Lombokハンズオン Javado #02

by Hiroto YAMAKAWA

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-PNCPLϋϯζΦϯ !HJTIJ@ZBNB   IUUQTHJUIVCDPNKBWBEP @TFNJOBS

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HJTIJ@ZBNB ઍࡀࢢͷେֶͰ৘ใγεςϜͷݚڀ։ൃʹैࣄͯ͠·͢  FϥʔχϯάγεςϜͱ͔ɺ஍Ҭͷߦ੓৘ใϙʔλϧͱ͔ʜ "QBDIF8JDLFUͷυΩϡϝϯτ຋༁  ࡳຈͷ+BWBΤϯδχΞίϛϡχςΟʢ+BWB%Pʣ ͓͍͍͠΋ͷେ޷͖Ͱ͢ ͳͲΛ΍ͬͯ·͢

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ࠓ೔ͷ಺༰

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“Project Lombok makes java a spicier language by adding 'handlers' that know how to build and compile simple, boilerplate-free, not- quite-java code.” 1SPKFDU-PNCPL IUUQTHJUIVCDPNS[XJUTFSMPPUMPNCPL Lombok͸Javaʹ’ϋϯυϥ’Λ௥Ճ͢Δ͜ͱͰɺJavaΛؾͷར͍ͨ ݴޠʹ͢ΔΑʂ ϋϯυϥ͸ ɾγϯϓϧͰ ɾϘΠϥʔϓϨʔτʢ͓͖·Γͷॻ͖ํʣΛ·͵͕ΕΔ ɾJavaͬΆ͘ͳ͍ ίʔυʹ͢ΔϏϧυ΍ίϯύΠϧͷํ๏Λ೺Ѳ͍ͯ͠Δ΋ͷͩΑʂ

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public class Cat { private static final Logger log = LoggerFactory.getLogger(Cat.class); private String name; private String voice; private int age; public Cat() { this(null, null, 0); } public Cat(String name, String voice, int age) { this.name = name; this.voice = voice; this.age = age; } public void setName(String name) { this.name = name; } public String getName() { return name; } // ҎԼུ… ຖճ࡞੒͢Δ ͓͖·Γͷίʔυ ʢϘΠϥʔϓϨʔτʣ *%&Ͱ͋Δఔ౓ੜ੒Ͱ͖Δ΋ͷ΋͋Δ͕ɺ໘౗ͳ͜ͱ΋͋ΔΑ

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ͨͱ͑͹ w (FUUFS4FUUFS w FRVBMT IBTIDPEF w σϑΥϧτҾ਺෇͖  ίϯετϥΫλ w 5P4USJOH w OVMMDIFDL w #VJMEFSύλʔϯ w -PHHFS w ม਺ఆٛ w *NNVUBCMF0CKFDU w ஗ԆॳظԽ w FUDʜ -PNCPL͸͜͏͍ͬͨ΋ͷΛΞϊςʔγϣϯͰলུɾઃఆ͢ΔΑ

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ͭ·Γɺ-PNCPLΛ࢖͏ͱʜ ఆܕίʔυ͕૿͕͑ͪͳ෦෼  ʢσʔλɾόϦϡʔΦϒδΣΫτ΍σβΠϯύλʔϯʣ  ͷهࡌΛΞϊςʔγϣϯͰ؆ུԽͰ͖ΔΑ ೥͔Βެ։͞Ε͓ͯΓɺ  ೔ຊޠͷ৘ใ΋͔ͳΓॆ࣮͍ͯ͠ΔΑ ΋͠ձ৔Ͱ࢖͍ͬͯΔํ͕͍Ε͹ϊ΢ϋ΢ͱ͔  ࢖ͬͯΔײΛͲ͠Ͳ͠ڞ༗ͯ͠΄͍͠Α

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-PNCPLͷ͘͠Έ

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public class Cat { private String name; public void setName(String name) { this.name = name; } public String getName() { return name; } } import lombok.Getter; import lombok.Setter; @Getter @Setter public class Cat { // ΞϊςʔγϣϯΛ͚ͭΔͱgetName(), setName(String name) ͕࣮૷͞ΕΔ private String name; } -PNCPLΛ࢖͏ͱʜ

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ˑ؝ٝػ؎ٕ儗ךؙٓأػأח-PNCPLָろת׸גְ׷הծ؝ٝػ؎ ٕ儗ח-PNCPLָⰅ⸂ا٦أؿ؋؎ٕ׾鍑匿׃ג㹀㘗؝٦س׾欰䧭׃׋䖓ծ؝ٝػ؎ٓח床׃תׅկ⚥殛䖞׏גծا٦أ؝٦سٖ كٕדכHFUUFSTFUUFSָ㶷㖈׃זֻג׮ծؙٓأؿ؋؎ٕغ ؎ز؝٦سٖكٕדכHFUUFSTFUUFSָ㶷㖈ׅ׷ךדׅկ˒ )"46/6.",FOKJ 铩׮侄ִגֻ׸זַ׏׋-PNCPLךֿה  IUUQXXXDPQQFSNJOFKQEPDTQSPHSBNNJOHMPNCPLIUNM

