# inventorym

Inheritance: Shows inheritance relationships (Drawing, Painting, Print, Sculpture extending InventoryPiece)
Associations: Shows composition relationships (Customer has Address, Transaction has Address and InventoryList)
Enumerations: InventoryType and TransactionOperationEnum
Exceptions: four application exception classes extend RuntimeException
Manager Classes: Singleton pattern managers with their collections
Collections: Custom list classes extending ArrayList


Abstract base class (InventoryPiece) with 4 concrete implementations (Drawing, Painting, Print, Sculpture)
Enumerations (InventoryType, TransactionOperationEnum)
Manager classes (Singleton pattern): InventoryManager, CustomerManager, TransactionManager
Model classes: Customer, Address, Transaction
Collection classes: InventoryList, CustomerList, TransactionList
Repository: DataRepository for persistence
Exception classes: 4 custom runtime exceptions

Relationships shown:

Inheritance (empty arrow heads)
Composition (diamond arrow heads)
Associations (open arrow heads)
Dependencies (dashed lines)