AloisSeckar/demos-java

JEP 530 – Primitive Types in Patterns, instanceof, and switch (Fourth Preview)

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#364 opened on Apr 8, 2026

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Description

The current implementation is in JEP 507.

The recent https://openjdk.org/jeps/530 need new JEP 530 demo implementation and JEP 507 should be turned into a linking class pointing to JEP 530.

NOTE: This is an ADVANCED task to help with. Be sure you understand the requirements. Check previous contributions with advanced label and ask if you have any questions or doubts before doing work that will not be helpful.

Contributor guide

Research direction
Study JEP 530 specification and examples. Understand the previous JEP 507 implementation. Create a new demo class for JEP 530 features (primitive types in patterns, instanceof, switch). Convert JEP 507 to a linking class that references JEP 530 demo.
Tech stack
java
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaGitUnderstanding of Java JEPs
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20