Can You Decode This Mind‑Bending Java 8 Code Challenge?

Java 8 introduced many syntactic sugars and features that revitalized the language.

Even though Java 16 has been released for months and Java 17 is imminent, many developers still stick with Java 8.

This article presents an abstract, highly flexible Java 8 code snippet designed to test your proficiency.

public interface O {
    interface $<A> {
        <B> void $();
    }

    void O($<O> o);

    default O O() {
        return
            $<O>::<O>$;
    }
}

The code is intentionally obscure and can accommodate complex logic, but such style is rarely used in practice and would likely be frowned upon by colleagues.

Understanding and writing such code requires creativity and patience; the author spent nearly an hour deciphering it and invites readers to share how long it took them.