Java Best Practices for Efficient, Scalable, and Secure Code

Name: Java Best Practices for Efficient, Scalable, and Secure Code
Rating: 4.6 (206 reviews)

Tips and Tricks from OOP Foundations to Advanced Architecture Design Concepts - Guide for Developers, Architects, QAs

Highest Rated

Created byAndrii Piatakha

Last updated 4/2026

English

What you'll learn

Java Best Practices
Solid Foundation in OOP Principles
Application of SOLID Principles
Effective OOP Interview Preparation
Hands-On Exam on Object-Oriented Programming
Understanding Java Platform Module System (JPMS)
Comprehensive Testing Techniques for Java Platform
Adoption of TDD, BDD & ATDD Methodologies
Object-Oriented Architecture Design
The Best Clean Code Practices
Application of GoF Design Patterns
Preparation for Design Patterns Interviews
Stay Updated with Java New Versions
Effective Logging Practices in Java
Java Secure Coding Practices
Designing RESTful Architectures
Understanding Software Development Metrics and KPIs
Web Application Design Patterns

Coding Exercises

This course includes our updated coding exercises so you can practice your skills as you learn.

Course content

37 sections • 289 lectures • 89h 38m total length

Communication plan4:10
From this lecture you will learn:
• How to communicate during this course
• Where to ask questions
• How to ask questions
• Communication channels
Unlimited access to Learn-IT application for students3:16
From this lecture you will learn:
• Where to find good tests to verify your knowledge
• How to get unlimited access to Learn IT application (only for my students from Udemy)
Tips to Improve Your Course Taking Experience0:44
Additional Free Learning Materials to Use During the Course1:16
Learn IT Bot – Your Free AI Learning Assistant17:50
Why I Created This Bot
The Challenge: From Passive Learning to Real Mastery
The Solution – Learn IT Bot
Inside the Learn IT Bot – Key Features
Adaptive Difficulty & Endless Practice
Live Demo of the Learn IT AI Bot
Why It Matters – From Learning to Real-World Readiness
Free AI Bot for My Students Only – No Sign-Up, FREE, Just Practice1:50
In this lesson, I’ll show you how my students get exclusive, free, no sign-up access to a one-of-a-kind AI Bot I personally built to help you deeply learn the material, reinforce your knowledge, and gain a real advantage in interviews, real-world work and career growth.

Object-oriented programming: Basics14:15
From this lecture you will learn:
• What is OOP
• What is an object
• Class
• Why do we need OOP
• OOP advantages
• OOP VS Functional programming
• Inheritance
• Encapsulation
• Polymorphism
• Abstraction
Classes & Objects13:57
From this lecture you will learn:
• What does class consist of
• Fields
• Initialization blocks
• Constructors
• Methods
• Nested classes
• Getters and setters
• toString() method
• How to create object
Different types of Classes, Abstract keyword and Abstract classes10:16
From this lecture you will learn:
• Concrete classes
• Nested classes
• Final classes
• POJO classes
• Abstract classes
• Anonymous classes
• Abstract keyword
Interfaces12:03
From this lecture you will learn:
• What are interfaces
• What does interface consist of
• Abstract class VS Interface
• Interface VS Class VS Type

Inheritance10:45
From this lecture you will learn:
• What is inheritance
• ‘super’ keyword
• ‘instanceof’ operator
• How to extend classes
• Inheritance rules
Polymorphism and 'final' keyword9:18
From this lecture you will learn:
• What is polymorphism
• Method overriding
• Override VS Overload
• Dynamic binding
• ‘final’ keyword
'static' keyword7:08
From this lecture you will learn:
• What is ‘static’ keyword
• Where we can use ‘static’ keyword
• Static methods
• Static fields
• Static import
• Static VS dynamic binding
Encapsulation6:37
From this lecture you will learn:
• What is encapsulation
• Access modifiers
• Which modifiers to use and when
• Rules during overriding
Object, JNI and Object class overview9:35
From this lecture you will learn:
• What is an object
• Object class overview
• JNI
• ‘native’ keyword
• @Deprecated annotation
Quiz: Object-oriented programming - Check yourself0:49
The Quiz covers content from the following lessons:
Object-Oriented Programming: Basics
Classes & Objects
Different types of Classes, Abstract keyword and Abstract classes
Interfaces
Inheritance
Polymorphism
Static in Java - ‘static’ keyword
Encapsulation
Object, JNI and Object class overview

