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

Questions and coding challenges

In this section, we will cover 20 concurrency questions and coding challenges that are very popular in interviews.

You should be aware that Java concurrency is a wide and complex topic that needs to be covered in great detail by any Java developer. Having fundamental insights about Java concurrency should be enough to pass a general Java language interview, but it is not enough for specific interviews (for example, if you apply for a job that will imply developing a concurrency API, then you must deep dive into this topic and learn advanced concepts – most probably, the interview will be concurrency-centric).

Coding challenge 1 – Thread life cycle states

Problem: Enumerate and explain, in a few sentences, the states of a Java Thread.

Solution: The states of a Java thread are available via the Thread.State enumeration. The possible states of a Java thread can be seen in the following diagram:

16.2 –...