What components do atomic classes consist of and how are they implemented?

Atomic classes in Java are designed to provide atomic (indivisible) operations on primitive data types in a multithreaded environment without using locks.

Main components of atomic classes:

• Internal value — usually a primitive type (int, long, boolean, etc.) stored in a special field.
• Methods of atomic operations — such as get(), set(), compareAndSet(), getAndIncrement(), and others that ensure safe modification of the value.
• Use of low-level synchronization primitives — for example, CAS (Compare-And-Swap) operations, implemented via Unsafe or VarHandle.

Example of using AtomicInteger:

import java.util.concurrent.atomic.AtomicInteger;

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

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

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

Thus, atomic classes allow avoiding explicit synchronization and locks, providing high performance and safety in a multithreaded environment.