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ϋϯζΦϯ

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ਐΊํ TSDNBJOKBWBKBWBEPIBOET0OWBOJMMB  ͷ֤ΫϥεΛ։͖ɺࢦࣔ௨Γʹॻ͖͔͍͑ͯ͘  ʢݱঢ়ͷ-PNCPLΞϊςʔγϣϯΛ͓͓ΉͶ໢ཏ͍ͯ͠·͢ʣ TSDNBJOKBWBKBWBEPIBOET0OVTF-PNCPL  ͷΫϥε͕໛ൣղ౴తͳίʔυ TSDNBJOKBWBTBNQMF͸ɺ  ࣮ࡍʹ࢖͏ͱʜײͷࢀߟʹ͍ͯͩ͘͠͞

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෼ͳͷͰ ͍͔ͭ͘ൈਮͯ͠ ϋϯζΦϯ͠·͢ʂ

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(FUUFS4FUUFS ʢ)BOET0Oʣ

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!(FUUFS !4FUUFS QVCMJDDMBTT)BOET0O\ QSJWBUFTUBUJDOBM-PHHFSMPH -PHHFS'BDUPSZHFU-PHHFS )BOET0ODMBTT QSJWBUF4USJOHJOGP QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0OUBSHFUOFX)BOET0O UBSHFUTFU*OGP 䧭⸆ MPHJOGP UBSHFUHFU*OGP ^ ^ ͜ͷଞɺ(FUUFSͷεϨουηʔϑͳ஗ԆॳظԽ(FUUFSͳͲ΋Մೳ  ʢྫɿ)BOET0Oʣ (FUUFS4FUUFS͕࡞੒͞Εར༻Ͱ͖Δʂ

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/VMMνΣοΫ ʢ)BOET0OBʣ

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!(FUUFS !4FUUFS QVCMJDDMBTT)BOET0OB\ QSJWBUFTUBUJDOBM-PHHFSMPH -PHHFS'BDUPSZHFU-PHHFS )BOET0OBDMBTT !/PO/VMM QSJWBUF4USJOHJOGP QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0OBUBSHFUOFX)BOET0OB UBSHFUTFU*OGP 䧭⸆ MPHJOGP UBSHFUHFU*OGP USZ\ UBSHFUTFU*OGP OVMM ^DBUDI /VMM1PJOUFS&YDFQUJPOF \ MPHJOGP OVMMثؑحؙ׮䧭⸆ ^ ^ ^ ͜ͷଞɺύϥϝʔλͷOVMMνΣοΫ΋Մೳʢྫɿ)BOET0OCʣ 4FUUFSͰOVMMνΣοΫʂ

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-PH ʢ)BOET0Oʣ

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!4MGK !(FUUFS !4FUUFS QVCMJDDMBTT)BOET0O\ QSJWBUF4USJOHJOGP QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0OUBSHFUOFX)BOET0O UBSHFUTFU*OGP 䧭⸆ MPHJOGP UBSHFUHFU*OGP ^ ^ MPHͷΫϥεม਺͕҉໧తʹ࡞੒͞ΕΔʂ

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ରԠ͢Δ-PHHFSͷछྨ w !$PNNPOT-PH  PSHBQBDIFDPNNPOTMPHHJOH-PH w !-PH  KBWBVUJMMPHHJOH-PHHFS w !-PHK  PSHBQBDIFMPHK-PHHFS w !-PHK  PSHBQBDIFMPHHJOHMPHK-PHHFS w !4MGK  PSHTMGK-PHHFS w !94MGK  PSHTMGKFYU9-PHHFS ͢΂ͯɺQSJWBUFTUBUJDpOBMͳ  Ϋϥεม਺ͱͯ͠ॳظԽ͞ΕΔ

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ίϯετϥΫλ ʢ)BOET0OBʣ

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!4MGK !"MM"SHT$POTUSVDUPS !(FUUFS QVCMJDDMBTT)BOET0OB\ QSJWBUF4USJOHJOGP QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0OBUBSHFUOFX)BOET0OB 䧭⸆ MPHJOGP UBSHFUHFU*OGP ^ ^ ͜ͷଞɺpOBM !/PO/VMM ͳϑΟʔϧυͷͨΊͷҾ਺͖ͭίϯε τϥΫλ΍ɺσϑΥϧτίϯετϥΫλɺϑΝΫτϦϝιου΋ ࡞੒Մೳʢྫɿ)BOET0OC )BOET0Oʣ ϑΟʔϧυͷҾ਺͖ͭίϯετϥΫλ͕ ҉໧తʹ࡞੒͞ΕΔʂ

