java-pattern-switch

Use when Java 21+ `switch` uses type patterns, `null`, guards, sealed exhaustiveness, or pattern dominance.

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Use when Java 21+ `switch` uses type patterns, `null`, guards, sealed exhaustiveness, or pattern dominance.

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What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

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~/.claude/skills/java-pattern-switch

What's inside

Skill name: java-pattern-switch
Description: Use when Java 21+ `switch` uses type patterns, `null`, guards, sealed exhaustiveness, or pattern dominance.
License: MIT
Compatibility: JDK 21+
Instructions: 26 lines in SKILL.md · view on GitHub

Files (2)

SKILL.md
jep-441.md · examples/

SKILL.md (first lines)

# Pattern Matching for switch

Use for **Pattern Matching for switch** work from [JEP 441](https://openjdk.org/jeps/441) when targeting JDK 21+.

## When active

- Refactor `instanceof`/cast chains into pattern switches.
- Handle `case null` explicitly when needed.
- Use sealed hierarchies and record patterns for exhaustive switches.

## Pitfalls

- Pattern labels are tested in source order; dominated labels are compile-time errors.
- `default` does not match `null`.
- Put narrow cases before broad cases such as `Object`.

## Examples

Read `examples/jep-441.md` for JEP-derived snippets.

## References

- https://openjdk.org/jeps/441
- https://openjdk.org/jeps/440

From isp-insoft-gmbh/isp-insoft-ai-skills, MIT.

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Last commit (this folder): Sep 7, 2026 (1 month ago)

From GitHub (fetched Oct 24, 2026).

Details

License: MIT
Repository: github.com/isp-insoft-gmbh/isp-insoft-ai-skills
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: GitHub github-graphql

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java-pattern-switch skill. Agent Mart. https://agentmart.dev/skills/isp-insoft-gmbh-java-pattern-switch (last updated 2026-10-24)