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

Coding challenges

In the following 17 coding challenges, we will cover a number of problems involving maps and linked lists. Since linked lists are a more popular topic in technical interviews, we will allocate a higher number of problems to them. However, to master the concept of map data structures, especially built-in Java map implementations, I strongly recommend that you buy the book Java Coding Problems, which is also published by Packt Publishing (https://www.packtpub.com/programming/java-coding-problems). Besides being an awesome companion to this book, Java Coding Problems contains the following problems with maps (note that this is not a complete list):

  • Creating unmodifiable/immutable collections
  • Mapping a default value
  • Computing whether a value is absent/present in a Map
  • Removal from a Map
  • Replacing entries from a Map
  • Comparing two maps
  • Sorting a Map
  • Copying a HashMap
  • Merging two maps
  • Removing all the elements of a collection...