Mehra Lalit - Software Design Patterns for Java Developers

My beloved Parents

Shri Bhushan Mehra, Smt. Rekha Mehra

&

My Beautiful Wife

Lalit Mehra is a software engineer with a wide range of interests, covering topics such as microservices, distributed systems, scalability and asynchronous architecture. He has worked in multiple domains, including CRM, payments and finance. He earned his Master's Degree in Computer Science from Indraprastha University, Delhi, and has 10 years of experience working with some of the most prestigious organizations (such as Salesforce and Paytm).

His LinkedIn Profile: https://www.linkedin.com/in/mehralalit

Gaurav Aroraa is a Tech enthusiast and Technical consultant with more than 23 years of experience in the industry. He has a Doctorate in Computer Science. Gaurav is a Microsoft MVP award recipient. He is a lifetime member of the Computer Society of India (CSI), an advisory member and senior mentor at IndiaMentor, certified as a Scrum trainer and coach, ITIL-F certified, PRINCE-F and PRINCE-P certified. Gaurav is an open-source developer and contributor to the Microsoft TechNet community. He has authored ten books, including Microservices by Examples Using .NET Core (BPB Publications).

Your Blog links: http://gaurav-arora.com/blog/

Your LinkedIn Profile: https://www.linkedin.com/in/aroragaurav/

Amandeep has been working as an Engineering Manager in the field of software development at an Indian AI-based online travel company at the time of reviewing this book. He has worked for more than 9 years in multiple roles in different domains with some of the best organizations including top MNCs (such as RBS and Orange). He owns a wide horizon of interests in coding in Java and Python with an inclination towards solving business problems via software engineering. He has worked in numerous data science fields, especially Natural Language Processing. He has earned his Master's Degree with specialization in Data Analytics from the Birla Institute of Technology and Science, Pilani and has reviewed a few research papers under IEEE Transactions on Neural Networks and Learning Systems. He has earned certifications from multiple MOOCs on data science, machine learning, deep learning, image processing, natural language processing, artificial intelligence, algorithms, statistics, mathematics and related courses apart from his open-source contribution in Spark-NLP, Doccano and has hosted a library aiops on pypi.org.

There are a few people whom I want to thank for the continued and ongoing support they have given me during the writing of this book. First and foremost, I would like to thank my parents and my wife for continually encouraging me for writing the book I could have never completed this book without their support. My wife has been a continuous source of inspiration throughout the time I was involved with the book. She made sure I got enough time to work on the book after the office and took care of almost everything that needed my presence.

My gratitude also goes to the team at BPB Publications for being supportive and providing me enough time to complete the book. There are so many object-oriented design patterns that it becomes almost impossible to write about all of them in a single book. The team at BPB Publications trusted me to choose a selected few of them to write about in this book and I am very grateful for the confidence they have shown in me.

This book covers the three types of object-oriented design patterns, i.e., creational, structural and behavioral design patterns. The book has five sections, the first section has a single chapter dedicated to the whats and whys of the design patterns and their types. The other three sections have four chapters each and focus on these design patterns in a one chapter one pattern formation. The last section focuses on the design principles and anti-patterns.

In this book, we will discuss the basics of software design and some of the standard design patterns that are used across the globe in many different software applications. Almost every software application that is functional today uses one or more of these design patterns to accomplish variety of tasks they are built for.

This book focuses on some of the most used object-oriented design patterns and their implementation using Java. Each chapter in this book is dedicated to only one of the design patterns to ensure better readability and understanding. The individual chapters take the problem-oriented approach and discuss the design problem that could be solved by utilizing the design pattern discussed in that chapter. The chapters emphasize on understanding the core of these design patterns and provide close to real life examples to directly connect the reader with the scenarios where these design patterns can be utilized.

This book will benefit those who have a fair understanding of software development and are familiar working with medium to large scale systems. The concepts mentioned in the book will add to the knowledge of those who work with multiple module systems and is also a go to guide for those who want to improve their software design understanding.

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Code Bundle and the Coloured Images of the book: