クラスの抽象化とオブジェクト インターフェース

またその違い

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1. Ϋϥεͷந৅ԽͱΦϒδΣΫτ ΠϯλʔϑΣʔε ·ͨͦͷҧ͍
2. ·ͣɺܧঝͷ෮श ܧঝར༻͢Δͱɿ ɾಉ͡ίʔυΛ࢖͍ճͤΔ ɾϓϩάϥϜ͸ϝϯςφϯε͠΍͘͢ͳΔ ɾOOPͷجຊͳͷͰઈର๨Εͳ͍Α͏ʹ͠· ͠ΐ͏ʢDRY - Don’t Repeat Yourself)
3. ந৅Խ
4. ந৅ԽΫϥεͱ͸ ར༻Ͱ͖Δɺ·ͨந৅ͷίϯεΤϓτΛ୅ද͢ΔΫϥεɻ Vehicleʢ৐Γ෺ʣ <- ந৅ͷίϯεΤϓτ drive() <- ͢΂ͯͷ৐Γ෺ΛӡసͰ͖Δ͕ɺӡసͷ࢓ํ͸ҧ͏ Animalʢಈ෺ʣ <- ந৅ͷίϯεΤϓτ eat() <- ͢΂ͯͷಈ෺Λ৯΂ͯΔ͕ɺ৯΂ํ͸ҧ͏
5. ந৅ԽΫϥεΛ͍ͭ࢖͏ʁ ɾνʔϜͷΤϯδχΞʢ΋͘͠͸ࣗ෼ʣʹΫϥεͷϝιουΛ࢖Θͤͨ ͍͕ɺ໊લ͔ܾ͠·ͬͯͳ͍࣌ͱ͔ Αͬͯɺ Bicycle extends Vehicleͷdrive()ͱCar extends Vehicleͷdrive()͸ɺ ίʔυͷதͰҧ͏͸ͣɻ ΋͠Bicycleͷdrive()ͷதʹΦΠϧަ׵ͷ΍ΓํΛॻ͖ࠐΉͱɺͦΕ͸͓ ͔͍͠Ͱ͠ΐɻ
6. ந৅ԽΫϥε͔ΒࢠΫϥεͷ ࡞Γํ ɾΫϥεʹந৅ԽϝιουʹೖΕͨΒɺΫϥε΋ந৅Խʹ͠ͳ͍ͱ͍͚ͳ͍ ɾٯʹந৅ԽΫϥεʹந৅Խ͡Όͳ͍ϝιουΛೖΕΔͷ͕Մೳɻproperties΋େ ৎ෉ ɾந৅ԽΫϥε͔ΒΦϒδΣΫτΛ࡞Εͳ͍ͨΊɺந৅ԽΫϥεͷίʔυܧঝ͢Δ ࢠΫϥεΛ࡞Βͳ͍ͱ͍͚ͳ͍ ɾextendsͷΩʔϫʔυͰఆٛ͞ΕΔɻ·ͨɺந৅ԽΫϥε͔Βܧঝ͞ΕΔࢠΫϥ ε͸ɺந৅ԽϝιουʹbodyΛఆٛ͠ͳ͍ͱ͍͚ͳ͍ɻ
7. ந৅ԽΫϥεͷ͜ͱΛ·ͱΊ Δͱɿ ɾந৅Խ͞ΕͨΫϥε͔ΒΠϯελϯεԽͰ͖ͳ͍ʢͭ·ΓΫϥε͔ΒΦϒδΣΫτ࡞Εͳ ͍ʣ ɾந৅Խͷϝιου͸Ϋϥεʹ࣮૷͞Εͯͳ͍ʢsignatureͷΈʣ ɾΫϥεΛܧঝ͠ͳ͍ͱ͍͚ͳ͍ ɾࢠΫϥε͸͢΂ͯͷந৅ԽͷϝιουΛ࣮૷͠ͳ͍ͱ͍͚ͳ͍ʢvisibilityΛ޿ΊΒΕͳ͍ʣ ɾͪͳΈʹconstructorΛೖΕΒΕΔ͕ɺΠϯελϯεͰ͖ͳ͍ͨΊɺ௚઀Ϋϥε͔Βݺ΂ͳ ͍ ɾந৅ԽͷϝιουΛೖͬͯΔΫϥε͕͍ͭ΋ந৅ԽͷΫϥεͰ͋Δɻ ීஈந৅ԽΫϥεΛpublic abstract classͰ࡞Δ͕ɺͦΕΛ๨ΕͯΫϥεͷதʹabstract public methodΛೖΕͨΒɺΫϥεࣗମ͕ந৅Խ͞ΕΔʢPHP͸ΤϥʔʹͳΔ͚Ͳʣ
8. ΠϯλʔϑΣʔε
9. ΠϯλʔϑΣʔεͱ͸ ɾجຊతʹɺந৅ԽΫϥε ɾ͔ͩΒɺந৅ԽΫϥε͘͢͝ࣅͯΔʢͦͯ͠ҧ͍͸Θ͔ΓͮΒ͍ʣ ɾܧঝ͸ϝΠϯ ɾΦϒδΣΫτͷΠϯλʔϑΣʔε͸ɺͲΜͳϝιουΛࢠΫϥε͕࣮૷͠ͳ͍ͱ͍͚ͳ͍͔ ΛܾΊΒΕΔ ɾinterfaceΩʔϫʔυͰ࣮૷͞ΕΔ ɾΠϯλʔϑΣʔεʹ͸ɺpublicϝιου͚ͩΛೖΕΒΔʢͦΕ͸ΠϯλʔϑΣʔεͷಛ௃ʣ ɾΠϯλʔϑΣʔε͸implementsͷΩʔϫʔυͰܧঝ͞ΕΔʢextendsͰ͸ͳͯ͘ʣ ɾϝιου໊͕͔ͿΒͳ͍ݶΓɺҰͭͷΫϥεʹɺ͍͔ͭ͘ͷΠϯλʔϑΣʔεΛ࣮૷Ͱ͖Δ ɾந৅ԽΫϥεΈ͍ͨʹɺந৅Խϝιουͱconst͕ೖΕΒΕΔ ɾಉ࣌ʹɺந৅ԽͱҧͬͯɺΠϯλʔϑΣʔεʹpublicϝιου͔͠ೖΕΒΕͳ͍ɻ·ͨɺม ਺΋ఆٛͰ͖ͳ͍
10. ͳΜͰΠϯλʔϑΣʔεΛ࢖͏ʁ ɾࢠΫϥεΛ࡞Δ࣌ʹɺࢠΫϥε͸ઈରΠϯλʔϑΣʔεͷϝιουΛ ࢖Θ͍ͤͨ࣌ ɾͦΕͰڞಉ։ൃͷͱ͖ɺνʔϜϝϯόʔ͕͢΂ͯͷϝιουΛ࢖͏͜ ͱΛ֬ೝͰ͖Δ ɾ͜͜Ͱந৅ԽΫϥεͱͷҧ͍͕ͰΔ ʢந৅ԽΫϥεΛ࣮૷͢Δ࣌ɺશ ෦ͷϝιουΛ࢖Θͳͯ͘΋OKʣ ɾࢥͬͨ͜ͱɿઃܭͷ࣌ʹ࢖͑ͦ͏
