RemoveDuplicatesSortedList.java

package com.interview.linklist;

/**
 * http://www.geeksforgeeks.org/remove-duplicates-from-a-sorted-linked-list/
 * Test cases
 * All duplicates
 * No duplicates
 * Duplicates only in starting
 * Duplicates only at the end
 * 0 1 or more nodes in the list
 */
public class RemoveDuplicatesSortedList {

    public void removeDuplicates(Node head){
        if(head == null){
            return;
        }
        Node current = head;
        while(current != null && current.next != null){
            if(current.data == current.next.data){
                current.next = current.next.next;
            }else{
                current = current.next;
            }
        }
    }
    
    public static void main(String args[]){
        LinkList ll = new LinkList();
        Node head = null;
        head = ll.addNode(1, head);
        head = ll.addNode(1, head);
        head = ll.addNode(1, head);
        head = ll.addNode(4, head);
        head = ll.addNode(4, head);
        head = ll.addNode(5, head);
        head = ll.addNode(6, head);
        head = ll.addNode(6, head);
        head = ll.addNode(6, head);
        RemoveDuplicatesSortedList rds = new RemoveDuplicatesSortedList();
        rds.removeDuplicates(head);
        ll.printList(head);
    }
}