Paymento abstract class indicated by italics amount: Money Cash Credi Check Payment Payment Payment
Cash Payment Credit Payment Check Payment Payment amount : Money abstract class indicated by italics
Payment Payment Cash Credit Check Cash Credit Check Pay ment Payment Payment Payment Payment Payment Class hierarchy with separate and shared arrow notations
Class hierarchy with separate and shared arrow notations
100% Rule Superclass的定义应该100%适用于 subclass ● Subclass必须100%符合 superclassI的: attributes ● associations Payment Pays-for Sale amount: Money Cas h Credit Check Payment Payment Pay ment
100% Rule Superclass的定义应该100%适用于 subclass. Subclass必须100%符合superclass的: ⚫ attributes ⚫ associations
/9/we Subclass is a Superclass e CreditPayment is a payment
Is-a Rule Subclass is a Superclass ⚫ CreditPayment is a Payment
何时定义子类和父类
何时定义子类和父类