我对“EffectiveJava”中介绍的“BuilderPattern”有疑问。我们是否需要.build()方法来正确实现模式？例如，假设我们有以下类:publicclassCoffeeDrink{privateintnumEspressoShots;privateshortmilkType;privatebooleanwithWhip;privateCoffeeDrink(){}publicstaticCoffeeDrinkbuildNewDrink(){returnnewCoffeeDrink();}publicCoffeeDrinkwithEspresso(intn){this