ARTICLE AD BOX
I am implementing a custom Singly Linked List in Java for a project, and I need to implement a method to reverse the list. The main constraint is that it must be done in-place (O(1) space complexity), meaning I should only manipulate the pointers of the existing nodes.
My current approach: I am trying to use three pointers (prev, current, and next), but I am having trouble correctly reassigning the head and tail at the end of the process to avoid losing references.
Minimal Reproducible Example:
public void reverseInPlace() { Node prev = null; Node current = head; Node next = null; tail = head; // The original head becomes the new tail while (current != null) { next = current.getNext(); current.setNext(prev); prev = current; current = next; } head = prev; }The issue: While the logic seems to work for lists with 3+ nodes, I’m concerned about edge cases. Is this the standard way to handle null pointers for empty lists or single-node lists in Java? Are there any potential memory leaks with this pointer reassignment?
