year_2020/src/main/java/nl/mwensveen/adventofcode/year_2020/day_21/AllergenInput.java
public Builder addAllergens(Allergen... allergensElements) {
            if (allergensElements == null) {
                throw new IllegalArgumentException("allergensElements is null");
            }
            Collections.addAll(this.allergens, allergensElements);
            return this;
        }
/**
         * Adds to the {@link #allergens} property of this builder
         *
         * @param allergens
         * @return this builder
         * @throws IllegalArgumentException if allergens is null or contains a null element
         */
Adds to the  #allergens property of this builder
@param allergens
@return this builder
@throws IllegalArgumentException if allergens is null or contains a null element
Adds to the #allergens property of this builder @param allergens @return this builder @throws IllegalArgumentException if allergens is null or contains a null element
public Builder addAllergens(Allergen... allergensElements) {
            if (allergensElements == null) {
                throw new IllegalArgumentException("allergensElements is null");
            }
            Collections.addAll(this.allergens, allergensElements);
            return this;
        }
public Builder addAllergens ( Allergen ... allergensElements ) { if ( allergensElements == null ) { throw new IllegalArgumentException ( "allergensElements is null" ) ; } Collections . addAll ( this . allergens , allergensElements ) ; return this ; }
Adds to the {@link #allergens} property of this builder
 @param allergens
 @return this builder
 @throws IllegalArgumentException if allergens is null or contains a null element
Adds to the { @link #allergens } property of this builder @param allergens @return this builder @throws IllegalArgumentException if allergens is null or contains a null element