Javaの新定石 - Speaker Deck

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+BWBͷ৽ఆੴ LBOKBWB !JSPG

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+BWBͷ৽ఆੴ 8&#%#13&44Ͱ࿈ࡌதɻ ʮϞμϯ+BWB࠶ೖ໳ʯ͕اը ࣌ͷλΠτϧͰͨ͠ɻ

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7PM ճ

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ίϯηϓτ ݱ৔ಛԽ ࣗ෼͕࣮ͨͪࡍ΍ͬͯΔ͜ͱ ͚ͩॻ͘

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࿈ࡌͷର৅ಡऀ ͋Δఔ౓ܦݧΛੵΜͰΔΤϯ δχΞ Ϟμϯͳ͜ͱʹڵຯ͸͋Δ Ͱ΋๩ͯ͘͠ɾɾɾ

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λʔήοτରൺ

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֤ճςʔϚ

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+BWB΁ͷҠߦ ϚϧνεϨου($ +BWB&& "TTFSU+ %PNB %BUFBOE5JNF"1*  (SBEMF '1 4FMFOJEF 5IZNFMFBG ֎෦ڥքςετ ςετμϒϧ

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ϥΠϒϥϦ ϑϨʔϜϫʔΫ +BWBඪ४ϥΠϒϥϦ ςετ ؀ڥ

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+BWBΛ׆͔͢ ίʔυ΁ͷҠߦ ΋͏+BWBͰͯΔ

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+BWBͷϚΠάϨʔγϣϯ औΓ্͛ͨཁૉ 1SPKFDU$PJO /*0 1SPKFDU-BNCEB

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ʢݩͷ··Ͱ΋ͦΜͳѱ ͘ͳ͍ΜͩΑͳ͊ʜʜʣ

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ϚϧνεϨουʗ($ ͱͷ෇͖߹͍ํ

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ϚϧνεϨουʹศ৐ͯ͠ ʮΠϛϡʔλϒϧαΠίʔʯ ($ʹศ৐ͯ͠ʮ୹໋Πϯελ ϯεαΠίʔʯ

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࠷৽+BWB&&Ͱ ͔ΜͨΜ8FC։ൃ

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4QSJOH#PPUͱ+BWB&&Ͱೋ ୒ͷ࣌ظɻ ݱ৔Ͱ࢖ͬͯͨͷ͸+BWB&&ͩ ͚ͩͬͨΜͩΑʂ

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+"934 +1" $%* +5" +41 4FSWMFU 6CFS+"3

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ϖʔδͰ΄ͱΜͲ୺ંΒͣઆ ໌Ͱ͖ͨ+BWB&&͸ɺͳΜͩ ͔ΜͩͰ͍͢͝ɻ ࠓɺಉ͜͡ͱΛ4QSJOH#PPU Ͱॻ͍ͯ΋ଟ෼େࠩͳ͍ɻ

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"TTFSU+ͰҰาਐΜͩ ςετίʔυ

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ศ৐ͯ͠TUBUJDΠϯϙʔτ͕ݏ ͍ͬͯॻ͖·ͨ͠ɻ ͦΕҎ֎͸ૉ௚ͳ"TTFSU+ͷ࢖ ͍ํ঺հͰ͢ɻ

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%PNBͰϛεͳ͘ %#ΞΫηε

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ࢲ͸͜ΕͰ%PNBษڧ͠·͠ ͨʂʂ

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+BWBͰ௚ײతͳ ೔෇ʗ࣌ࠁૢ࡞ ͔͜͜Βॴଐͳ͠ʹͳͬͨˠ

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%BUF 5JNF %BUF5JNF %VSBUJPO *OTUBOU

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ްΊʹॻ͍ͨͱ͜Ζ Α͘࢖͏ʮ-PDBMʯ ݱ৔Ͱ೰Ήʮม׵ʯ %BUF$BMFOEBS ֎෦ʢ%#+40/จࣈྻʣ

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࣮ફʂ ΠϚυΩͷϏϧυ؀ڥ

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ϓϩδΣΫτΛͲͷΑ͏ͳߏ ੒ʹ͢Δ͔ ϥΠϒϥϦΛͲ͏؅ཧ͢Δ͔ ϏϧυπʔϧʹԿΛظ଴͢Δ ͔

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(SBEMF*%&"Ͱ΍ͬͯ·͢ .BWFO&DMJQTFͰ΋Ͱ͖ͳ͘ ͸ͳ͍ʢ͚Ͳͪΐͬͱ໘౗ ϚϧνϞδϡʔϧߏ੒͸ࠓޙ ૿͍͑ͯ͘ͱࢥ͍·͢

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0QUJPOBM4USFBN దࡐదॴ

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0QUJPOBM4USFBN࠷ߴʂʂ ͬͯ΍ͭͰ͸ͳ͍Ͱ͢ɻ ʮ΍Ίͱ͚ʯͱʮ஫ҙ͠Ζʯ

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+BWBͰଟগϚγʹ͸ͳͬͨ ʢ͸ͣʣ Ͱ΋ʮదࡐదॴʯ͸มΘΓ· ͤΜΑ

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4FMFOJEFͰ ϒϥ΢βࣗಈςετ

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IUUQTCBDLQBQFSHJUIVCJP HIPTUTUSZTFMFOJEF

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୤ߘޙʹʮ݄Ͱ4FMFOJVN *%&ͳ͘ͳΔ͔ΒXXʯͱ͔ൃ ද͋ͬͯযͬͨɻ

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4FMFOJEFʹศ৐ͯ͠ʮγες ϜςετࣗಈԽඪ४ΨΠυʯ ͷ঺հͱ͔ͯ͠Δɻ ͋ͱ4QSJOH#PPUͱ͔EPDLFS ͱ͔ͷ࿩΋ೖͬͯΔɻ

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ςϯϓϨʔτΤϯδϯ 5IZNFMFBG

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௝͘͠ૉ௚ͳ঺հΛͨ͠ճͰ ͢ɻ͋·Γศ৐ͯ͠ॻ͘͜ͱ ͳ͔ͬͨɻ

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ڧௐͯ͠Δ͜ͱ 5IZNFMFBG࢖͏ͳΒφνϡϥ ϧςϯϓϨʔτҙࣝ͠Α͏ Ͷɻ

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֎෦ڥքͷςετ

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+7.಺෦ͳΒͳΜͱͰ΋ͳΔ ͚Ͳɾɾɾͱ͍͏+7.಺หܚ ޲͚ͷ͓࿩ɻ )ͱ4VC&UIB4.51Λ+6OJU ͔Β࢖ͬͯ঺հͯ͠·͢ɻ

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.PDLJUPʹΑΔ ςετμϒϧೖ໳

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ςετμϒϧ IUUQYVOJUQBUUFSOTDPN5FTU%PVCMFIUNM

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.PDLJUPʹศ৐ͯ͠ςετμϒ ϧͷϙΤϜॻ͖·ͨ͠ɻ ͋ɺݱ৔Ͱ஫ҙ͢Δ͜ͱͱ͔ ϋϚΓྫ΋ͪΌΜͱॻ͍ͯ· ͢ɻ

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ͬͯ͜ͱͰങͬͯ͘ ͍ͩ͞