Class a is on the classpath of the system class loader, and a's superclass, B, is on the classpath of a user-defined class loader, which is a child of the system class loader.
类a在系统类装入器的类路径中，而A的超类b，在用户自定义的类装入器的类路径中，这个类装入器是系统类装入器的孩子。
The system requirements and design models are defined by UML diagrams such as Use Case diagram, Class diagram, Sequence diagram, Collaboration diagram, Component diagram, and Deployment diagram.
利用UML的用例图、类图、时序图、合作图、组件图和部署图等，定义系统需求，描述系统设计。
Social stratification, where social class is strictly defined and enforced, and social mobility is non - existent (see caste system).
社会阶层化，当社会阶级被严格的定义以及执行而且社会流动根本不存在(参照种姓制度)。
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