JDK-8273914 bug demo.

Disturbed.java

/**
 * Sample from https://habr.com/ru/post/581576/ article.
 */
import java.util.concurrent.atomic.AtomicInteger;

public class Disturbed {

    public static void main(String... args) {
        AtomicInteger counter = new AtomicInteger(1);
        System.out.println(
            "First two positive numbers: " +
            counter + 
            ", " +
            counter.incrementAndGet()
        );
    }

}