69 UML Use Case Diagram Order Statemen t Withdraw Cash Check Balance BankMember

69 uml use case diagram order statemen t withdraw

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69 UML Use Case Diagram Order Statemen t Withdraw Cash Check Balance BankMember Select Account «include» «include» «include» CardHolder Print Balance «extend»
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70 UML Activity Diagram ATM Customer Select withdrawal Display menu Dispense cash Notify user Select amount ATM System [Insufficient funds] [Sufficient funds] Return card User takes card
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71 UML Class Diagram CardHolder Debit Credit holds 1..3 * Account Transaction 1 * Simple ATM class diagram, showing static structure for banking domain
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72 UML Collaboration Diagram Collaboration diagram  with interactions  realizing the Withdraw  Cash use case  :ATMCustomer 1:select withdrawal menu 2:select amount 3:withdraw sum 4:debit account :ATMUI :CashDispenser :CardHolder :Account :Debit 5:add debit 6:dispense sum
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73 UML Sequence Diagram select withdrawal menu withdraw sum add debit debit account dispense sum select amount withdraw sum return card :ATMUI :CashDispenser :ATMControl :CardHolder :Account :Debit
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74 UML State Diagram inDebit entry/balance -= pen inCredit withdraw(sum) [sum >balance] /balance -=sum deposit(sum) [sum >= balance] /balance += sum withdraw(sum) /balance -=sum deposit(sum) / balance+=sum withdraw(sum) /balance -=sum deposit(sum) / balance+=sum exit /balance = 0 close close
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77 Summary UML is a an expressive and flexible visual modelling language Emerged in the mid 90s, Combines ideas from several notations Should distinguish between System, design, model and diagram UML supports modelling from different viewpoints: Functional view Static view Dynamic view
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78 Lecture 6: Class Models and Diagrams Class models What makes a good class? Developing the class model Finding classes and associations (Part 1) Noun identification Basics of UML Class Diagrams Class notation Associations ATM Case Study: initial class model
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79 What is a Class Model? Model of the static structure of a system What classes are there? How are these classes related? Allocation of class responsibilities : Management of data within the system Behavioural responsibilities of classes May not be immediately concerned with: functional requirements how classes interact to achieve behaviour
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80 What Makes a Good Class Model? A good class model consists of classes that 1. can provide all of the required system behaviour 2. represent (as far as possible) enduring domain objects If 1 is self-evident, 2 is more like an act of faith: –. part of the object oriented design philosophy –. modelling the application domain can provide a good basis for developing the required software –. in practice, need to compromise between 1 and 2
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81 Developing the Class Model Class model typically developed in stages: Analysis phase : Classes in problem domain of primary interest Basic relationships between classes Little detail about class responsibilities Design phase : Additional classes provided for implementation Class responsibilities (attributes, operations) refined Relationships between classes refined
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