What ensures the atomicity of classes marked as Atomic?

In Android, the @Atomic annotation is not a standard one, but if we talk about atomicity in the context of classes or variables, it usually relates to ensuring atomic operations — operations that are completed fully or not at all, without intermediate states.

If a class is marked as Atomic (for example, in some libraries or custom implementations), it may mean that its methods provide thread safety and operations on its state are not interrupted by other threads.

An example of an atomic operation using the AtomicInteger class from Java:

import java.util.concurrent.atomic.AtomicInteger;

public class Counter {
    private AtomicInteger count = new AtomicInteger(0);

    public void increment() {
        count.incrementAndGet(); // atomic increment
    }

    public int getCount() {
        return count.get();
    }
}

Thus, atomicity ensures correct operation in a multithreaded environment without the need for heavy locking.