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World Congress 2023 • Sep 21, 2023

Modern Java: This is not your father's Java anymore

Ron Veen

Think Java is just verbose legacy code? Discover how virtual threads, records, and pattern matching transform modern Java into a highly scalable, data-oriented powerhouse.

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#1 about 4 min

Using Java records as immutable lightweight data carriers

Defining immutable records reduces boilerplate code and prevents unintended data manipulation via reflection.

#2 about 3 min

Controlling object inheritance with sealed classes and interfaces

Specifying permitted subclasses enables fine-grained control over inheritance hierarchies and compiler exhaustiveness checks.

#3 about 1 min

Simplifying conditional logic using pattern matching predicates

Extracting flow-scoped pattern variables directly from predicate tests removes the need for explicit casting.

#4 about 2 min

Enhancing switch statements with exhaustive pattern matching

Treating objects as data through exhaustive compiler checks eliminates the need for default switch clauses.

#5 about 3 min

Deconstructing data structures with record pattern matching

Unpacking record variables directly within switch statements simplifies nested object extraction and improves readability.

#6 about 4 min

Scaling concurrent applications using lightweight virtual threads

Managing threads directly within the JVM allows unpooled execution of millions of blocking operations efficiently.

#7 about 2 min

Managing concurrent task lifecycles with structured concurrency

Defining specific shutdown policies for independent task branches coordinates exceptions and execution success automatically.

#8 about 2 min

Replacing globally mutable thread locals with scoped values

Providing immutable data exclusively to specific method scopes improves safety and debugging over legacy thread locals.

#9 about 2 min

Bootstrapping programs quickly with unnamed classes

Removing mandatory execution keywords and class wrappers lowers the barrier to entry for structural scripts.

#10 about 2 min

Ignoring unused parameters securely with unnamed variables

Assigning unused callback variables and generic exceptions to underscores clarifies intent and avoids inspection warnings.

#11 about 1 min

Accessing ordered list endpoints with sequence collections

Interacting with list endpoints via sequenced methods prevents index calculation errors on dynamic lists.

#12 about 2 min

Processing dynamic text inputs directly via string templates

Delegating text interpolation to processor interfaces mitigates syntax errors and formats complex queries safely.

#13 about 4 min

Implementing data-oriented programming architectures in Java

Combining immutable generic structures with exhaustive logic drives application flow purely through deterministic types.

Matching moments

3:16 min

Significant performance and language features launching in Java 21

Jonathan Vila · LIVE

2:30 min

Addressing verbosity and missing features in modern Java

Jonathan Vila · LIVE

1:47 min

Reviewing modern Java features from version 12 to 17

Ron Veen Ron Veen · WWC 2022

2:27 min

Summarizing the path forward for Java evolution

Michael Inden · LIVE

2:09 min

Overview of the Java features presentation

Michael Inden · LIVE

17:35 min

Major language and productivity upgrades from Java 12 to 17

Jonathan Vila · LIVE

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