builder method

public class  {
    private final int servingSize; //(mL)             required
    private final int servings;    //(per container)  required
    private final int calories;    //                 optional
    private final int fat;         //                 optional
    private final int sodium;      //(mg)             optional
    private final int carbohydrate;//(g)              optional

    public (int servingSize, int servings) {
        this(servingSize, servings, 0);
    }

    public (int servingSize, int servings,
            int calories) {
        this(servingSize, servings, calories, 0);
    }

    public (int servingSize, int servings,
            int calories, int fat) {
        this(servingSize, servings, calories, fat, 0);
    }

    public (int servingSize, int servings,
            int calories, int fat, int sodium) {
        this(servingSize, servings, calories, fat, sodium, 0);
    }

    public NutritionFacts(int servingSize, int servings,
            int calories, int fat, int sodium, int carbohydrate) {
                this.servingSize = servingSize;
                this.servings = servings;
                this.calories = calories;
                this.fat = fat;
                this.sodium = sodium;
                this.carbohydrate = carbohydrate;
    }
}

//JavaBeans pattern
public class NutritionFacts {
    // Parameters initialized to default values (if any)
    private int servingSize = -1;  //(mL)             required
    private int servings    = -1;  //(per container)  required
    private int calories    = 0;   //                 optional
    private int fat         = 0;   //                 optional
    private int sodium      = 0;   //(mg)             optional
    private int carbohydrate = 0;  //(g)              optional


    //Setters
    public NutritionFacts(){ }
    public void setServingSize(int val) {this.servingSize = val;}
    public void setServings(int val) {this.servings = val;}
    public void setCalories(int val) {this.calories = val;}
    public void setFat(int val) {this.fat = val;}
    public void setSodium(int val) {this.sodium = val;}
    public void setCarbohydrate(int val) {this.carbohydrate = val;}

}

//Builder pattern
public class NutritionFacts {
    private final int servingSize; //(mL)             required
    private final int servings;    //(per container)  required
    private final int calories;    //                 optional
    private final int fat;         //                 optional
    private final int sodium;      //(mg)             optional
    private final int carbohydrate;//(g)              optional

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

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

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


NutritionFacts cocaCola = new NutritionFacts.Builder(240, 8).calories(100).
                            sodium(35).carbohydrate(27).build();
//initialize in chain