To reverse a linked list, we need to change the direction of the pointers of each node. We can achieve this by traversing the list and updating the next pointer of each node to point to its previous node. We also need to keep track of the previous, current, and next nodes while traversing.

Here's a simple algorithm to reverse a singly linked list:

1. Initialize three pointers: prev, current, and next. Set prev and next to null, and current to the head of the list.
2. Iterate through the list while the current pointer is not null:
   1. Set next to the next node of current.
   2. Change the next pointer of current to point to prev.
   3. Update prev to current.
   4. Update current to next.
3. After the iteration, update the head of the list to point to the prev node, which is now the new first node of the reversed list.

Here's an example of a Java code snippet that reverses a singly linked list:

1class Node {
2  int data;
3  Node next;
4
5  public Node(int data) {
6      this.data = data;
7      this.next = null;
8  }
9}
10
11class LinkedList {
12  Node head;
13
14  // Reverse the linked list
15  void reverse() {
16      Node prev = null;
17      Node current = head;
18      Node next = null;
19
20      while (current != null) {
21          next = current.next;
22          current.next = prev;
23          prev = current;
24          current = next;
25      }
26      head = prev;
27  }
28}

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class Main {

  public static void main(String[] args) {

    // replace with your Java logic here

    Node prev = null;

    Node current = head;

    Node next = null;

​

    while (current != null) {

        next = current.next;

        current.next = prev;

        prev = current;

        current = next;

    }

    head = prev;

  }

}