How do you use Panama MemorySegment/Linker with a simple code example?

Using Panama MemorySegment and Linker in Java

Java's Project Panama introduces new capabilities for working with native code. MemorySegment and Linker allow Java applications to interact with native libraries efficiently. Below is a simple code example demonstrating how to use these features.

// Example of using MemorySegment and Linker in Java import jdk.incubator.foreign.*; public class MemorySegmentExample { public static void main(String[] args) { // Allocate a MemorySegment MemorySegment segment = MemorySegment.allocateNative(4); segment.set(ValueLayout.JAVA_INT, 0, 42); // Load a native library Linker linker = Linker.nativeLinker(); MemoryAddress address = linker.lookup("myNativeFunction").orElseThrow(); // Call the native function (assumed to be a C function) int result = (int) linker.downcall(address, ValueLayout.JAVA_INT, segment); System.out.println("Result from native function: " + result); // Clean up segment.close(); } }

Java Panama MemorySegment Linker native libraries JNI Project Panama

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