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Title: Pattern matching in switch | java.evolved

Open Graph Title: Pattern matching in switch | java.evolved

X Title: Pattern matching in switch | java.evolved

Description: Replace if-else instanceof chains with clean switch type patterns.

Open Graph Description: Replace if-else instanceof chains with clean switch type patterns.

X Description: Replace if-else instanceof chains with clean switch type patterns.

Opengraph URL: https://javaevolved.github.io/language/pattern-matching-switch.html

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Domain: javaevolved.github.io

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Links:

java.evolvedhttps://javaevolved.github.io/
https://github.com/javaevolved/javaevolved.github.io
← All patternshttps://javaevolved.github.io/
←https://javaevolved.github.io/language/private-interface-methods.html
→https://javaevolved.github.io/language/guarded-patterns.html
Homehttps://javaevolved.github.io/
Languagehttps://javaevolved.github.io/#language
🐛 Report a code issuehttps://github.com/javaevolved/javaevolved.github.io/issues/new?template=code-issue.yml&title=%5BCode%20Issue%5D%20Pattern%20matching%20in%20switch&category=language&slug=pattern-matching-switch
🌐 Report a translation issuehttps://github.com/javaevolved/javaevolved.github.io/issues/new?template=translation-issue.yml&title=%5BTranslation%5D%20Pattern%20matching%20in%20switch%20%28English%29&locale=en&pattern=pattern-matching-switch&area=Pattern%20content
💡 Suggest a new patternhttps://github.com/javaevolved/javaevolved.github.io/issues/new?template=new-pattern.yml
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Let us know.https://github.com/javaevolved/javaevolved.github.io/issues/new?template=code-issue.yml&title=%5BCode%20Issue%5D%20Pattern%20matching%20in%20switch&category=language&slug=pattern-matching-switch
Pattern Matching for switch (JEP 441) ↗https://openjdk.org/jeps/441
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/language/PatternMatchingSwitch.java
Language Beginner Pattern matching for instanceof Java 8 if (obj instanceof String) { String s = (String) obj; int length = s.length(); // do something with 'length' } Java 16+ if (obj instanceof String s) { int length = s.length(); // do something with 'length' } Hover to see modern ➜ JDK 16+ → https://javaevolved.github.io/language/pattern-matching-instanceof.html
Language Beginner Unnamed variables with _ Java 8 try { parse(input); } catch (Exception ignored) { log("parse failed"); } map.forEach((key, value) -> { process(value); // key unused }); Java 22+ try { parse(input); } catch (Exception _) { log("parse failed"); } map.forEach((_, value) -> { process(value); }); Hover to see modern ➜ JDK 22+ → https://javaevolved.github.io/language/unnamed-variables.html
Language Beginner Records for data classes Java 8 public class Point { private final int x, y; public Point(int x, int y) { ... } public int getX() { return x; } public int getY() { return y; } // equals, hashCode, toString } Java 16+ public record Point(int x, int y) {} Hover to see modern ➜ JDK 16+ → https://javaevolved.github.io/language/records-for-data-classes.html
java.evolvedhttps://javaevolved.github.io/
Bruno Borgeshttps://github.com/brunoborges
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