own linked list? Java already comes with a linked list implementation (java.util.LinkedList). I'd suggest using this if you need an ordered list of the linked list variety. If you did this, then create a new data structure to be contained within it that has a name and history, then just maintain the history within that, such as:</p> <pre><code>public class DataItem { String data; LinkedList&lt;String&gt; history = new LinkedList&lt;&gt;(); public DataItem (String data) { this.data = data; } public void setData (String data) { this.history.add(0, this.data); this.data = data; } } </code></pre> <p>Ultimately, remember that strings are immutable in Java. So, a string cannot be modified. You only need to keep a reference to the prior string somewhere, you don't need to copy the value.</p> <p>To ultimately copy a tree of objects, you need to do what's called a deep copy, basically going through the full structure and all collections, and cloning each object into a new object.</p>
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