Lock-Free Concurrency in Java - 2 | CAS Retry, Compare-and-Swap & ABA Problem | Java Full Course #55

In this continuation of our Java Lock-Free Concurrency series, we go deeper into how atomic variables actually work internally and how they are different from volatile. In the previous video, we discussed AtomicInteger, AtomicLong, AtomicBoolean, AtomicReference, and the basic idea of CAS. In this video, we build on that foundation and understand the real difference between atomic operations and volatile visibility, along with the retry mechanism used by CAS-based operations. We also discuss the Compare-and-Swap operation in detail and understand why CAS keeps retrying when multiple threads try to update the same value at the same time. Finally, we cover one of the most important problems in lock-free programming: the ABA Problem. In this video, you will learn: Difference between atomic and volatile in Java Why volatile only solves the visibility problem Why volatile does not guarantee atomicity How atomic classes provide both visibility and atomic updates What is CAS retry logic? How Compare-and-Swap works internally Why CAS may fail and retry again How CAS avoids traditional locking What is the ABA problem in CAS? Why ABA is dangerous in lock-free concurrency How ABA can affect correctness in multithreaded programs This video is important for anyone learning Java multithreading, Java concurrency, and the internal working of lock-free programming. It will help you understand why atomic variables are more powerful than volatile and how CAS-based retry logic makes concurrent updates thread-safe. Why Learn Java? Java is one of the most powerful and widely used programming languages in the world. It is used in: Backend development Enterprise applications Android development Banking systems Large-scale distributed systems If you want to master Data Structures, Spring Boot, Microservices, or System Design, Java fundamentals are essential. Join Coder Army Whatsapp Group: https://whatsapp.com/channel/0029Va6H0tbHVvTbcuT99Y1f Join System Design Whatsapp Group: https://whatsapp.com/channel/0029VbBF1XKF1YlMyYuPM23s Code and Notes: Github : https://github.com/adityatandon15/Java-Full-Course We offer paid course on Dsa, web development, blockchain, system design and GenAI. Join our Paid Course: https://strikes.in/ Coder Army: https://coderarmy.in/#home Coder Army app: https://play.google.com/store/apps/details?id=com.rohit.negi Connect with Aditya Tandon Instagram : https://www.instagram.com/adityatandon2 LinkedIn : https://www.linkedin.com/in/adityatandon2 Twitter : https://x.com/adityatandon02 Timestamps: Atomic vs Volatile Java, Volatile in Java, Atomic Variables Java, CAS Retry Logic Java, Compare and Swap Java, Compare and Set Java, ABA Problem Java, Java Multithreading, Java Concurrency, Lock-Free Concurrency Java, AtomicInteger Java, AtomicReference Java, Thread Safety Java, Race Condition Java, Java Full Course, Java Interview Questions.