Linked list in Java
Practice this questionWANT TO UNDERSTAND THE CONCEPT FIRST?Learn Linked list in Java
Node structure
class ListNode {
int val;
ListNode next;
ListNode(int val) { this.val = val; }
}Common Java questions
- Reverse Linked List
- Middle of the Linked List
- Remove Nth Node from End
- Merge Two Sorted Lists
- Detect Cycle
- Intersection of Two Linked Lists
Pattern: reverse linked list
ListNode reverseList(ListNode head) {
ListNode prev = null;
ListNode curr = head;
while (curr != null) {
ListNode next = curr.next;
curr.next = prev;
prev = curr;
curr = next;
}
return prev;
}Interview guidance
Always handle null, single node, and last node carefully.
Adapted from 15_DSA_JAVA.md · “4. Linked list in Java”. Code examples are study fragments. Difficulty and core labels are editorial estimates; version-specific behavior should be checked against your project.