JDK16新特性

public class InstanceOfPatternMatching {
    public static void printAnimalType(Object obj) {
        if (obj instanceof Cat cat) {
            System.out.println("This is a cat named " + cat.getName());
        } else if (obj instanceof Dog dog) {
            System.out.println("This is a dog named " + dog.getName());
        }
    }

    public static void main(String[] args) {
        printAnimalType(new Cat("Whiskers"));
        printAnimalType(new Dog("Rex"));
    }
}

class Animal {}
class Cat extends Animal {
    private String name;
    public Cat(String name) { this.name = name; }
    public String getName() { return name; }
}
class Dog extends Animal {
    private String name;
    public Dog(String name) { this.name = name; }
    public String getName() { return name; }
}

record Person(String name, int age) {}

public class RecordsDemo {
    public static void main(String[] args) {
        Person person = new Person("Alice", 30);
        System.out.println(person);
    }
}

import jdk.incubator.foreign.MemorySegment;

public class ForeignMemoryDemo {
    public static void main(String[] args) {
        MemorySegment segment = MemorySegment.allocateNative(1024); // 分配1KB内存
        segment.set(JAVA_BYTE, 0, (byte)42); // 写入字节
        byte value = segment.get(JAVA_BYTE, 0); // 读取字节
        System.out.println("Value at offset 0: " + value);
    }
}

import jdk.incubator.vector.FloatVector;

public class VectorAPIDemo {
    public static void main(String[] args) {
        FloatVector vectorA = FloatVector.fromArray(FloatVector.SPECIES_256, new float[]{1f, 2f, 3f, 4f}, 0);
        FloatVector vectorB = FloatVector.fromArray(FloatVector.SPECIES_256, new float[]{5f, 6f, 7f, 8f}, 0);
        FloatVector result = vectorA.add(vectorB);
        result.intoArray(new float[4], 0);
        // 打印结果
    }
}