MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Java knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the unique feature of LinkedHashSet? |
| A. | It is not a valid class |
| B. | It maintains the insertion order and guarantees uniqueness |
| C. | It provides a way to store key values with uniqueness |
| D. | The elements in the collection are linked to each other |
| Answer» C. It provides a way to store key values with uniqueness | |
| 2. |
What happens if two threads simultaneously modify TreeSet? |
| A. | ConcurrentModificationException is thrown |
| B. | Both threads can perform action successfully |
| C. | FailFastException is thrown |
| D. | IteratorModificationException is thrown |
| Answer» B. Both threads can perform action successfully | |
| 3. |
What is the difference between TreeSet and SortedSet? |
| A. | TreeSet is more efficient than SortedSet |
| B. | SortedSet is more efficient than TreeSet |
| C. | TreeSet is an interface; SortedSet is a concrete class |
| D. | SortedSet is an interface; TreeSet is a concrete class |
| Answer» E. | |
| 4. |
Set has contains(Object o) method. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
What does Collections.emptySet() return? |
| A. | Immutable Set |
| B. | Mutable Set |
| C. | The type of Set depends on the parameter passed to the emptySet() method |
| D. | Null object |
| Answer» B. Mutable Set | |
| 6. |
What is the default clone of HashSet? |
| A. | Deep clone |
| B. | Shallow clone |
| C. | Plain clone |
| D. | Hollow clone |
| Answer» C. Plain clone | |
| 7. |
WHAT_IS_THE_DIFFERENCE_BETWEEN_TREESET_AND_SORTEDSET??$ |
| A. | TreeSet is more efficient than SortedSet |
| B. | SortedSet is more efficient than TreeSet |
| C. | TreeSet is an interface; SortedSet is a concrete class |
| D. | SortedSet is an interface; TreeSet is a concrete class |
| Answer» C. TreeSet is an interface; SortedSet is a concrete class | |
| 8. |
What is the relation between hashset and hashmap? |
| A. | HashSet internally implements HashMap |
| B. | HashMap internally implements HashSet |
| C. | HashMap is the interface; HashSet is the concrete class |
| D. | HashSet is the interface; HashMap is the concrete class |
| Answer» B. HashMap internally implements HashSet | |
| 9. |
What are the initial capacity and load factor of HashSet? |
| A. | 10, 1.0 |
| B. | 32, 0.75 |
| C. | 16, 0.75 |
| D. | 32, 1.0 |
| Answer» D. 32, 1.0 | |
| 10. |
Do we have get(Object o) method in HashSet. |
| A. | True |
| B. | False |
| Answer» C. | |