atomicinteger

The packagejava.concurrent.atomiccontains many useful classes to perform atomic operations. An operation is atomic when you can safely perform the operation in parallel on multiple threads without using the synchronizedkeyword or locks.

By using

AtomicInteger

as a replacement for

Integer

we're able to increment the number concurrently in a thread-safe manor without synchronizing the access to the variable. The method

incrementAndGet()

is an atomic operation so we can safely call this method from multiple threads.