How does AutoCloseable behave in multithreaded code?

In Java, the AutoCloseable interface plays a crucial role in resource management, particularly in multithreaded contexts. When a thread acquires a resource that implements AutoCloseable, it is essential to ensure that the resource is closed properly even if an exception occurs. This becomes even more critical in multithreaded applications, where multiple threads might access the same resource concurrently. Each thread must handle the closing of resources independently to prevent memory leaks or resource contention.

When using AutoCloseable in a multithreaded environment, the common practice is to utilize try-with-resources statements. However, care must be taken to avoid scenarios where one thread might close a resource that another thread is still using. This can lead to unpredictable behavior and exceptions if not managed correctly. Therefore, synchronization techniques or thread-local resources are often recommended to ensure that resources are only closed once they are no longer in use.