Session 19 - Review Session
- 1. Java & JEE Training Session 19 – Review Sessions
- 2. Page 2Classification: Restricted Agenda • How to prepare for a typical Java interview? • Typical interview questions…
- 3. Page 3Classification: Restricted Explain the different access modifiers.. • Public • Private • Default • Protected
- 4. Page 4Classification: Restricted Code output?
- 5. Page 5Classification: Restricted Code output? c. Autoboxing will convert a short to a Short, but not to an Integer.
- 6. Page 6Classification: Restricted Code output?
- 7. Page 7Classification: Restricted Code output? a. "j" will be converted to an Integer automatically when it is passed to compareTo().
- 8. Page 8Classification: Restricted Code output?
- 9. Page 9Classification: Restricted Code output? d. "i" will not be converted to an Integer automatically because there is no assignment nor casting there.
- 10. Page 10Classification: Restricted What is the output?
- 11. Page 11Classification: Restricted What is the output? It will print “a”. The g() in Bar is not overriding the g() in Foo. It is just overloading the name "g". When determining which method to call, autoboxing is not considered first so only the g() in Foo is applicable and thus is used.
- 12. Page 12Classification: Restricted True or False “X extends Y” is correct if and only if X is a class and Y is an interface.
- 13. Page 13Classification: Restricted True or False “X extends Y” is correct if and only if X is a class and Y is an interface. False
- 16. Page 16Classification: Restricted What is the output?
- 17. Page 17Classification: Restricted What is the output? Compilation error on lines that print f.a and f.b
- 18. Page 18Classification: Restricted Which of these is not correct?
- 19. Page 19Classification: Restricted Which of these is not correct? All are correct
- 20. Page 20Classification: Restricted What is the output?
- 21. Page 21Classification: Restricted What is the output? Compilation error… cannot invoke countGold from static context
- 22. Page 22Classification: Restricted What is the difference between a List and a Set? Set: HashSet: Default Set …must implement equals and hashCode LinkedHashSet: Maintains the elements in the order in which they were entered TreeSet: Maintains in ascending order/sorted TreeSet<Student> ts = new TreeSet<Student>(); Comparable: Default comparison logic…. Student implements Comparable… override compareTo() Comparator: Multiple Comparator classes by implementing Comparator and overriding compare()
- 23. Page 23Classification: Restricted What is the difference between a List and a Set? • List, by default characteristic maintains order; a set does not. • A set does not entertain duplicate members; whereas a List does
- 24. Page 24Classification: Restricted Topics to be covered in next session • Collections – Maps • Map Interface • Map methods • Map views • Map.Entry • HashMap and TreeMap • HashMap • HashMap Constructors • HashMap Methods • Utilities