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Program: How to reverse Singly Linked List?

Write a sample code to reverse Singly Linked List by iterating through it only once.

Recursive Method:
	1) Divide the list in two parts - first node and rest of the linked list.
	2) Call reverse for the rest of the linked list.
	3) Link rest to first.
	4) Fix head pointer.

package com.java2novice.ds.linkedlist;
public class SinglyLinkedListImpl<T> {
    private Node<T> head;
    public void add(T element){
        Node<T> nd = new Node<T>();
        System.out.println("Adding: "+element);
        Node<T> tmp = head;
        	if(tmp == null){
                //since there is only one element, both head and 
                //tail points to the same object.
                head = nd;
            } else if(tmp.getNextRef() == null){
            } else {
            	tmp = tmp.getNextRef();
    public void traverse(){
        Node<T> tmp = head;
            if(tmp == null){
            tmp = tmp.getNextRef();
    public void reverse(){
    	System.out.println("\nreversing the linked list\n");
    	Node<T> prev = null;
    	Node<T> current = head;
    	Node<T> next = null;
    	while(current != null){
    		next = current.getNextRef();
    		prev = current;
    		current = next;
    	head = prev;
    public static void main(String a[]){
        SinglyLinkedListImpl<Integer> sl = new SinglyLinkedListImpl<Integer>();
class Node<T> implements Comparable<T> {
    private T value;
    private Node<T> nextRef;
    public T getValue() {
        return value;
    public void setValue(T value) {
        this.value = value;
    public Node<T> getNextRef() {
        return nextRef;
    public void setNextRef(Node<T> ref) {
        this.nextRef = ref;
    public int compareTo(T arg) {
        if(arg == this.value){
            return 0;
        } else {
            return 1;

Adding: 3
Adding: 32
Adding: 54
Adding: 89

3	32	54	89	

reversing the linked list

89	54	32	3	
Next Program >>

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  1. How to reverse Singly Linked List?
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I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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