SOLID principles overview & Single Responsibility Principle7:28
From this lecture you will learn:
• What are SOLID principles
• SOLID principles in OOP
• Single responsibility principle
Open / Closed Principle7:28
From this lecture you will learn:
• Open / closed principle
• Code examples
Liskov Substitution Principle5:08
From this lecture you will learn:
• Liskov substitution principle
• Code examples
Interface Segregation Principle4:47
From this lecture you will learn:
• Interface segregation principle
• Code examples
Dependency Inversion Principle5:51
From this lecture you will learn:
• Dependency inversion principle
• Code examples
Quiz: SOLID Principles - Check yourself0:46
The Quiz covers content from the following lessons:
SOLID principles overview & Single Responsibility Principle
Open / Closed principle
Liskov substitution principle
Interface segregation principle
Dependency inversion principle

Introduction to GRASP17:46
What GRASP Is
Purpose of GRASP in OOP and Architecture
GRASP vs SOLID
GRASP vs Design Patterns
GRASP and UML
When GRASP Provides Maximum Value
Typical Misconceptions About GRASP
Summary and Lesson Transition
Information Expert20:11
Introduction to the Information Expert Principle
Core Idea: Assigning Responsibilities Based on Domain Data
Identifying True Experts in a Domain Model
Conflicts Between Information Expert and Low Coupling
Anti-Patterns: Fake Experts and Misused Data Classes
Practical Example: Applying the Information Expert Principle
Anti-Patterns demo
Information Expert in action demo
Creator24:43
Introduction to the Creator Principle
Rules for Assigning Object Creation Responsibility
Linking Creator with Information Expert
When to Avoid Creator (Factory vs Domain Rules)
Common Mistakes with Creator
Practical Example: Applying the Creator Principle
Anti-Patterns demo
Creator Principle in action demo
Controller27:12
Introduction to the Controller Principle
Types of Controllers: Façade Controller vs Use Case Controller
Mapping System Events to Controllers
Avoiding Bloated Controllers and the God Class Anti-Pattern
When Not to Use a Controller
Practical Example: Applying the Controller Principle
Low Coupling26:39
Introduction to Low Coupling
Techniques for Reducing Coupling
Coupling Metrics and Red Flags
Low Coupling vs Performance Trade-Offs
Relationship with Patterns: Adapter, Facade
Practical Example: Identifying and Reducing Coupling
High Cohesion27:29
Introduction to High Cohesion
Identifying Cohesive Responsibilities
Splitting Responsibilities in Feature Rich Classes
Cohesion Metrics: Understanding LCOM Basics
Anti-Patterns: Utility Classes and Swiss Army Knife Classes
Practical Example: Improving Cohesion in Real Code
Polymorphism27:05
Introduction to Polymorphism
When to Replace Conditionals with Polymorphism
Using Interfaces and Abstract Classes in GRASP
Linking Polymorphism with Strategy and State Patterns
Pitfalls of Polymorphism
Practical Example: Refactoring Conditionals into Polymorphism
Pure Fabrication22:27
Introduction to Pure Fabrication
When Domain Model Entities Should Not Take Responsibility
Service Objects, Repositories, Managers – Allowed or Not
Balancing Pure Fabrication vs Cohesion
Typical Mistake: Moving All Logic to Services
Practical Example: Applying Pure Fabrication Correctly
Indirection24:43
Introduction to Indirection
How Indirection Reduces Coupling
Common Use Cases for Indirection
Indirection in Event Bus, Mediator, and Controller Layers
When Indirection Becomes Too Much
Patterns That Rely on Indirection: Observer and Mediator
Practical Example: Applying Indirection in System Design
Protected Variations25:32
Introduction to Protected Variations
Identifying Unstable Points in a System
Protecting Variations with Interfaces and Abstractions
Adapters and Anti Corruption Layers
Aligning Protected Variations with Dependency Inversion
Real World Examples of Protected Variations by Domain
Practical Example: Protecting a System from Change
How GRASP Patterns Interact18:23
Introduction: Why GRASP Patterns Must Be Considered Together
Conflicts Between GRASP Patterns: Information Expert vs Low Coupling
Synergies Between GRASP Patterns: Polymorphism and Protected Variations
How the Controller Pattern Impacts Cohesion and Coupling
Understanding Trade offs Between Competing GRASP Principles
Choosing the Dominant Pattern in Design Decisions
Practical Guidelines for Balancing GRASP Patterns in Real Systems
GRASP in Architecture Layers19:35
Introduction: GRASP Across Architectural Layers
Applying GRASP in the Domain Layer
Applying GRASP in the Application Layer
Applying GRASP in the Infrastructure Layer
Where GRASP Does Not Apply
Common Misunderstandings When Applying GRASP by Layer
Practical Guidelines for Using GRASP in Layered Architectures
GRASP vs SOLID vs GoF15:57
Introduction: Why Compare GRASP, SOLID, and GoF
What Problems GRASP Solves
What Problems SOLID Solves
What Problems GoF Design Patterns Solve
Why GRASP Is Earlier and More Foundational
How GRASP Influences SOLID Principles
Mapping GRASP to SOLID and GoF Patterns

