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Title: Calling out to C code from Java | java.evolved

Open Graph Title: Calling out to C code from Java | java.evolved

X Title: Calling out to C code from Java | java.evolved

Description: FFM lets Java call C libraries directly, without JNI boilerplate or C-side Java knowledge.

Open Graph Description: FFM lets Java call C libraries directly, without JNI boilerplate or C-side Java knowledge.

X Description: FFM lets Java call C libraries directly, without JNI boilerplate or C-side Java knowledge.

Opengraph URL: https://javaevolved.github.io/language/call-c-from-java.html

direct link

Domain: javaevolved.github.io

Hey, it has json ld scripts: 
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JEP 454: Foreign Function & Memory API ↗https://openjdk.org/jeps/454
java.lang.foreign package (Java 22) ↗https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/lang/foreign/package-summary.html
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/language/CallCFromJava.java
I/O Advanced File memory mapping Java 8 try (FileChannel channel = FileChannel.open(path, StandardOpenOption.READ, StandardOpenOption.WRITE)) { MappedByteBuffer buffer = channel.map( FileChannel.MapMode.READ_WRITE, 0, (int) channel.size()); // Limited to 2GB // Freed by GC, no control } Java 22+ FileChannel channel = FileChannel.open(path, StandardOpenOption.READ, StandardOpenOption.WRITE); try (Arena arena = Arena.ofShared()) { MemorySegment segment = channel.map( FileChannel.MapMode.READ_WRITE, 0, channel.size(), arena); // No size limit // ... } // Deterministic cleanup Hover to see modern ➜ JDK 22+ → https://javaevolved.github.io/io/file-memory-mapping.html
Language Beginner Compact source files Java 8 public class HelloWorld { public static void main(String[] args) { System.out.println( "Hello, World!"); } } Java 25 void main() { IO.println("Hello, World!"); } Hover to see modern ➜ JDK 25+ → https://javaevolved.github.io/language/compact-source-files.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
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