Object Oriented Programming in Swift Ch0 - Encapsulation
- 1. Object Oriented Programming in Swift Ch 0 Sai Li @ Yowoo Tech. 2016/11/18
- 2. References
- 3. References • Agile Software Development: Principles, Patterns, and Practice ( : ) by Robert C. Martin
- 4. References • Agile Software Development: Principles, Patterns, and Practice ( : ) by Robert C. Martin • Fundamental Object Oriented Programming by Hsuan-Tien Lin
- 5. References • Agile Software Development: Principles, Patterns, and Practice ( : ) by Robert C. Martin • Fundamental Object Oriented Programming by Hsuan-Tien Lin • by Teddy Chen
- 6. References • Agile Software Development: Principles, Patterns, and Practice ( : ) by Robert C. Martin • Fundamental Object Oriented Programming by Hsuan-Tien Lin • by Teddy Chen • Essential Object-Oriented Programming by Josh Ko
- 7. Language • Java • Python • Swift
- 8. How to build an iPhone?
- 11. System -> Components Divide and Conquer
- 12. System -> Components Divide and Conquer Modularization
- 13. Good Modules make good System
- 14. Good Modules make good System • Easy to debug
- 15. Good Modules make good System • Easy to debug • Easy to maintain/ manage
- 16. Good Modules make good System • Easy to debug • Easy to maintain/ manage • Easy to modify/ update
- 17. Good Modules make good System • Easy to debug • Easy to maintain/ manage • Easy to modify/ update • Easy to reuse
- 18. Good Modules make good System • Easy to debug • Easy to maintain/ manage • Easy to modify/ update • Easy to reuse
- 19. Good Modules make good System • Easy to debug • Easy to maintain/ manage • Easy to modify/ update • Easy to reuse Modularization: Save time in the future
- 20. Save money, save time No more disposable programs
- 21. Spaghetti Code
- 22. Spaghetti Code Edible is enough
- 23. Spaghetti Code
- 24. Spaghetti Code
- 26. Noodle -> Procedure • More organized than spaghetti code • Identify the purpose • Isolate (modularize) • Reuse
- 27. Noodle -> Procedure • More organized than spaghetti code • Identify the purpose • Isolate (modularize) • Reuse C language
- 28. OOP • Grouped related data
- 29. OOP • Use Struct/ Class to generate objects
- 30. OOP • Don’t do something on the object • Let object takes actions
- 31. OOP • Don’t do something on the object • Let object takes actions
- 32. OOP • Don’t do something on the object • Let object takes actions
- 33. Noodles -> Procedure -> Object
- 34. • NOP: spaghetti code + (possibly spaghetti) data Assembly Noodles -> Procedure -> Object
- 35. • NOP: spaghetti code + (possibly spaghetti) data Assembly • POP: organized code + (possibly organized) data C, PASCAL basic modules: procedures Noodles -> Procedure -> Object
- 36. • NOP: spaghetti code + (possibly spaghetti) data Assembly • POP: organized code + (possibly organized) data C, PASCAL basic modules: procedures • OOP: organized code + organized data (grouped) Swift, Java, Python basic modules: Class / Struct Noodles -> Procedure -> Object
- 37. OO Levels
- 38. OO Levels • OO Analysis: what the system does
- 39. OO Levels • OO Analysis: what the system does • needs -> models
- 40. OO Levels • OO Analysis: what the system does • needs -> models • Software Engineering
- 41. OO Levels • OO Analysis: what the system does • needs -> models • Software Engineering • OO Design: how the system dose it
- 42. OO Levels • OO Analysis: what the system does • needs -> models • Software Engineering • OO Design: how the system dose it • model -> class diagrams
- 43. OO Levels • OO Analysis: what the system does • needs -> models • Software Engineering • OO Design: how the system dose it • model -> class diagrams • Design Pattern
- 44. OO Levels • OO Analysis: what the system does • needs -> models • Software Engineering • OO Design: how the system dose it • model -> class diagrams • Design Pattern • OO Programming how to implement it
- 45. OO Levels • OO Analysis: what the system does • needs -> models • Software Engineering • OO Design: how the system dose it • model -> class diagrams • Design Pattern • OO Programming how to implement it • class diagrams -> implementations
- 46. OO Levels • OO Analysis: what the system does • needs -> models • Software Engineering • OO Design: how the system dose it • model -> class diagrams • Design Pattern • OO Programming how to implement it • class diagrams -> implementations • OOP, this one
- 47. How to build an iPhone?