Clean Code Architecture, Coupling & Cohesion22:10
• What is a clean architecture
• What is a coupling
• Types of a coupling
• What is a cohesion
• Types of a cohesion
• Benefits of Clean Architecture
• Plugin concept
• Why do we need clean architecture
• Advantages and disadvantages of clean architecture
Tell, Don’t Ask Pricniple & Data Structures20:18
• Tell, don’t ask principle
• How to apply ‘Tell don’t ask’ in real life
• What is data structures
• Objects VS Data structures
• Getters and Setters in objects
• When to use data structures
Law of Demeter8:52
• What is Law of Demeter
• Goals
• Exception from law
• Pros & Cons
• Code Examples
KISS Principle in OOP26:21
KISS Principle - Definition
Variants of KISS in Software Development
Key Concepts of KISS
Why Use KISS Principle / Benefits
How to Apply KISS Principle
Case Studies of KISS Principle
Code Examples of KISS Principle
YAGNI Principle in OOP24:43
YAGNI Principle - Definition
Why Use YAGNI Principle / Benefits
How to Apply YAGNI
Case Studies of YAGNI Principle
Code Examples of YAGNI Principle
YAGNI Principle VS KISS Principle - Key Differences
DRY Principle in OOP | Part 118:32
DRY Principle - Definition
Why Use DRY Principle / Benefits
How to Apply DRY
Contrasting Concepts - WET & AHA
Case Studies of DRY Principle
DRY Principle in OOP | Part 2 - Practice11:51
Code Examples of DRY Principle
Packaging Pricniples p.1: Cohesion Principles21:29
• Problem statement
• Why do we need a good structure
• How to establish good code structure
• Factors to consider during the code grouping
• Cohesion Principles
• Common closure principle
• Common reuse principle
• Reuse-release equivalence principle
Packaging Pricniples p.2: Coupling Principles and Others24:55
• Coupling principles
• Acyclic dependencies principle
• Stable dependencies principle
• Stable abstractions principle
• Package by layer
• Package by feature
• Conway's law
• How technical factors impact code structure
• Tools for code analysis

GoF Patterns: Overview13:56
• Why do we need design patterns
• What are GoF patterns
• Key points of GoF patterns
• Creational Patterns: Overview
• Structural Patterns: Overview
• Behavioral Patterns: Overview
• Class & Object Patterns
• What patterns we are going to learn in this course
• Answers to most common questions of my students
Creational Patterns30:39
• Singleton
• Prototype
• Factory Method
• Builder
• Abstract Factory
• Factory Method VS Abstract Factory
Structural Patterns, p.131:07
• Proxy
• Decorator
• Adapter
• Façade
• Comparative Analysis
Structural Patterns, p.221:10
• Bridge
• Flyweight
• Composite
Behevioral Patterns, p.133:58
Strategy Pattern
Command Pattern
Strategy VS Command
Template Method
Iterator
Chain of responsibility
Behevioral Patterns, p.231:50
• Visitor
• Visitor VS Decorator
• State
• Observer
• Memento
Behevioral Patterns, p.320:52
• Interpreter
• Mediator

Requirements

Basic Java Knowledge: A fundamental understanding of Java programming is essential. Students should be familiar with Java syntax, data types, control structures, and basic concepts.
Programming Experience: Participants should have prior experience in writing Java code. Familiarity with coding practices and basic software development concepts is advantageous.
Development Environment Setup: Students should have a working Java development environment set up on their machines. This includes the Java Development Kit (JDK), Integrated Development Environment (IDE) like IntelliJ or Eclipse, and a version control system (e.g., Git).
Familiarity with Version Control: Some familiarity with version control systems, particularly Git, is recommended. This knowledge will aid in collaborative coding practices and project management.
Motivation for Best Practices: An eagerness to learn and apply best practices in Java development is crucial. The course emphasizes industry-standard approaches to writing efficient, maintainable, and secure code.

Description

Unlock the full potential of Java development with my comprehensive course on best practices. Whether you're a Java developer looking to elevate your coding skills, a Development Lead, an Architect, or a QA professional aiming to enhance testing efficiency. This course is your gateway to a higher level of Java expertise. It provides a deep dive into industry-proven techniques.

