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1. What is the difference between a heap and a stack in Java?
2. What is a garbage collector and how does it work?
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3. What is the difference between a class and an interface?
4. What is polymorphism and how is it achieved in Java?
5. What is the difference between public, protected, and private access modifiers?
6. What is the difference between a checked and an unchecked exception?
7. What is the Java Virtual Machine (JVM) and what is its role?
8. What is the difference between a thread and a process?
9. What is the difference between synchronization and concurrency?
10. What is the difference between a volatile variable and an atomic variable?