Modern Java – A Guide to Java 8

Java 8 introduced a set of features that changed how developers could write everyday Java code. Modern Java – A Guide to Java 8 brings those changes together in a practical, example-led collection, moving from lambdas and functional interfaces to streams, concurrency, Nashorn, and more.

See Java 8 features in working examples 💻

The guide starts with core language changes, including default methods for interfaces, lambda expressions, method and constructor references, and the rules around variables captured by lambdas. Short code samples make the ideas concrete, showing how these features fit into familiar programming tasks.

Follow data through streams and functional APIs

Sections on predicates, functions, suppliers, consumers, Optional, and the Stream API explore how Java 8 supports functional-style programming. Stream topics include operations such as filtering, sorting, mapping, matching, counting, reducing, and parallel processing—useful concepts for understanding how to compose data-processing steps.

Beyond the language basics

The collection broadens its coverage with tutorials on Java 8 concurrency, including threads, executors, synchronization, locks, atomic variables, and ConcurrentMap. It also includes material on the Nashorn JavaScript engine, the Date API, annotations, and selected String, number, math, and file APIs.

A practical reference for Java learners

Rather than presenting Java 8 as a purely theoretical subject, this guide emphasizes readable code examples and focused explanations. It may suit Java programmers exploring the features introduced in Java 8, as well as learners who want a compact reference for specific APIs and techniques. The material is version-specific: its subject is Java 8 and the ecosystem of tutorials collected around it.