261 - Effective Pattern Matching in Java plus Bonus Talk

Talk 1: Effective Pattern Matching in Java

Since Java 14, the Java switch and instanceof statements have been enhanced, in multiple phases, to support pattern matching and a "data-oriented" programming style.

 In this presentation, Cay explores when this programming style is beneficial, and why. (Spoiler: Not as often as one might think from Oracle's presentations, but when it does apply, it is truly useful.) 

Cay describes the syntax of pattern matching, as it has evolved, and shows how it will be further enhanced in upcoming versions of Java. He warns of corner cases of the switch syntax where modern usage clashes with legacy behavior. 

The talk concludes with a set of rules when to use pattern matching and "data orientation" now, how to prepare for future enhancements, and when to stay away.

Cay's talk is being streamed as part of the annual JChampions Conference taking place between Jan 22nd and Jan 27th - see the full four day schedule.

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Talk 2: Virtual Threads, Structured Concurrency, Extent Locals: When to Use Them, and How.

Project Loom introduces a lightweight threading model to the Java platform.

At first, the blogosphere erupted in displays of denial. Why do we need something new when threads and reactive programming have served us well? The next stage was anger. People tried to use virtual threads with use cases for which they were definitely not designed, and were upset that the results were bad.

The purpose of this talk is to help the audience skip the next two stages of grief and skip ahead to acceptance. Cay will analyse typical concurrent programming tasks and show how to assess their Loom-friendliness. He will dig into the new concepts of structured concurrency and extent locals and give examples of when to use them, and when to stick with existing practice.

As a result, attendees should be able to walk away with a more nuanced understanding of when and how to employ virtual threads in their systems.

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About Cay Horstmann

Author of Core Java, Scala for the Impatient, and many other books.

After growing up in the German countryside, Cay studied in the United States (M.S. in computer science from Syracuse University, and a Ph.D. in mathematics from the University of Michigan in Ann Arbor).

For four years, he was VP and CTO of an Internet start-up that went from 3 people in a tiny office to a public company. He taught computer science at San Jose State University and held visiting appointments at universities in Germany, Switzerland, Vietnam, and Macau.

In his copious spare time Cay writes books and articles on programming languages and computer science education.

Find him on Linkedin or horstmann.com/unblog

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About the Dublin Java User Group

Since 2006, the Dublin Java User Group, aka DubJUG, has been working with the global Java community to amplify technical knowledge for the benefit of Irish based developers and businesses. It is a resident member of Dublin's TechMeetup.space. 

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