What are atomic classes in Java Concurrency API?

The java.util.concurrent. atomic package defines classes that support atomic operations on single variables. All classes have get and set methods to read and write similar to volatile variables.

import java.util.concurrent.atomic.AtomicInteger;

public class AtomicCounter {
    private AtomicInteger i= new AtomicInteger(0);

    public void increment() {
        i.incrementAndGet();
    }

    public void decrement() {
        i.decrementAndGet();
    }

    public int value() {
        return i.get();
    }

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