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UP4USJOH ʢ)BOET0Oʣ

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!4MGK !"MM"SHT$POTUSVDUPS !5P4USJOH QVCMJDDMBTT)BOET0O\ QSJWBUF4USJOHOBNF QSJWBUF4USJOHTUBUF QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0OUBSHFUOFX)BOET0O +BWB%P 劦䌽 MPHJOGP UBSHFUUP4USJOH ^ ^ */'0KBWBEPIBOET0OVTF-PNCPL)BOET0O )BOET0O OBNF+BWB%P TUBUFࡳຈ UP4USJOH ͕ϑΟʔϧυͷঢ়ଶΛจࣈྻͰฦ͢

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FRVBMTIBTI$PEF ʢ)BOET0Oʣ

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!4MGK !"MM"SHT$POTUSVDUPS !&RVBMT"OE)BTI$PEF !(FUUFS QVCMJDDMBTT)BOET0O\ QSJWBUF4USJOHOBNF QSJWBUF4USJOHTUBUF QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0OUBSHFUOFX)BOET0O +BWB%P 劦䌽 )BOET0OUBSHFUOFX)BOET0O +BWB%P 劦䌽 MPHJOGP UBSHFUUBSHFUUP4USJOH MPHJOGP UBSHFUUBSHFUUP4USJOH MPHJOGP DPOUBJOTUBSHFUFRVBMT UBSHFU ^ ^ ΦϒδΣΫτ͕஋ҰகͰൺֱͰ͖Δ FRVBMT IBTI$PEFͷத਎͕࡞੒͞ΕΔʣ

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'JFME%FGBVMUT ʢ)BOET0Oʣ

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!4MGK !"MM"SHT$POTUSVDUPS !&RVBMT"OE)BTI$PEF !(FUUFS !5P4USJOH !'JFME%FGBVMUT NBLF'JOBMUSVF MFWFM"DDFTT-FWFM13*7"5& QVCMJDDMBTT)BOET0O\ 4USJOHOBNF 4USJOHTUBUF QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0OUBSHFUOFX)BOET0O +BWB%P 劦䌽 )BOET0OUBSHFUOFX)BOET0O +BWB%P 劦䌽 MPHJOGP UBSHFUUBSHFUUP4USJOH MPHJOGP UBSHFUUBSHFUUP4USJOH MPHJOGP DPOUBJOTUBSHFUFRVBMT UBSHFU ^ ^ ΞΫηεम০ࢠ͕ແ͍͚ΕͲ΋ QSJWBUF pOBM

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7BMVF %BUB ʢ)BOET0O )BOET0Oʣ

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!7BMVF w όϦϡʔΦϒδΣΫτ༻ͷ-PNCPLΞϊςʔγϣϯΛ·ͱΊͯ෇༩  5P4USJOH  &RVBMT"OE)BTI$PEF  "MM"SHT$POTUSVDUPS  'JFME%FGBVMUT NBLF'JOBMUSVF MFWFM13*7"5&ʣ  (FUUFS

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!%BUB w σʔλΦϒδΣΫτ༻ͷ-PNCPLΞϊςʔγϣϯΛ·ͱΊͯ෇༩  5P4USJOH  &RVBMT"OE)BTI$PEF  3FRVJSFE"SHT$POTUSVDUPS  (FUUFS  4FUUFS

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pOBMͳϩʔΧϧม਺WBM ʢ)BOET0Oʣ

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!4MGK !"MM"SHT$POTUSVDUPS !%BUB QVCMJDDMBTT)BOET0O\ QSJWBUF4USJOHOBNF QSJWBUF4USJOHTUBUF QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ WBMKVHT4USFBNPG OFX)BOET0O +BWB%P 劦䌽 OFX)BOET0O 幪靼+BWB 匌❨ OFX)BOET0O +BWB⹈䓼⠓JO猧衝⾱匌❨ OFX)BOET0O ꟼآٍغ 㣐ꢻ OFX)BOET0O 䀤㿊+BWBِ٦ؠ⠓ 䀤㿊 OFX)BOET0O 䎢䃊+6( 䎢䃊 OFX)BOET0O 擓劤+BWB⹈䓼⠓ 擓劤 DPMMFDU $PMMFDUPSTUP-JTU KVHTTUSFBN GPS&BDI JUFNMPHJOGP JUFNUP4USJOH ^ ม਺͕ࢀর͢ΔΦϒδΣΫτܕͰ pOBMͳϩʔΧϧม਺Λ࡞੒ʂ ʢ5ZQF4DSJQUͷWBMͱಉ͡ʣ  Լͷ৔߹ɺKVHTͷܕ͸-JTU)BOET0O

