This is the java programming questions and answers section on "collections" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
1. Which of these packages contain all the collection classes?
- A. java.lang
- B. java.util
- C. java.net
- D. java.awt
Answer: Option B
Explanation:
java.util
2. Which of these classes is not part of Java’s collection framework?
Answer: Option D
Explanation:
Queue is not a part of collection framework.
3. Which of these interface is not a part of Java’s collection framework?
- A. List
- B. Set
- C. SortedMap
- D. SortedList
Answer: Option D
Explanation:
SortedList is not a part of collection framework.
4. Which of these methods deletes all the elements from invoking collection?
- A. clear()
- B. reset()
- C. delete()
- D. refresh()
Answer: Option A
Explanation:
clear() method removes all the elements from invoking collection.
5. What is Collection in Java?
- A. A group of objects
- B. A group of classes
- C. A group of interfaces
- D. None of the mentioned
Answer: Option A
Explanation:
A collection is a group of objects, it is similar to String Template Library (STL) of C++ programming language.
