Book Image

The Complete Coding Interview Guide in Java

By : Anghel Leonard
Book Image

The Complete Coding Interview Guide in Java

By: Anghel Leonard

Overview of this book

Java is one of the most sought-after programming languages in the job market, but cracking the coding interview in this challenging economy might not be easy. This comprehensive guide will help you to tackle various challenges faced in a coding job interview and avoid common interview mistakes, and will ultimately guide you toward landing your job as a Java developer. This book contains two crucial elements of coding interviews - a brief section that will take you through non-technical interview questions, while the more comprehensive part covers over 200 coding interview problems along with their hands-on solutions. This book will help you to develop skills in data structures and algorithms, which technical interviewers look for in a candidate, by solving various problems based on these topics covering a wide range of concepts such as arrays, strings, maps, linked lists, sorting, and searching. You'll find out how to approach a coding interview problem in a structured way that produces faster results. Toward the final chapters, you'll learn to solve tricky questions about concurrency, functional programming, and system scalability. By the end of this book, you'll have learned how to solve Java coding problems commonly used in interviews, and will have developed the confidence to secure your Java-centric dream job.
Table of Contents (25 chapters)
1
Section 1: The Non-Technical Part of an Interview
7
Section 2: Concepts
12
Section 3: Algorithms and Data Structures
19
Section 4: Bonus – Concurrency and Functional Programming

Queues in a nutshell

A queue is a linear data structure that uses the First-In-First-Out (FIFO) principle. Think of people standing in a queue to buy stuff. You can also imagine ants that are walking in a queue formation.

So, technically speaking, the elements are removed from the queue in the same order that they are added. In a queue, the elements added at one end referred to as the rear (this operation is known as the enqueue operation) and removed from the other end referred to as the front (this operation is known as the dequeue or poll operation).

The common operations in a queue are as follows:

  • enqueue(E e): Adds an element to the rear of the queue
  • E dequeue(): Removes and returns the element from the front of the queue
  • E peek(): Returns (but doesn't remove) the element from the front of the queue
  • boolean isEmpty(): Returns true if the queue is empty
  • int size(): Returns the size of the queue
  • boolean isFull() : Returns true if the queue...