identify build in functional interface

Question

Q: Given the following lambda expression: (name, age, isAdult) -> new Person(name, age, isAdult), identify the build in interface.

I've managed to write my own functional interface:

@FunctionalInterface
public interface Generator<T,U,V,R> {
    R generate(T t, U u, V v);
}

But I don't know if is necessary to write this interface, or java already has a build-in interface.

Answer 1

Nope. There's nothing in the java.util.function package which applies to this.

If the function only had 2 arguments, e.g.

(name, age) -> ...

then you could use BiFunction but there is no "TriFunction".