OOP Basic
32
Object Oriented Programming 20150111 Yeti
Transcript of OOP Basic
Object Oriented Programming
20150111 Yeti
軟體開發是⾨門藝術
軟體開發是⾨門藝術
簡單
http://static2.ithome.com.tw/uploads/image-upload/53188aecc6cb4.jpg
• ⼤大家都會說話、看書（⾃自然語⾔言）
• 國⼩小⽣生會寫網⾴頁、Flash（程式語⾔言）
• 國中⽣生會寫外掛（Script語⾔言）
• 全世界都講中國話
ＷＡＲＮＩＮＧ
問題ＷＡＲＮＩＮＧ
軟體開發的問題
• 重⽤用性
• 維護性
• 品質
• 擴充性
OOP
• OOP(Object Oriented Programming)
• ⾯面向对象程序设计
• 物件導向程式設計
• 始祖：Simula —> Smalltalk(發揚光⼤大)
特性
• 封裝(Encapsulation)
• 繼承(Inheritance)
• 多型(Polymorphism)
startup()shutdown()getOS()setOS()
- cpu- ram- disk- os
Laptop
InstallWindows()
WindowsInstallable
getOS()setOS()recovery()
Mac
getOS()setOS()fastBoot()openOpticalDrive()closeOpticalDrive()
- opticalDriveASUS
InstallOSX()
OSXInstallable
Encapsulation• 隱藏某個步驟，透過定義的⽅方式進⾏行存取
startup()shutdown()getOS()setOS()
- cpu- ram- disk- os
Laptop
InstallWindows()
WindowsInstallable
getOS()setOS()recovery()
Mac
getOS()setOS()fastBoot()openOpticalDrive()closeOpticalDrive()
- opticalDriveASUS
InstallOSX()
OSXInstallable
startup()shutdown()getOS()setOS()
- cpu- ram- disk- os
Laptop
InstallWindows()
WindowsInstallable
getOS()setOS()recovery()
Mac
getOS()setOS()fastBoot()openOpticalDrive()closeOpticalDrive()
- opticalDriveASUS
InstallOSX()
OSXInstallable
Inheritance• 擴充既有物件
startup()shutdown()getOS()setOS()
- cpu- ram- disk- os
Laptop
InstallWindows()
WindowsInstallable
getOS()setOS()recovery()
Mac
getOS()setOS()fastBoot()openOpticalDrive()closeOpticalDrive()
- opticalDriveASUS
InstallOSX()
OSXInstallable
Polymorphism• 根據不同類型做相對應的動作
startup()shutdown()getOS()setOS()
- cpu- ram- disk- os
Laptop
InstallWindows()
WindowsInstallable
getOS()setOS()recovery()
Mac
getOS()setOS()fastBoot()openOpticalDrive()closeOpticalDrive()
- opticalDriveASUS
InstallOSX()
OSXInstallable
⼩小蛋糕
• 吉娃娃是狗，⽐比特是狗
• 吉娃娃體型⼩小、⽐比特體型⼤大
• 吉娃娃神經質、⽐比特兇猛
• 吉娃娃跟⽐比特都會跑
• Rick是⼈人，⼈人跟狗同屬動物
• ⼈人會跑
• 狗有四隻腳，⼈人有兩隻腳
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• 繼承很好⽤用，看起來很強⼤大
• C++⽀支援多重繼承
• Java不⽀支援多重繼承，以Interface替代
• 繼承很好⽤用，看起來很強⼤大
• C++⽀支援多重繼承
• Java不⽀支援多重繼承，以Interface替代Why?
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介⾯面• 定義於不同物件中、具相同特性的功能
startup()shutdown()getOS()setOS()
- cpu- ram- disk- os
Laptop
InstallWindows()
WindowsInstallable
getOS()setOS()recovery()
Mac
getOS()setOS()fastBoot()openOpticalDrive()closeOpticalDrive()
- opticalDriveASUS
InstallOSX()
OSXInstallable
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Class & Object?
Class & Object?
• Class 是定義
• Object 是根據Class定義⽽而產⽣生出來的實體
modifier• public
• protected
• Visibility: C++(Inherit), Java(Inherit||Package)
• private
• static
• like global. share in same Class. (EX:Definition)
Design Pattern?
Next time…(maybe)
