Lemkoleg,


Все что связано с атомик

https://docs.oracle.com/javase/tutorial/essential/concurrency/atomicvars.html


https://docs.oracle.com/javase/8/docs/api/index.html?java/util/concurrent/atomic/package-summary.html
Package java.util.concurrent.atomic

AtomicBoolean
A boolean value that may be updated atomically.
AtomicInteger
An int value that may be updated atomically.
AtomicIntegerArray
An int array in which elements may be updated atomically.
AtomicIntegerFieldUpdater<T>
A reflection-based utility that enables atomic updates to designated volatile int fields of designated classes.
AtomicLong
A long value that may be updated atomically.
AtomicLongArray
A long array in which elements may be updated atomically.
AtomicLongFieldUpdater<T>
A reflection-based utility that enables atomic updates to designated volatile long fields of designated classes.
AtomicMarkableReference<V>
An AtomicMarkableReference maintains an object reference along with a mark bit, that can be updated atomically.
AtomicReference<V>
An object reference that may be updated atomically.
AtomicReferenceArray<E>
An array of object references in which elements may be updated atomically.
AtomicReferenceFieldUpdater<T,V>
A reflection-based utility that enables atomic updates to designated volatile reference fields of designated classes.
AtomicStampedReference<V>
An AtomicStampedReference maintains an object reference along with an integer "stamp", that can be updated atomically.
DoubleAccumulator
One or more variables that together maintain a running double value updated using a supplied function.
DoubleAdder
One or more variables that together maintain an initially zero double sum.
LongAccumulator
One or more variables that together maintain a running long value updated using a supplied function.
LongAdder
One or more variables that together maintain an initially zero long sum.

Вообще чаще всего народ юзает хешмеп для этих целей
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html