Key Learning Points:

Solid Foundation in OOP Principles:
- Master the fundamental concepts of OOP and discover their direct applications in Java development.
Application of SOLID Principles:
- Learn how to apply SOLID principles systematically, ensuring the creation of Java code that is robust, scalable, and easily maintainable.
Object-Oriented Architecture Design:
- Develop the skills needed to create scalable and maintainable Object-Oriented Architecture for Java applications, ensuring your projects stand the test of time.
Application of GoF Design Patterns:
- Understand and implement the renowned Gang of Four (GoF) design patterns, addressing common challenges encountered in software design.
Preparation for Design Patterns Interviews:
- Learn how to navigate design pattern-related problems commonly encountered in interviews, enhancing your problem-solving skills and interview performance.
Effective OOP Interview Preparation:
- Equip yourself with the knowledge and skills needed to confidently navigate OOP-related interview questions, enhancing your prospects in job interviews.
Hands-On Exam on Object-Oriented Programming:
- Demonstrate your practical proficiency in applying OOP principles through a comprehensive examination, solidifying your understanding of key concepts.
Understanding Java Platform Module System (JPMS):
- Explore the benefits of modularity in Java applications using the Java Platform Module System, gaining insights into creating modular and efficient codebases.
Comprehensive Testing Techniques:
- Master Unit Testing with JUnit, delve into Integration Testing, and learn to harness the power of Mockito and PowerMockito for effective and reliable testing.
Adoption of TDD, BDD & ATDD Methodologies:
- Gain practical experience in Test-Driven Development (TDD), Behavior-Driven Development (BDD), and Acceptance Test-Driven Development (ATDD), transforming your approach to software development.
Web Application Architecture:
- We are going to learn the best practices of web application development
Best Practices of REST Architecture Design in Java Applications:
- Architecture - that is something what is critically important from the very beginning.
Stay Updated with Java New Versions:
- Keep pace with the latest features and improvements in recent Java versions, ensuring you leverage the full potential of the language.
Effective Logging Practices in Java:
- Understand the critical role of logging in Java applications and learn best practices using frameworks like SLF4J and Logback.
Secure Coding Practices:
- Explore secure coding practices, addressing OWASP Top 10 security issues in Java applications, fortifying your code against potential vulnerabilities.
Designing RESTful Architectures:
- Master the principles of RESTful architecture and learn best practices for designing RESTful APIs in Java, ensuring efficient communication in modern software systems.
Understanding Software Development Metrics and KPIs:
- Gain insights into the importance of metrics and key performance indicators (KPIs) in software development. This knowledge enables informed decision-making and continuous improvement in your development processes.

Embark on this educational journey to become a proficient and well-rounded Java developer, QA professional, architect, or tech lead, armed with the latest industry best practices and techniques. Join us on a journey to master Java best practices and elevate your software development skills to new heights.

Who this course is for:

Java Developers: Intermediate and experienced Java developers looking to enhance their skills and adopt industry best practices in Java programming.
Java Enthusiasts and Students: Students and enthusiasts who want to build a strong foundation in Java programming and gain insights into industry-standard practices.
Technical Leads and Architects: Technical leads and architects aiming to reinforce their understanding of Java best practices for designing scalable and maintainable software architectures.
QA Engineers: QA professionals aiming to understand Java best practices to enhance the quality and efficiency of their testing efforts.
QA Automation Engineers: Individuals involved in QA automation who want to improve their Java programming skills and incorporate best practices into their automated testing frameworks.
QA Leads and Managers: QA leads and managers seeking insights into Java best practices to guide their teams in implementing effective and maintainable testing strategies.

Java Best Practices for Efficient, Scalable, and Secure Code

What you'll learn

Explore related topics

Coding Exercises

Course content

Introduction6 lectures • 29min

OOP Basics4 lectures • 51min

OOP Core Principles - Inheritance, Polymorphism, Encapsulation and Abstraction6 lectures • 44min

SOLID Principles6 lectures • 31min

PRACTICE: Coding exercises to practice SOLID principles0

GRASP Principles in OOP13 lectures • 4hr 58min

===== OOP: Interview Preparation =====3 lectures • 14min

Practice: EXAM OOP & Object-Oriented e-Commerce console applications1 lecture • 9min

Object-oriented Architecture, Clean Code Design (Advanced)9 lectures • 2hr 59min

GoF Design Patterns of Software Architecture in OOP7 lectures • 3hr 4min

Requirements

Description

Who this course is for: