java.util Package Questions And Answers

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java.util Package Questions & Answers

1. Which of these standard collection classes implements a dynamic array?

java.util Package Questions & Answers

2. Which of these class can generate an array which can increase and decrease in size automatically?

java.util Package Questions & Answers

3. Which of these method can be used to increase the capacity of ArrayList object manually?

java.util Package Questions & Answers

4. Which of these method of ArrayList class is used to obtain present size of an object?

java.util Package Questions & Answers

5. Which of these methods can be used to obtain a static array from an ArrayList object?

java.util Package Questions & Answers

6. Which of these method is used to reduce the capacity of an ArrayList object?

java.util Package Questions & Answers

7. Which of these standard collection classes implements a linked list data structure?

java.util Package Questions & Answers

8. Which of these classes implements Set interface?

java.util Package Questions & Answers

9. Which of these method is used to add an element to the start of a LinkedList object?

java.util Package Questions & Answers

10. Which of these method of HashSet class is used to add elements to its object?

java.util Package Multiple Choice Questions & Answers

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java.util Package Questions

Online Test Name	java.util Package
Exam Type	Multiple Choice Questions
Category	Computer Science Engineering Quiz
Number of Questions	45

1. Which of these standard collection classes implements a dynamic array?

A. AbstractList
B. LinkedList
C. ArrayList
D. AbstractSet

Answer & Explanation

Answer: Option C

Explanation:

ArrayList class implements a dynamic array by extending AbstractList class.

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2. Which of these class can generate an array which can increase and decrease in size automatically?

A. ArrayList()
B. DynamicList()
C. LinkedList()
D. DynamicList()

Answer & Explanation

Answer: Option A

Explanation:

ArrayList()

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3. Which of these method can be used to increase the capacity of ArrayList object manually?

A. Capacity()
B. increaseCapacity()
C. increasecapacity()
D. ensureCapacity()

Answer & Explanation

Answer: Option D

Explanation:

When we add an element, the capacity of ArrayList object increases automatically, but we can increase it manually to specified length x by using function ensureCapacity(x)