CF

Java Generics

1h 8m 39s
English
Paid
Updated September 2026

Java Generics is a 16-lesson 1 hour 8 minutes self-paced course by Nelson Djalo (Amigoscode). Generics exist in Java to eliminate a specific, longstanding headache: unsafe casting that quietly caused ClassCastExceptions at runtime instead of compile time.

Course facts

Lessons
16
Duration
1 hour 8 minutes
Level
All levels
Language
English
Updated
2026-09-11
Instructor
Nelson Djalo (Amigoscode)
Price
Premium

Generics exist in Java to eliminate a specific, longstanding headache: unsafe casting that quietly caused ClassCastExceptions at runtime instead of compile time. This course is about actually understanding how and why generics solve that, not just memorizing the angle-bracket syntax.

What you'll learn

  • How generics let one method or class work safely across multiple types
  • Generic methods, and how they work independently of whether their containing class is generic
  • Bounded type parameters, for restricting which types are valid arguments
  • Wildcards — unbounded, extends, and super — and when each one applies
  • Where generics show up in practice: the Collections Framework, API design, and custom data structures

16 lessons focused on writing cleaner, more reusable, and genuinely type-safe Java APIs, with companion code available on GitHub.

Additional

https://github.com/amigoscode/java-generics

Who teaches Java Generics? Nelson Djalo (Amigoscode)

Nelson Djalo (Amigoscode) thumbnail

Nelson Djalo publishes the Amigoscode YouTube channel and standalone course platform — one of the largest independent Java / Spring Boot tutorial sources online, with several million subscribers and a multi-year track record of weekly back-end engineering tutorials.

The course catalog covers the full Java back-end stack: Java fundamentals, Spring Boot for production web services, Spring Security and OAuth, Spring Data and JPA, microservices patterns with Spring Cloud, Kafka and event-driven architecture, Docker and Kubernetes for the deployment layer, AWS for cloud infrastructure, and the database side (PostgreSQL, MongoDB, Redis). Material is project-oriented — most courses build a working microservice or full application end-to-end.

The CourseFlix listing under this source carries over 13 Amigoscode courses spanning that range. Material is paid; Amigoscode runs on per-course or membership pricing on the original platform. Courses are aimed at Java developers building production back-end services.

What lessons are included in Java Generics?

This is a demo lesson (10:00 remaining)

You can watch up to 10 minutes for free. Subscribe to unlock all 16 lessons in this course and access 10,000+ hours of premium content across all courses.

View Pricing
0:00
/
#1: Quick words
All Course Lessons (16)
#Lesson TitleDurationAccess
1
Quick words Demo
01:26
2
Understanding ClassCastExeption
04:25
3
ClassCastException Example 2
02:31
4
Type Parameter and Type Argument
06:08
5
Generic Type Naming Convention
02:25
6
Generic and Classes
03:45
7
Generic and Classes Part 2
06:10
8
Generics and Methods
08:28
9
Bounded Type Parameters
09:06
10
Multiple Bounds
04:24
11
Unbounded Wildcard
05:06
12
Upper Bounded Wildcards
03:31
13
Lower Bounded Wildcards
03:42
14
Difference Between Bounded Type Parameters and Wildcards
03:23
15
Type Erasure
02:44
16
Wrap Up
01:25
Unlock unlimited learning

Get instant access to all 15 lessons in this course, plus thousands of other premium courses. One subscription, unlimited knowledge.

Learn more about subscription

What courses are similar to Java Generics?

More courses by Nelson Djalo (Amigoscode)

Frequently asked questions

What prerequisites should I have before enrolling in this course?
Before enrolling in this course, you should have a solid understanding of Java programming, including familiarity with basic object-oriented principles. Knowledge of Java collections and previous experience handling exceptions, such as ClassCastException, will also be beneficial as the course addresses eliminating such exceptions through Java Generics.
What kind of projects or exercises will I work on in this course?
The course includes practical exercises such as understanding and resolving ClassCastException scenarios, applying generic types and methods, and implementing bounded and unbounded wildcards. These exercises aim to enhance your ability to create type-safe and reusable APIs using Java Generics.
Who is the target audience for this course?
The target audience for this course includes Java software engineers who want to improve their understanding of writing generic algorithms. Developers looking to enhance their skills in creating clean, reusable APIs will also find this course particularly useful.
How does the scope of this course compare to other Java courses?
This course specifically focuses on Java Generics, providing detailed insights into type safety, code reusability, and readability. It covers key topics like generic methods, bounded type parameters, and wildcards, distinguishing it from more general Java programming courses that may not delve deeply into these advanced topics.
What specific tools or platforms will I learn about in this course?
The course does not focus on external tools or platforms but instead emphasizes Java language features, specifically Java Generics. You will learn about using generic types, methods, and wildcards to enhance your code's safety and flexibility directly within the Java programming environment.
What topics are not covered in this course?
This course does not cover introductory Java programming or general object-oriented programming concepts. It assumes participants have a foundational understanding and instead focuses on the advanced topic of Java Generics, including type parameters and wildcards.
How can the skills from this course be applied in other areas or careers?
The skills learned from this course are highly applicable in software development roles that require robust and maintainable code. Understanding Java Generics can aid in creating efficient APIs and libraries, making it valuable for positions involving backend development, API design, and any role requiring advanced Java programming skills.