- 48. Decomposition
- 60. Data Abstraction Abstraction is selective ignorance. by Andrew Koenig
- 61. Data Abstraction Abstraction is selective ignorance. by Andrew Koenig Others care about the interface and ignore the implementation
- 62. Encapsulation Access Control: public and private
- 63. Encapsulation Access Control: public and private
- 64. Encapsulation Access Control: public and private
- 66. Design by Contract • Class Invariant
- 67. Design by Contract • Class Invariant • Valid State
- 68. Design by Contract • Class Invariant • Valid State
- 69. Design by Contract • Class Invariant • Valid State private(set) private(set)
- 70. Design by Contract • Class Invariant • Valid State • 1 <= day <= 31 0 <= hour <= 24 private(set) private(set)
- 71. Design by Contract • Preconditions, postconditions
- 72. Design by Contract • Preconditions, postconditions First class invariant ?
- 73. Design by Contract • Preconditions, postconditions First class invariant ? Constructor
- 82. Encapsulation
- 83. • Separate implementation and use Encapsulation
- 84. • Separate implementation and use • Don’t trust other people including you(3 months after) Encapsulation
- 85. • Separate implementation and use • Don’t trust other people including you(3 months after) • Hide unnecessary details Encapsulation
- 86. • Separate implementation and use • Don’t trust other people including you(3 months after) • Hide unnecessary details • One more oz Encapsulation
- 87. • Separate implementation and use • Don’t trust other people including you(3 months after) • Hide unnecessary details • One more oz Encapsulation
- 88. • Separate implementation and use • Don’t trust other people including you(3 months after) • Hide unnecessary details • One more oz Think about incorrect use about your class Encapsulation
- 89. As a designer, you should avoid giving the users of your code too much freedom to do bad and/or make bugs
- 95. OOP • Encapsulation: Security • Inheritance: Reusability • Polymorphism: Flexibility
- 96. Q & A To be continued…
- 97. References
- 98. References • Agile Software Development: Principles, Patterns, and Practice ( : )
- 99. References • Agile Software Development: Principles, Patterns, and Practice ( : ) • Fundamental Object Oriented Programming
- 100. References • Agile Software Development: Principles, Patterns, and Practice ( : ) • Fundamental Object Oriented Programming •
- 101. References • Agile Software Development: Principles, Patterns, and Practice ( : ) • Fundamental Object Oriented Programming • • Essential Object-Oriented Programming
- 102. References • Agile Software Development: Principles, Patterns, and Practice ( : ) • Fundamental Object Oriented Programming • • Essential Object-Oriented Programming • images.techtimes.com/data/images/full/11234/tangled-earbuds.jpg
- 103. References • Agile Software Development: Principles, Patterns, and Practice ( : ) • Fundamental Object Oriented Programming • • Essential Object-Oriented Programming • images.techtimes.com/data/images/full/11234/tangled-earbuds.jpg • spaghetticrunch.com/wp-content/uploads/2014/12/spaghetti- bolognaise-1.png
- 104. References • Agile Software Development: Principles, Patterns, and Practice ( : ) • Fundamental Object Oriented Programming • • Essential Object-Oriented Programming • images.techtimes.com/data/images/full/11234/tangled-earbuds.jpg • spaghetticrunch.com/wp-content/uploads/2014/12/spaghetti- bolognaise-1.png • upload.wikimedia.org/wikipedia/commons/thumb/e/ea/ Design_by_contract.svg/220px-Design_by_contract.svg.png
- 105. References • Agile Software Development: Principles, Patterns, and Practice ( : ) • Fundamental Object Oriented Programming • • Essential Object-Oriented Programming • images.techtimes.com/data/images/full/11234/tangled-earbuds.jpg • spaghetticrunch.com/wp-content/uploads/2014/12/spaghetti- bolognaise-1.png • upload.wikimedia.org/wikipedia/commons/thumb/e/ea/ Design_by_contract.svg/220px-Design_by_contract.svg.png • www.linuxdigest.org/wp-content/uploads/2012/06/09fig091.gif