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70 changes: 70 additions & 0 deletions linked_list/ReverseLinkedList.java
Original file line number Diff line number Diff line change
@@ -0,0 +1,70 @@
class Node {
int data;
Node next;

Node(int data) {
this.data = data;
this.next = null;
}
}

class LinkedList {
Node head;

LinkedList() {
head = null;
}

void insert(int data) {
Node newNode = new Node(data);
if (head == null) {
head = newNode;
} else {
Node current = head;
while (current.next != null) {
current = current.next;
}
current.next = newNode;
}
}

void reverse() {
Node prev = null;
Node current = head;
Node next = null;
while (current != null) {
next = current.next; // Store the next node
current.next = prev; // Reverse the current node's pointer
prev = current; // Move prev to the current node
current = next; // Move current to the next node
}
head = prev; // The new head is the last node (prev)
}

void display() {
Node current = head;
while (current != null) {
System.out.print(current.data + " -> ");
current = current.next;
}
System.out.println("null");
}
}

public class ReverseLinkedList {
public static void main(String[] args) {
LinkedList list = new LinkedList();
list.insert(1);
list.insert(2);
list.insert(3);
list.insert(4);

System.out.println("Original Linked List:");
list.display();

list.reverse();

System.out.println("Reversed Linked List:");
list.display();
}
}