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オブジェクト指向でなぜつくるのか 第4章
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Aoi Ujiie
September 30, 2021
Programming
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オブジェクト指向でなぜつくるのか 第4章
Aoi Ujiie
September 30, 2021
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Transcript
ࢯՈѮ!ྠಡձʹͯ ΦϒδΣΫτࢦͰͳͥ࡞Δͷ͔ ୈষ001ແବΛল͍ͯཧ͢Δٕज़
w ߏԽݴޠͷ՝ͱ001ͷࡾେཁૉ w 001ͷࡾେཁૉΫϥε w 001ͷࡾେཁૉϙϦϞʔϑΟζϜ w 001ͷࡾେཁૉܧঝ w ͞ΒʹਐԽͨ͠001ͷΈ
w ύοέʔδ w ྫ֎ w ΨϕʔδίϨΫγϣϯ w ͓͠·͍ʹ ΞδΣϯμ
ߏԽݴޠͷ՝ͱ001ͷࡾେཁૉ
ߏԽݴޠͷ՝ͱ001ͷࡾେཁૉ ߏԽݴޠͷ՝͓͞Β͍ ߏԽݴޠͰղܾͨ͠ w (050จͷഇࢭɺϩδοΫΛॱ࣍ਐߦɺ݅ذɺ܁Γฦ͠ͷͭʹߏԽ جຊࡾߏ w ڞ௨αϒϧʔνϯͷಠཱੑ্ ϩʔΧϧมͱҾʹΑΔ͠
ߏԽݴޠͰͬͨ՝ w άϩʔόϧม w ශऑͳ࠶ར༻ੑ ΑΓେنͳ࠶ར༻ͷඞཁੑ͕ߴ·͍ͬͯͨ
ߏݴޠͰղܾͨ͠ w (050จͷഇࢭɺϩδοΫΛॱ࣍ਐߦɺ݅ذɺ܁Γฦ͠ͷͭʹߏԽ جຊࡾߏ w ڞ௨αϒϧʔνϯʹΑΔ࠶ར༻ ߏԽݴޠͰͬͨ՝ w άϩʔόϧม
w ශऑͳ࠶ར༻ੑ 001͜ͷ՝Λղܾ͢ΔͨΊͷͷʂʂ άϩʔόϧมΛΘͣʹࡁ·ͤΔΈ ڞ௨αϒϧʔνϯҎ֎ͷ࠶ར༻ΛՄೳʹ͢ΔΈ ߏԽݴޠͷ՝ͱ001ͷࡾେཁૉ ߏԽݴޠͷ՝͓͞Β͍
Ϋϥε ϙϦϞʔϑΟζϜ ܧঝ ϓϩάϥϜͷແବΛল͍ͯ ཧ͢ΔͨΊͷΈ ߏԽݴޠͷ՝Λࠀ͢ΔͨΊʹੜͨͭ͠ͷΈ ߏԽݴޠͷ՝ͱ001ͷࡾେཁૉ 001ͷࡾେཁૉ
001ͷࡾେཁૉΫϥε
001ͷࡾେཁૉ̍Ϋϥε ΫϥεͭͷޮೳΛͭ Ϋϥεʮ·ͱΊͯɺӅͯ͠ɺͨ͘͞Μ࡞ΔʯΈɾޮೳΛͭ ⁞·ͱΊΔ αϒϧʔνϯͱάϩʔό ϧมΛ·ͱΊΔ Ӆ͢ Ϋϥεͷ෦͚ͩͰ͏ มαϒϧʔνϯΛӅ͢ ͨ͘͞Μ࡞Δ
ͭͷΫϥε͔Β ΠϯελϯεΛͨ͘͞Μ࡞Δ
001ͷࡾେཁૉ̍Ϋϥε ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ ϝϦοτ ෦ͷΛݮΒͤΔɻ ϝιουͷ໊લָ͚͕ʹͳΔɻ ϝιου͕୳͘͢͠ͳΔɻ ⁞·ͱΊΔ ෳͷαϒϧʔνϯͱෳͷάϩʔόϧมΛʮ·ͱΊΔʯ
001ͷࡾେཁૉ̍Ϋϥε ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ ϝϦοτ อकੑѱԽͷݩڟͱͳΔάϩʔόϧมΛΘ ͣʹϓϩάϥϜΛॻ͘͜ͱ͕ՄೳʹͳΔ Ӆ͢ Ϋϥεʹఆٛͨ͠มͱϝιουΛଞͷΫϥε͔ΒӅ͢͜ͱ͕Ͱ͖Δɻ QSJWBUFΛ͚ͭΔ͚ͩ +BWB
001ͷࡾେཁૉ̍Ϋϥε ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ ϝϦοτ ಉछͷใΛෳಉ࣌ʹѻ͏Α͏ͳॲཧͷϩ δοΫΛγϯϓϧʹ͢Δɻ ͨ͘͞Μ࡞Δ ఆٛͨ͠Ϋϥε͔Β͍ͭ͘ͰΠϯελϯεΛ࡞Ͱ͖Δɻ
001ͷࡾେཁૉϙϦϞʔϑΟζϜ
