摘要：SOLID设计原则 SRP Single Reposibility Principle 单一职责原则 A class should have one,and only one,reason to change. 就一个类而言，有且仅有一个引起它变化的原因。 每个类都必须要有一个唯一的明确的职责，只做 阅读全文

摘要：GRASP原则 General Responsibility Assignment Software Pattern 通用职责分派软件模式 Information Expert assign the responsibility to the class that has the informati 阅读全文