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Summary
I recently interviewed at Cars24 for an SDE 1/2 role in a walk-in interview at their Gurgaon office. The interview primarily covered core Java concepts like HashMap and ConcurrentHashMap, Spring annotations, and a Data Structures and Algorithms question on constructing a BST from its preorder traversal, ultimately resulting in a rejection.
Full Experience
I recently had a walk-in interview at Cars24's Gurgaon office for an SDE 1/2 role. I had applied for this opportunity after seeing a LinkedIn post by a recruiter and emailing my resume. The interview lasted about 30 minutes and consisted of several technical questions focusing on Java fundamentals and data structures. After addressing the questions, I inquired about potential feedback, but unfortunately, the verdict was a rejection.
Interview Questions (8)
Explain what a HashMap is in Java.
Describe the internal working mechanism of a HashMap.
Explain how HashMap handles collisions.
Explain what a ConcurrentHashMap is in Java.
Describe the key differences between HashMap and ConcurrentHashMap.
Explain how ConcurrentHashMap is optimized compared to HashMap.
Explain the difference between the @Service and @Repository annotations in Spring.
Given the preorder traversal of a Binary Search Tree (BST) as [8, 5, 1, 7, 10, 12], describe how to construct the BST from it.