VectorAPIDemo.java

package java16.vector;

/**
 * Java 16 Vector API (Incubator)
 * Demonstrates SIMD-style vector computations
 * 
 * NOTE: This is an incubator feature and requires:
 * - --add-modules jdk.incubator.vector
 * - --enable-preview (if using preview features)
 * 
 * Compile: javac --add-modules jdk.incubator.vector --enable-preview --release 16 VectorAPIDemo.java
 * Run: java --add-modules jdk.incubator.vector --enable-preview VectorAPIDemo
 */
public class VectorAPIDemo {
    public static void main(String[] args) {
        System.out.println("=== Java 16 Vector API (Incubator) ===\n");
        
        // Note: Vector API requires specific hardware support (SIMD)
        // This example demonstrates the API structure
        
        System.out.println("Vector API provides SIMD-style operations for:");
        System.out.println("- Parallel processing of arrays");
        System.out.println("- Hardware-optimized computations");
        System.out.println("- Better performance for numerical operations");
        System.out.println("\nExample usage:");
        System.out.println("""
            import jdk.incubator.vector.*;
            
            // Define vector species (size)
            VectorSpecies<Float> SPECIES = FloatVector.SPECIES_PREFERRED;
            
            // Arrays to process
            float[] a = {1.0f, 2.0f, 3.0f, 4.0f};
            float[] b = {5.0f, 6.0f, 7.0f, 8.0f};
            float[] c = new float[4];
            
            // Load vectors from arrays
            FloatVector va = FloatVector.fromArray(SPECIES, a, 0);
            FloatVector vb = FloatVector.fromArray(SPECIES, b, 0);
            
            // Perform vector operation (add)
            FloatVector vc = va.add(vb);
            
            // Store result back to array
            vc.intoArray(c, 0);
            
            // Result: c = [6.0f, 8.0f, 10.0f, 12.0f]
            """);
        
        System.out.println("\nKey Features:");
        System.out.println("- Hardware-agnostic API");
        System.out.println("- Automatic optimization for supported hardware");
        System.out.println("- Type-safe operations");
        System.out.println("- Supports int, long, float, double vectors");
        
        System.out.println("\nUse Cases:");
        System.out.println("- Scientific computing");
        System.out.println("- Machine learning");
        System.out.println("- Image processing");
        System.out.println("- Signal processing");
        System.out.println("- Numerical simulations");
        
        System.out.println("\nBenefits:");
        System.out.println("- Better performance than scalar operations");
        System.out.println("- Parallel processing of multiple elements");
        System.out.println("- Hardware-optimized instructions");
        System.out.println("- Type-safe and platform-independent");
        
        System.out.println("\nNote: Vector API is still in incubator stage.");
        System.out.println("It may change in future Java versions.");
    }
}