CTCI 2.1

Write code to remove duplicates from an unsorted linked list.
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How would you solve this problem if a temporary buffer is not allowed?

CTCI 2.1.java

public static void removeDuplicateNode(Node root){
    while(root != null){
        Node thisNode = root;
        while(thisNode.next != null){
            if(thisNode.next.data == root.data) thisNode.next = thisNode.next.next;
            //be careful of this 'else'
            else thisNode = thisNode.next;
        }
        root = root.next;
    }
}