Advanced Quiz 1
1. Which Java feature allows a class to have only one instance?
2. What is the purpose of the volatile keyword?
3. Which annotation is used to suppress compiler warnings?
4. What does the finalize() method do?
5. Which Java collection is thread-safe and maintains insertion order?
6. Which class is used for reading and writing objects to a file?
7. What is the result of calling notify() on an object?
8. Which of the following is NOT a functional interface in Java?
9. What is the main advantage of using streams in Java 8+?
10. Which method in the Optional class returns the value if present, else a default?
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