READ Free Dumps For Oracle- 1z0-804
| Question ID 3482 | Which two are true about Singletons? |
| Option A | A. A Singleton must implement serializable. |
| Option B | B. A Singleton has only the default constructor. |
| Option C | C. A Singleton implements a factory method. |
| Option D | D. A Singleton improves a class's cohesion. |
| Option E | E. Singletons can be designed to be thread-safe. |
| Correct Answer | C,E |
| Question ID 3483 | What are two differences between Callable and Runnable? |
| Option A | A. A Callable can return a value when executing, but a Runnable cannot. |
| Option B | B. A Callable can be executed by a ExecutorService, but a Runnable cannot. |
| Option C | C. A Callable can be passed to a Thread, but a Runnable cannot. |
| Option D | D. A Callable can throw an Exception when executing, but a Runnable cannot. |
| Correct Answer | A,D |