Question

1. What’s the difference between an java.util.ArrayList and java.util.Vector? (hint:

there are two major differences)

2.What is the purpose of the @FXML notation in a JavaFX controller file? Is it

required?

3.HashMap and HashSet are not thread safe- by design. What are the hazards,

concerning concurrency? How would you solve this potential problem?

4. For Blocking Queues, put() and take() are synchronized methods. Why is this

required?

5.Whats the purpose of the “Volatile” keyword? Give an example of its use

Answer 1

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