Java Interview Guide : 200+ Interview Questions and Answers - Collections & List Interface methods and classes - ArrayLi

The video tutorial covers the collection interface in Java, detailing its methods and the hierarchy of interfaces that extend it, such as Set, List, and Queue. It then delves into the List interface, highlighting its unique methods related to indexing and maintaining insertion order. The tutorial compares ArrayList and Vector, focusing on their performance and thread safety. Finally, it discusses LinkedList, its characteristics, and its suitability for implementing stacks and queues.

Which of the following interfaces extends the Collection interface?

• Map

• Set

• Iterator

• Comparator

What additional functionality does the List interface provide over the Collection interface?

• Sorting elements

• Index-based access

• Concurrent modification

• Thread safety

What is a key characteristic of the List interface regarding element order?

• Elements are stored randomly

• Elements maintain insertion order

• Elements are stored in reverse order

• Elements are sorted alphabetically

Why is the access time in an ArrayList fast?

• It caches elements

• It uses an array as the underlying data structure

• It uses a linked list structure

• It is synchronized

What is a major difference between ArrayList and Vector?

• ArrayList is synchronized, Vector is not

• Vector is synchronized, ArrayList is not

• ArrayList is faster than Vector in all operations

• Vector does not implement the List interface

What makes LinkedList suitable for implementing a stack or a queue?

• It maintains insertion order

• It uses an array as the underlying structure

• It is synchronized

• It allows fast insertion and deletion

How are elements linked in a LinkedList?

• They are linked in a circular manner

• They are linked in a single direction

• They are doubly linked forward and backward

• They are not linked at all