🔥 Ready to test your Java mastery? Here are 20 hard-level Java questions that go beyond syntax designed to challenge your logic, OOP understanding, and problem-solving depth. These are the kind of questions FAANG and top startups use to separate coders from engineers. If you can solve even half of them you’re already ahead of 90% of candidates. 📘 Master concepts like multithreading, memory management, collections, design patterns & real-world problem-solving — the areas that truly matter in hi
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