Foreign Function & Memory API (introduced in Java 16)

 Foreign Function & Memory API (introduced in Java 16)

The Foreign Function & Memory API provides a way to interact with native code and manage off-heap memory. It enables Java programs to call functions from native libraries and work with direct memory allocations. Here's a simplified example:

import jdk.incubator.foreign.*;

try (MemorySegment segment = MemorySegment.allocateNative(1024)) {

    segment.asByteBuffer().putInt(42); // Writing to native memory

    LibraryLookup lookup = LibraryLookup.ofDefault();

    FunctionDescriptor descriptor = FunctionDescriptor.of(CLinker.C_INT, CLinker.C_POINTER);

    MethodHandle function = lookup.lookup("myFunction", descriptor);

    int result = (int) function.invokeExact(segment.address()); // Calling native function

}