Java quiz on lambdas+overloading

import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Test {
    @FunctionalInterface
    interface Varargs { String meth(int i, String... strings); }

    @FunctionalInterface
    interface NoVarargs { String meth(int i); }

    @org.testng.annotations.Test
    public void test() {
        Varargs f1 = this::myMethod;
        System.out.println(f1.meth(2, "hello", "world"));

        NoVarargs f2 = this::myMethod;
        System.out.println(f2.meth(2));
    }

    String myMethod(int i, String... strings) {
        return i + ":" + Stream.of(strings).collect(Collectors.joining(":"));
    }

    // String myMethod(Integer i) { return i + ":NO_STRINGS: Integer"; }
    // String myMethod(Long i) { return i + ":NO_STRINGS: Long"; }
    // String myMethod(byte i) { return i + ":NO_STRINGS: byte"; }
    // String myMethod(Byte i) { return i + ":NO_STRINGS: Byte"; }
    // String myMethod(Float i) { return i + ":NO_STRINGS: Float"; }
    // String myMethod(float i) { return i + ":NO_STRINGS: float"; }
    // String myMethod(Double i) { return i + ":NO_STRINGS: Double"; }
    // String myMethod(double i) { return i + ":NO_STRINGS: double"; }
}