在EffectiveJava(第2版)的第2项中，作者提到了以下关于在使用构建器时对参数施加不变量的内容:Itiscriticalthattheybecheckedaftercopyingtheparametersfromthebuildertotheobject,andthattheybecheckedontheobjectfieldsratherthanthebuilderfields(Item39).Ifanyinvariantsareviolated,thebuildmethodshouldthrowanIllegalStateException(Item60).这是否意味着在