EXFO Applications Engineer Interview Questions and Answers

A data structure is a way of organizing and storing data in a computer so that it can be accessed and modified efficiently.

• Data structures define the way data is stored, accessed, and manipulated in a computer program.

• Examples include arrays, linked lists, stacks, queues, trees, and graphs.

• Choosing the right data structure is crucial for optimizing the performance of algorithms and applications.

A linked list is a data structure where each element is connected to the next element through pointers.

• Consists of nodes where each node contains data and a reference to the next node

• Can easily insert or delete elements without shifting other elements

• Examples: singly linked list, doubly linked list, circular linked list

HashSet is a collection that does not allow duplicate elements and does not guarantee the order of elements.

• HashSet implements the Set interface in Java.

• It uses a hash table for storage.

• Example: HashSet set = new HashSet<>();

Recursion is a programming technique where a function calls itself in order to solve a problem.

• Recursion involves breaking down a problem into smaller subproblems and solving them recursively.

• A base case is needed to stop the recursion and prevent infinite loops.

• Recursion can be used to solve problems like factorial calculation, Fibonacci sequence, and tree traversal.

A static constructor is a special type of constructor in a class that is used to initialize static data members.

• Static constructors are called only once when the class is first accessed.

• They are used to initialize static variables or perform any necessary setup for the class.

• Static constructors do not take any parameters and cannot be called explicitly.

• Example: public class MyClass { static MyClass() { // initializatio