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Title: Default interface methods | java.evolved

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Description: Add method implementations directly in interfaces, enabling multiple inheritance of behavior.

Open Graph Description: Add method implementations directly in interfaces, enabling multiple inheritance of behavior.

X Description: Add method implementations directly in interfaces, enabling multiple inheritance of behavior.

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Evolving Interfaces (dev.java) ↗https://dev.java/learn/interfaces/examples/
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/language/DefaultInterfaceMethods.java
Language Intermediate Private interface methods Java 8 interface Logger { default void logInfo(String msg) { System.out.println( "[INFO] " + timestamp() + msg); } default void logWarn(String msg) { System.out.println( "[WARN] " + timestamp() + msg); } } Java 9+ interface Logger { private String format(String lvl, String msg) { return "[" + lvl + "] " + timestamp() + msg; } default void logInfo(String msg) { IO.println(format("INFO", msg)); } default void logWarn(String msg) { IO.println(format("WARN", msg)); } } Hover to see modern ➜ JDK 9+ → https://javaevolved.github.io/language/private-interface-methods.html
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 Intermediate Sealed classes for type hierarchies Java 8 // Anyone can extend Shape public abstract class Shape { } public class Circle extends Shape { } public class Rect extends Shape { } // unknown subclasses possible Java 17+ public sealed interface Shape permits Circle, Rect {} public record Circle(double r) implements Shape {} public record Rect(double w, double h) implements Shape {} Hover to see modern ➜ JDK 17+ → https://javaevolved.github.io/language/sealed-classes.html
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