Consider builder--effective Java reading notes when encountering multiple constructor parameters

/** * If you have multiple parameters in a class constructor or static factory, the builder mode is a good choice when designing this class, especially if most of the parameters are optional. * Client code using the Builder mode is easier to read and write than using the traditional overlay constructor pattern, and the builder is more secure than JavaBeans. * * @author Liu Xiangfeng * * * * Public  class nutritionfacts {    //All the parameters    Private Final intServingsize;Private Final intservings;Private Final intcalories;Private Final intFatPrivate Final intSodiumPrivate Final intCarbohydrate; Public Static  class Builder {        //Required parameters, final guarantees that it must be assigned a value        Private Final intServingsize;Private Final intservings;//Options available        Private intCalories =0;Private intFat =0;Private intSodium =0;Private intCarbohydrate =0;/** * Complete initialization of the required parameters in the constructor * * @param servingsize * @param servings */         Public Builder(intServingsize,intServings) { This. servingsize = servingsize; This. servings = servings; }/** * * @param val * Assign a value to an option * @return Builder object for chain adjustment Use the Assignment function * /         PublicBuildercalories(intval) {calories = Val;return  This; } PublicBuilderFat(intval) {fat = val;return  This; } PublicBuilderSodium(intval) {sodium = Val;return  This; } PublicBuilderCarbohydrate(intval) {carbohydrate = Val;return  This; }/** * Create a Get object method and pass yourself (Builder) as a parameter * * @return nutritionfacts Object */         PublicNutritionfactsBuild() {return NewNutritionfacts ( This); }    }/** * Privatisation constructor, guaranteed to operate on the same object * * @param Builder incoming constructor to assign value */    Private nutritionfacts(Builder builder)        {servingsize = builder.servingsize;        servings = builder.servings;        calories = builder.calories;        Fat = Builder.fat;        Sodium = Builder.sodium;    Carbohydrate = builder.carbohydrate; }/** * Test method * * @param args */     Public Static void Main(string[] args) {Nutritionfacts CocaCola =NewNutritionfacts.builder ( -,8). Calories ( -). Sodium ( *). Carbohydrate ( -). build (); }}

Consider builder--effective Java reading notes when encountering multiple constructor parameters