Builder

public class NutritionFacts {

    private final int servingSize;
    private final int servings;
    private final int calories;
    private final int fat;
    private final int sodium;
    private final int carbohydrate;

    public static class Builder {
        // Required parameters
        private final int servingSize;
        private final int servings;

        // Optional parameters - initialized to default values
        private int calories = 0;
        private int fat = 0;
        private int sodium = 0;
        private int carbohydrate = 0;

        private Builder(int servingSize, int servings) {
            this.servingSize = servingSize;
            this.servings = servings;
        }

        public Builder calories(int val) {
            this.calories = val;
            return this;
        }

        public Builder fat(int val) {
            this.fat = val;
            return this;
        }

        public Builder sodium(int val) {
            this.sodium = val;
            return this;
        }

        public Builder carbohydrate(int val) {
            this.carbohydrate = val;
            return this;
        }

        public NutritionFacts build() {
            return new NutritionFacts(this);
        }

    }

    public static Builder builder(int servingSize, int servings) {
        return new Builder(servingSize, servings);
    }

    private NutritionFacts(Builder builder) {
        servingSize = builder.servingSize;
        servings = builder.servings;
        calories = builder.calories;
        fat = builder.fat;
        sodium = builder.sodium;
        carbohydrate = builder.carbohydrate;
    }

    public static void main(String[] args) {
        NutritionFacts facts = NutritionFacts.builder(10, 10)
                .calories(10)
                .sodium(8)
                .fat(9)
                .carbohydrate(12)
                .build();
        System.out.println(facts.sodium);
    }
}