11. ͍ͭந৅Խʁ͍ͭΠϯλʔϑΣʔεʁ <?php class X extends Y { } // X ͸ɹΫϥεͷ෦෼ͷYΛ׬੒ͤ͞Δ class X implements Y { } // X ͸ɹY ݴޠͰ࿩͢͜ͱʹࢍ੒͢Δ ?> ݁࿦ɺந৅Ϋϥεͬͯʁ ܧঝؔ܎Λ΋࣮ͭ૷ͷ࠶ར༻ΛͰ͖Δɻ ܧঝͱଟଶੑΛཁٻ͢Δҙຯ͍͕͋ڧ͍ɻ ݁࿦ɺΠϯλϑΣʔεͬͯʁ Ϋϥεͷܕ(࢓༷)Λఆٛ͢Δ΋ͷɻ ΧϓηϧԽͱଟଶੑΛཁٻ͢Δҙຯ͍͕͋ڧ͍ɻ
12. ҧ͍Λ·ͱΊͯΔͱ
13. ந৅ԽΫϥεʹ͸ɺϝιου͕abstractͱ͔ͯ͠ී௨ͷϝιουΛఆٛͰ͖Δɻ΋͠ϝ ιου͸ந৅Ͱ͋Ε͹ɺͦͷϝιου͕extend͞ΕͨࢠΫϥεʹఆٛ͠ͳ͍ͱ͍͚ͳ͍ ΠϯλʔϑΣʔεʹ͸ɺ͢΂ͯͷϝιου͸ந৅ɻͦͷͨΊʹɺ͢΂ͯͷϝιουΛΫϥ εͷதͰఆٛ͠ͳ͍ͱ͚ͳ͍ɻ ᶃɹ
14. ந৅ԽΫϥεʹ͸ɺϝιουΛpublic͔privateͰ΋ఆٛͰ͖Δɻ ΠϯλʔϑΣʔεʹ͸ɺ͢΂ͯͷϝιου͸public. ᶄɹ
15. ந৅ԽΫϥεʹ͸ɺந৅Ͱ͸ͳ͍ݶΓɺϝιου΋properties΋۩ମతͳίʔυΛೖΕΒ ΕΔɻ ΠϯλʔϑΣʔεʹ͸ɺproperties͸ఆٛͰ͖ͣɺϝιουʹத਎ΛೖΕͪΌμϝɻ ᶅɹ
16. Ϋϥε͸Ұ͚ͭͩͷந৅ԽΫϥεΛextendͰ͖Δ͕ɺແؔ܎Ͱ΋ɺΫϥεʹແݶʢ͓ͦΒ ͘255)ͷΠϯλʔϑΣʔεΛimplementͰ͖Δ ᶆɹ
17. ந৅ԽΫϥεͷϝιουͷ্ॻ͖͸Մೳ͕ͩʢࣗ༝ʣɺΠϯλʔϑΣʔεͷ৔߹͢΂ͯͷ ϝιουΛ্ॻ͖͠ͳ͍ͱ͍͚ͳ͍ɻ ᶇɹ
18. ࢀߟURL http://www.xpertdeveloper.com/2014/07/abstract-vs-interface/ https://codeinphp.github.io/post/abstract-class-vs-interface/ http://www.techflirt.com/tutorials/oop-in-php/abstract-classes-interface.html https://paulund.co.uk/using-interface-and-abstract-classes-in-php http://php.net/manual/en/language.oop5.abstract.php https://stackoverflow.com/questions/6373224/what-are-the-advantage-if-i-use- abstract-class-in-php http://www.xpertdeveloper.com/2011/10/abstract-in-php/ http://www.xpertdeveloper.com/2011/10/interface-in-php/ http://jaskokoyn.com/2013/06/11/interfaces/ http://phpenthusiast.com/object-oriented-php-tutorials/inheritance-in-object-oriented- php http://phpenthusiast.com/object-oriented-php-tutorials/interfaces http://phpenthusiast.com/object-oriented-php-tutorials/abstract-classes-and-methods https://stackoverflow.com/questions/1913098/what-is-the-difference-between-an- interface-and-abstract-class https://www.javatpoint.com/difference-between-abstract-class-and-interface http://qiita.com/chkkchy/items/643eed88f59bd2b44d71