Master Comparator in Java | Custom Sorting Logic Using Class, Anonymous & Lambda

Unlock the power of custom sorting in Java! In this video, we break down the Comparator Interface in Java and show you how to implement custom sorting logic using multiple approaches — perfect for interviews, coding rounds, and real‑world Java development. Whether you're a beginner or preparing for a technical interview, this tutorial will help you understand: ✅ What is the Comparator Interface? ✅ Why & when to use Comparator vs Comparable ✅ How custom sorting works internally using compare(o1, o2) ✅ How to implement Comparator using: • A separate class • Anonymous inner class • Lambda expressions • Comparator.comparing() (modern Java 8+ approach) ✅ Multi‑level sorting (sort by age → then by id) ✅ Real‑world examples simplified with clear explanations ✅ What You Will Learn How Java decides sorting order using positive/zero/negative return values Custom sorting of Student objects How lambdas make sorting cleaner Modern Java techniques for production‑ready code Common interview questions around Comparator