Builder Pattern

public class NutritionFacts {

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

    public static class Builder {   

        private final int servingSize;
        private final int servings;

        private int calories = 0;
        private int fat = 0;
        private int sodium = 0;

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

    private NutritionFacts(Builder builder) {

        servingSize   = builder.servingSize;
        servings      = builder.servings;
        calories      = builder.calories;
        fat           = builder.fat;
        sodium        = builder.sodium;
    }
}