AtomicLong

AtomicLong is a class in Java that provides a long value that may be updated atomically. It is part of the java.util.concurrent.atomic package. An AtomicLong is used to manage a long value that can be updated from multiple threads. The class provides methods to atomically update the value, which ensures that the value is updated in a thread-safe manner, without the need for explicit synchronization or locking.

For example, if multiple threads want to increment a counter concurrently, they can use an AtomicLong to ensure that the updates are made atomically, without any risk of race conditions or other synchronization issues.

Some of the commonly used methods in the AtomicLong class include `get()`, `set()`, `getAndSet()`, `compareAndSet()`, `getAndIncrement()`, `getAndDecrement()`, `incrementAndGet()`, and `decrementAndGet()`.