ArrayList vs Vector vs SynchronizedList vs CopyOnWriteArrayList

Choosing the wrong Java List implementation can silently destroy performance or crash your application with concurrency bugs ⚠️ In this video, we break down the real differences between ArrayList, Vector, SynchronizedList, and CopyOnWriteArrayList so you know exactly when and why to use each one 💡 You’ll learn how thread safety actually works under the hood 🔒, why fail-fast iterators throw ConcurrentModificationException 💥, and how CopyOnWriteArrayList enables lock-free iteration in read-heavy systems 🚀 We also compare performance trade-offs 📊, memory behavior 🧠, iteration pitfalls ❌, and real-world use cases like event listeners and multi-threaded applications 🧵 If you’re preparing for Java interviews 🎯, working with concurrent systems 🖥️, or simply want to write safer and faster Java code ⚡, this video will save you hours of debugging ⏱️ If you found it helpful, consider liking 👍, subscribing 🔔 for the full Java Collections Mastery series, and sharing your questions or experiences in the comments 💬