Accenture interview question

1. How garbage collection works in java 2. Diff. Between String s = "string"; and String s = new String("string"); 3. Final Finally Finalize keywords 4. JRE JVM JDK 5. Public static void main 6. Internal working of HashSet 7. Hierarchy of ArrayList 8. Collection framework introduced in java __ 9. Features of Java 8.0 10. Why java is not purely Object Oriented Programming language 11. SQL query to get 3rd highest salary employee.