public Builder<G, C> offspringSelector(final Selector<G, C> selector) {
			_evolutionParams.offspringSelector(selector);
			return this;
		}
The selector used for selecting the offspring population. <i>Default
values is set to {@code TournamentSelector<>(3)}.</i>

@param selector used for selecting the offspring population
@return {@code this} builder, for command chaining
@throws NullPointerException if one of the {@code selector} is
        {@code null}.
jenetics/src/main/java/io/jenetics/engine/Engine.java