001ͷࡾେཁૉϙϦϞʔϑΟζϜ ݺͼग़͢ଆΛڞ௨Խ ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ ϙϦϞʔϑΟζϜ QPMZNPSQIJTN lʮ͍Ζ͍ΖͳܗʹมΘΔʯʮଟଶੑʯʮଟ૬ੑʯ 001ͷϙϦϞʔϑΟζϜ ڞ௨ϝΠϯϧʔνϯΛ࡞ΔͨΊͷΈ
001ͷࡾେཁૉϙϦϞʔϑΟζϜ ίʔυྫ 3VCZ ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ ݺͼग़͢ଆͷϩδοΫΛຊԽ
001ͷࡾେཁૉܧঝ
001ͷࡾେཁૉܧঝ ॏෳ͢ΔΫϥεఆٛΛڞ௨Խ ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ Ϋϥεͷڞ௨෦Λ·ͱΊͯίʔυͷॏෳΛഉআ͢ΔΈ ڞ௨Խ͢ΔϝιουͱΠϯελϯεมΛ εʔύʔΫϥεʹ·ͱΊΔɻ αϒΫϥεͰʮܧঝʯΛએݴ͢Δ
001ͷࡾେཁૉ·ͱΊ ߏԽݴޠͷ՝ w άϩʔόϧม w ශऑͳ࠶ར༻ੑ 001 w ΫϥεʹΑΓϩʔΧϧมͱάϩʔόϧมͷྑ͍ͱ͜औΓΛͨ͠
Πϯελϯεม͕༻Ͱ͖ΔΑ͏ʹͳͬͨɻ ˠάϩʔόϧมͷղܾ w ΫϥεʹΑΓ෦ͷΛݮΒͯ͠શମͷݟ௨্͕͠ɻ w ϙϦϞʔϑΟζϜͱαϒϧʔνϯʹΑΓϩδοΫͷڞ௨Խ͕Մೳʹɻ ˠ͜ΕΒͷΈͷΈ߹ΘͤʹΑΓେنͳ࠶ར༻͕Մೳͱͳͬͨɻ
͞ΒʹਐԽͨ͠001ͷΈ
001ͷΈ Ћ ύοέʔδ ྫ֎ ΨϕʔδίϨΫγϣϯ ʮશମͷݟ௨͠Λྑ͘͢Δʯ ʮ࠶ར༻ଅਐʯ ʮؒҧ͍ࢭʯ ͳͲͷతͰߟҊ͞Εͨɻ 001ͷࡾେཁૉʹՃ͑ͯɺ͞ΒʹਐΜͩػೳ͕༻ҙ͞ΕΔΑ͏ʹͳͬͨɻ
͞ΒʹਐԽͨ͠දతͳͭͷΈ
ΫϥεΛ͞Βʹ·ͱΊΔɻ ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ ΠϝʔδϑΝΠϧΛ֨ೲ͢ΔϑΥϧμ ϝϦοτ w શମͷݟ௨͠Λྑ͘͢Δ w Ϋϥε໊ͷॏෳΛආ͚Δ ͨͩ·ͱΊΔ͚ͩͷೖΕ ΫϥεͱҟͳΓɺϝιουΠϯελϯε
Λఆٛ͢Δ͜ͱͰ͖ͳ͍ɻ 001ͷΈ Ћɿύοέʔδ
Γͱҧ͏ܗࣜͰɺϝιου͔ΒಛผͳΤϥʔΛฦ͢Έ ैདྷ Τϥʔίʔυํࣜ ·Ͱͷ ΤϥʔίʔυͷఆΛશͯॲཧ͠ͳ͚Εͳ Βͳ͍ ˠॻ͖Εؒҧ͍͕͋ΔͱݪҼಛఆ͕ࠔ ಉ͡Α͏ͳϩδοΫ͕αϒϧʔνϯؒͰ࿈ ˠϓϩάϥϜͷϩδοΫ͕Խ
ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ 001ͷΈ Ћɿྫ֎
Γͱҧ͏ܗࣜͰɺϝιου͔ΒಛผͳΤϥʔΛฦ͢Έ ྫ֎ͷΈΛར༻ͨ͠Τϥʔॲཧ ఆॲཧʹؒҧ͍ॻ͖Ε͕͋Δͱ ΤϥʔʹͳΔ ޙॲཧͷඞཁ͕ͳ͍ϝιουͰྫ֎ͷએ ݴ͚ͩͰ0, ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ 001ͷΈ Ћɿྫ֎
ແବΛল͖ɺؒҧ͍Λࢭ͢ΔΈ
ΠϯελϯεΛࣗಈͰআ͢Δɻ ैདྷ ΠϯελϯεΛআ͢ΔॲཧΛ໌ࣔత ʹࢦࣔ͢Δඞཁ͕͋ͬͨɻ ΠϯελϯεΛআ͢ΔॲཧΛγεςϜ͕ ࣗಈతʹ࣮ߦ ΨϕʔδίϨΫγϣϯ ฏᖒষΦϒδΣΫτࢦͰͳͥͭ͘Δͷ͔ୈ൛ 001ͷΈ
ЋɿΨϕʔδίϨΫγϣϯ ϓϩάϥϚΛָʹ͢Δؒҧ͍Λࢭ ͢ΔΈ
͓͠·͍ʹ
001Λ׆͔͢ࡴ͢৺͕͚࣍ୈ େͳ͜ͱɺ ࣭͕ߴ͘ɺอक࠶ར༻͕͍͢͠ϓϩάϥϜΛ࡞Δͱ͍͏త ΦϒδΣΫτࢦͦΕΛ͛͠ΔͨΊͷखஈͰ͔͠ͳ͍ɻ อकੑ ࠶ར༻ੑ Λ͋͛Δʹʁ తΛ࣋ͬͯΦϒδΣΫτࢦΛ ͍͜ͳͦ͏