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

Java functional-style programming in a nutshell

As usual, this section is meant to highlight and refresh the main concepts of our topic and to provide a comprehensive resource for answering the fundamental questions that may occur in a technical interview.

Key concepts of functional-style programming

So, the key concepts of functional programming include the following:

  • Functions as first-class objects
  • Pure functions
  • Higher-order functions

Let's briefly dive into each of these concepts.

Functions as first-class objects

Saying that functions are first-class objects means that we can create an instance of a function as having a variable referencing that function instance. This is like referencing a String, List, or any other object. Moreover, functions can be passed as parameters to other functions. However, Java methods are not first-class objects. The best we can do is to rely on Java lambda expressions.

Pure functions

A pure function...