Linked List Operations in Java

class ListNode {
    int value;
    ListNode next;

    ListNode(int value) {
        this.value = value;     // Holds the value or data of the node
        this.next = null;       // Points to the next node in the linked list; default is null
    }
}

// Initialization of linked list
public class LinkedListExample {
    public static void main(String[] args) {
        ListNode head = new ListNode(1);
        head.next = new ListNode(2);
        head.next.next = new ListNode(3);
        head.next.next.next = new ListNode(4);
        head.next.next.next.next = new ListNode(5);
    }
}

class ListNode {
    int value;
    ListNode next;

    ListNode(int value) {
        this.value = value;
        this.next = null;
    }
}

public class ReverseLinkedList {
    public static ListNode reverseLinkedList(ListNode head) {
        ListNode prev = null;
        ListNode current = head;
        while (current != null) {
            ListNode nextNode = current.next;
            current.next = prev;
            prev = current;
            current = nextNode;
        }
        return prev;
    }

    // Test
    public static void main(String[] args) {
        ListNode head = new ListNode(1);
        head.next = new ListNode(2);
        head.next.next = new ListNode(3);
        head.next.next.next = new ListNode(4);
        head.next.next.next.next = new ListNode(5);

        ListNode reversedHead = reverseLinkedList(head);
        while (reversedHead != null) {
            System.out.print(reversedHead.value + " ");
            reversedHead = reversedHead.next;  // Output: 5 4 3 2 1
        }
    }
}