Create: 2025-05-26 Update: 2025-07-02 22:10:28

☕ JEP 512: Поддержка структурированных массивов в Java

Java готовится к мощному обновлению — структурированные массивы (structured arrays) придут в язык и улучшат работу с плотными, кэш-эффективными структурами данных!

🧬 Что такое структурированные массивы?

Это массивы, где данные объектов хранятся не как ссылки, а в смежной памяти, как в `C`/`C++`/Rust. Это позволяет:
• 📦 Упаковать данные компактно, без разрывов
• 🚀 Повысить кэш-локальность и производительность
• 🔬 Избежать лишних аллокаций и GC overhead

🔧 Пример:


value class Vec3 {
    float x, y, z;
}

Vec3[] arr = new Vec3[1000];  // Под капотом — плотно упакованный блок памяти!

📈 Зачем это нужно?

✅ Быстрее в high-performance системах (игры, машинное обучение, базы данных)
✅ Простой способ писать "низкоуровневый" код на Java без перехода на JNI
✅ Поддержка value-классов (Project Valhalla) на новом уровне

📅 Статус и планы:

JEP 512 пока в статусе "Proposed to Target" для Java 23. Это часть большого проекта Valhalla, направленного на улучшение модели памяти и данных в JVM.

💬 Впереди Java с реальными структурами, а не объектами-ссылками. Оптимизация данных выходит на новый уровень!

📖 Подробнее: https://openjdk.org/jeps/512

@javatg

Java


value class Vec3 {
    float x, y, z;
}

Vec3[] arr = new Vec3[1000];  // Под капотом — плотно упакованный блок памяти!

hottg.com/javatg/1853

4.1K viewsedited May 26 at 08:38

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☕ JEP 512: Поддержка структурированных массивов в Java

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