What does additive method mean and which method basic methods?

No, Java only allows a method to be defined within a class, not within another method.

in the form of photons

Two types of fermentation for champagne. One uses co2 to form bubbles.

Having bareback sexual intercourse between a man and a woman at the point where they are both at their most fertile.

Yes, since pulling out is NOT a reliable form of birth control!