The Java Collections Framework is the backbone of Java’s data storage and manipulation capabilities, offering developers a rich set of tools for managing collections of objects. This article, “Java Collections Framework MCQs,” delves into this essential Java topic, covering various collection classes like ArrayList, LinkedList, HashSet, and HashMap. It also explores the usage of iterators and the versatile foreach loop for efficient collection traversal.
Furthermore, this resource navigates through the core interfaces of the Java Collections Framework, such as List, Set, and Map, providing multiple-choice questions (MCQs) to bolster your understanding of this critical area of Java programming. Whether you’re preparing for interviews or seeking to enhance your proficiency in handling data structures, these MCQs offer a practical way to reinforce your knowledge of Java’s Collections Framework.
1.) Which data structure allows elements to be stored in a contiguous memory location?
2.) In terms of performance, which collection is generally faster for adding and removing elements at the beginning?
3.) Which data structure is more suitable for frequent insertions and deletions at both ends (beginning and end) of the collection?
4.) Which collection maintains the insertion order of elements?
5.) Which collection interface allows elements to be stored in an ordered sequence and provides positional access?
6.) What is the time complexity for accessing an element by index in an ArrayList?
7.) Which collection does not allow duplicate elements and does not maintain insertion order?
8.) Which interface in Java provides support for iterating over the elements of a collection in both forward and backward directions?
9.) What is the primary difference between a HashSet and a HashMap?
10.) In a HashMap, what is the purpose of the key?