Java Interview Guide : 200+ Interview Questions and Answers - Collection Interface Hierarchy

The video tutorial discusses the importance of collections in Java, highlighting the limitations of arrays and the need for dynamic data structures. It explores key interfaces in the collection hierarchy, such as Set, List, Queue, and Map, explaining their unique characteristics and use cases. The tutorial emphasizes the role of interfaces in defining operations and constraints for implementations.

Why are collections needed in Java?

• To enhance the speed of Java programs

• To provide a dynamic data structure

• To replace primitive data types

• To simplify syntax

What is the primary focus when understanding collections in Java?

• Studying Java's history

• Understanding interfaces and classes

• Learning about Java syntax

• Exploring Java's graphical capabilities

Which interface allows only unique elements?

• List

• Map

• Queue

• Set

What is a key characteristic of the List interface?

• It processes elements in a FIFO order

• It does not allow duplicate elements

• It stores elements in key-value pairs

• It allows duplicate elements

What is the primary use of the Queue interface?

• To store elements in key-value pairs

• To allow duplicate elements

• To ensure unique elements

• To process elements in a specific order

How does the Map interface differ from other collection interfaces?

• It extends the Collection interface

• It does not extend the Collection interface

• It is used for sorting elements

• It allows duplicate keys

What does the Map interface primarily store?

• Unique elements

• Ordered elements

• Key-value pairs

• Graphical data