Textbook in PDF format

Java Generics and Collections has been the go-to guide to generics for more than a decade. This second edition covers Java 21, providing a clear guide to generics from their most common uses to the strangest corner cases, giving you everything you need to know to use and write generic APIs effectively. It covers the collections library thoroughly, so you'll always know how and when to use each collection for any given task. And it explains stream processing, so you'll know which model to use and how they interoperate to get the best out of the platform library.
This indispensable guide covers
Fundamentals of generics: type parameters and generic methods
Subtyping and wildcards
Generics and reflection
Design patterns for generics
Sets, queues, lists, maps, and their implementations
Concurrent programming and thread safety with collections
Performance of different collection implementations
Best practices for using and extending the Java collections framework
Design philosophy and comparison with other collections libraries