237. Delete Node in a Linked List

Before delving into the intricacies of the Java solution, let’s understand the problem at hand. In a singly-linked list, each node contains a value and a reference to the next node in the sequence. The task is to delete a given node without access to the head of the linked list.

Unveiling the Java Solution

``````/**
* public class ListNode {
*     int val;
*     ListNode next;
*     ListNode(int x) { val = x; }
* }
*/
class Solution {
public void deleteNode(ListNode node) {
ListNode temp = node;
ListNode prev = node;
while (temp.next != null) {
temp.val = temp.next.val;
prev = temp;
temp = temp.next;
}
prev.next = null;
}
}
``````

Navigating the Code

1. Traversal Setup:
• The method `deleteNode` begins by initializing two pointers, `temp` and `prev`, both pointing to the given node.
2. Value Replacement Loop:
• A `while` loop traverses the linked list until the last node is reached (`temp.next != null`).
• Inside the loop, the value of the current node (`temp.val`) is replaced with the value of the next node (`temp.next.val`).
• The `prev` pointer is updated to the current `temp` position, preparing for the next iteration.
• The `temp` pointer moves to the next node.
3. Breaking the Chain:
• Once the loop completes, the last node’s value has been copied to its previous node.
• The `prev.next` pointer is set to `null`, effectively breaking the chain and deleting the last node.=

The brilliance of this Java solution lies in its simplicity and efficiency. By intelligently copying values and breaking the chain at the appropriate moment, the `deleteNode` method achieves the desired node deletion without compromising the integrity of the linked list.
As we conclude our exploration of the `deleteNode` method in the `Solution` class, we’ve witnessed the finesse required to navigate the intricacies of linked list manipulation. Deleting a node might seem straightforward, but this Java solution exemplifies the delicate balance between copying values and preserving the structure of a singly-linked list. As you embark on your coding endeavors, may this exploration serve as a guide in mastering the art of deleting nodes in the captivating world of linked lists.