以下是一个更复杂的Mermaid类图示例，展示了多层次的类关系、接口实现、继承关系和关联类型： ```mermaid classDiagram %% 定义接口 interface IPaymentProcessor { +processPayment(amount: double) bool +refundPayment(transactionId: string) bool } %% 定义抽象类 abstract class Person { -id: string -name: string -email: string +register(): void +authenticate(): bool } %% 定义具体类 class Customer { -customerId: string -shippingAddress: Address -billingAddress: Address +placeOrder(): Order +viewOrderHistory(): Order[] } class Employee { -employeeId: string -department: Department -salary: double +clockIn(): DateTime +clockOut(): DateTime } class Admin { -accessLevel: int +manageInventory(): void +generateReports(): Report[] } class Order { -orderId: string -orderDate: DateTime -status: OrderStatus +calculateTotal(): double +updateStatus(): void } class Product { -sku: string -name: string -price: double +checkStock(): int +updatePrice(newPrice: double): void } class CreditCardProcessor { -apiKey: string +processPayment(amount: double) bool +refundPayment(transactionId: string) bool +validateCard(cardNumber: string): bool } %% 定义枚举 class OrderStatus { <> PENDING PROCESSING SHIPPED DELIVERED CANCELLED } class Department { <> SALES MARKETING IT HR } %% 定义关系 Person <|-- Customer Person <|-- Employee Employee <|-- Admin IPaymentProcessor <|.. CreditCardProcessor Customer "1" --> "0..*" Order: places Order "1" --> "1..*" Product: contains Employee "1" --> "1" Department: belongs to Admin --> Product: manages Order o-- OrderStatus: has ``` 这个类图展示了以下复杂特性： 1. 接口(IPaymentProcessor)和实现类 2. 抽象类(Person)和具体子类 3. 多重继承层次 4. 一对多和多对一关联关系 5. 组合关系(Order和OrderStatus) 6. 枚举类型 7. 类属性可见性(public +, private -) 8. 方法定义 9. 多重角色(Admin既是Employee也是Person) 您可以根据需要进一步扩展或修改这个示例。