Java Coding Interview
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Java Coding Interview

Algorithms for Java Interview. 40 challenge codes!

About the Book

Increase your software development income by leveling up your problem-solving skills using algorithms and data structures. The more prepared and confident you are, the better the chances of negotiating your next salary!.

Why have a guide for interviews

Jobs in the tech industry are expected to grow exponentially in the next few years. If you plan to enter the job market soon, you must know that companies will evaluate your problem-solving skills based on data structures and algorithms, and you will need to face a complex problem on a blackboard.

That's the reason why Algorithms and Data structures are vital. You need this book because it includes the most common questions you can find in a real interview!.

By the end of reading this book, you'll be able to:

  • Understand the basics of common data structures and algorithms and apply them to real questions.
  • Apply clean code practices to develop a usable algorithm.
  • Understand the importance of text manipulation methods, lists, recursion, class design, queues, stacks, hashing, trees, graphs, and many more.
  • Develop a complete algorithm using the TDD approach, e.g., graph-based transport system, tic tac toe game.
  • React better than other candidates when faced with a new problem, e.g., design an algorithm to solve a problem you haven't seen before.
  • Understand and practice 40 code challenges explained step by step, including its pictorial representation.

About me

I am a software engineer who faced real interviews as candidates for startups and big companies. Throughout the years, I have sourced factual questions that have been tried, tested, and commented on step by step and are now part of this book!. I hope you find them practical and useful in your career search.

I usually write Tech articles at medium and

About the Author

Moises Gamio
Moises Gamio

Moises Gamio has been working for 20 years as a Software Engineer for several companies from different economic sectors such as Government, Financial, Industrial, Educative, Consulting, Retail, and Research.

He has been using several technological tools such as Java, C, Cobol, C#, Visual Basic, PHP, and JScript, in operating systems such as Windows, Linux, Unix, and RISC 6000, in databases such as SQL Server, Oracle, MySQL, DB2, and Lotus Notes. His tasks are related to Software Development, Stages of Analysis, Design, Testing, and Deployment.

For eight years, he worked as a System Analyst for the Bank Sector. Since 2014 he is working as a Software Engineer in a B2B company in Berlin, Germany.

Reader Testimonials


Development Tech Lead at EBRD

"A MUST read for any Java Developer! Succinct and super informative!. The author tries his best to keep the explanation as succinct as possible at the same time providing the code snippets and explanations including pictorial representation of problem-solutions!"

Henry Quinones
Henry Quinones

Business Development, Project Manager

This is an excellent source material for anyone looking to gain an advantage in landing that competitive job. I truly found the real life examples so helpful, that I recommended this book to my developer friends. Get an inside view!

Muy útil

Los ejemplos son muy exactos y bien definidos, los algoritmos van desde básicos hasta muy complejos y estan muy bien explicados por el autor.

Table of Contents

  • Inner workings of Data Structures
  • Big O Notation
  • Arrays and Strings
  • Linked Lists
  • Math and Logic Puzzles
  • Recursion
  • Sorting and Searching
  • Stacks and Queues
  • Hash Table
  • Trees and Graphs
  • Code Challenges

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