Библиотека собеса по Java | вопросы с собеседований

❓ Гарантирует ли ConcurrentHashMap видимость между потоками? Нужно ли дополнительно синхронизировать put() и get() для корректной работы?

ConcurrentHashMap уже обеспечивает необходимую памятную видимость (happens-before) между put() и get() — дополнительная синхронизация не нужна.

Если put() завершился до начала get(), то get() обязательно увидит вставленное значение. Это гарантируется внутренней реализацией: через volatile поля, CAS-операции и memory barriers.

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Библиотека собеса по Java

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Create: 2025-04-14
Last Update: 2025-06-25 11:51:03

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