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#VJMEFSύλʔϯ ʢ)BOET0Oʣ

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!4MGK !5P4USJOH !#VJMEFS QVCMJDDMBTT)BOET0O\ QSJWBUF4USJOHOBNF !4JOHVMBS QSJWBUF-JTU4USJOHTFNJOBST QVCMJDTUBUJDWPJENBJO 4USJOH<>BSHT \ )BOET0O#VJMEFSCVJMEFS)BOET0OCVJMEFS )BOET0OUBSHFSCVJMEFSOBNF +BWB%P TFNJOBS "QBDIF8JDLFU TFNJOBS 4USFBN-BNCEB TFNJOBS XBLF TFNJOBS MPNCPL CVJME MPHJOGP UBSHFSUP4USJOH ^ !#VJMEFSΛ͚ͭΔ͚ͩͰ #VJMEFSύλʔϯΛ࣮૷Մೳʂ !4JOHVMBS͸$PMMFDUJPOม਺Λ  ݸͣͭ௥ՃͰ͖ΔΑ͏ʹ͢Δ

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ͦͷ΄͔

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w !6UJMJUZ$MBTT  ΠϯελϯεԽͷ཈੍ʢ)BOET0Oʣ w !$MFBOVQ  $MPTBCMFͳΦϒδΣΫτͷࣗಈDMPTFʢ)BOET0Oʣ w !4ZODISPOJ[FE  ฒྻॲཧ༻ͷTZODISPOJ[FEϒϩοΫ࡞੒ʢ)BOET0Oʣ w !8JUI  JNNVUBCMFΦϒδΣΫτ༻ͷXJUIϝιου࡞੒ʢ)BOET0Oʣ w !"DDFTTPST  HFUUFSTFUUFSͷϝιουνΣʔϯԽɺ'MVFOUΠϯλʔϑΣʔε తͳ໊শઃఆʢ)BOET0Oʣ

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ͱ͜ΖͰ

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-PNCPLΛ ࠇຐज़ͱ͍͏ਓ΋ଟ͍ʜʜ

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ݸਓతʹࠇຐज़ײ͕ڧ͍ͱࢥ͏΋ͷ w !&YUFOTJPO.FUIPE  ม਺ͷܕΛΩʔʹͨ͠TUBUJDϝιουͷม਺΁ͷ݁߹ʢ)BOET0Oʣ w !%FMFHBUF  ϝιουॲཧͷϑΟʔϧυΦϒδΣΫτ΁ͷҕৡʢ)BOET0Oʣ w !4OFBLZ5ISPXT  νΣοΫྫ֎ͷඇνΣοΫྫ֎Խʢ)BOET0Oʣ w !)FMQFS  ϔϧύʔΫϥεͷΠϯελϯεԽলུʢ)BOET0Oʣ w PO)PHF!@@ !1JZP   Ξϊςʔγϣϯͷ෇༩ʢ)BOET0Oʣ 

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ܹਏΑΓ தਏɾਏޱ͋ͨΓͰ ੍ޚͯ͠࢖ͬͨํ͕ ΦΠγΠʂ

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උߟ w -PNCPLΞϊςʔγϣϯͰੜ੒͞ΕΔίʔυͱ  ࣮ࡍʹϓϩάϥϜ͞Εͨίʔυ͕ඃͬͨͱ͖͸ɺ  ݪଇɺϓϩάϥϜ͞Εͨίʔυ͕༏ઌ͞ΕΔ w MPNCPLFYQFSJNFOUBMύοέʔδʹଘࡏ͢Δ΋ͷ͸ɺ ެࣜݟղʹ͸ςετ൛ʢ࢖͑ͳ͍Θ͚Ͱ͸ͳ͍ʣ w *%&ͱ͔Έ߹Θ͕ͤѱ͍෦෼͸Ͳ͏ͯ͠΋͋Δ  ʢWBM͕ಛʹτϥϒΔײʣ

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·ͱΊ -PNCPLΛར༻͢Δ͜ͱͰɺ+BWBͷϘΠϥʔϓϨʔτͳίʔυ ͷ؆ུԽʢίʔυྔͷݮগɺه๏౷ҰʹΑΔϛεͷܰݮʣΛૂ ͑Δɻ #FBOͳͲͷσʔλΦϒδΣΫτ΍ɺόϦϡʔΦϒδΣΫτͷੜ ੒ɺσβΠϯύλʔϯͷ࣮૷ʹޮՌΛൃش͠΍͍͢ɻ *%&ͱͷ૬ੑ໰୊ɺҰׅม׵ػೳͳͲͱͷτϨʔυΦϑ͸ඞཁɻ ҆ఆͯ͠࢖͑ΔΞϊςʔγϣϯ͔Βͷಋೖ͕Φεεϝɻ  ࠇຐज़తͳॴ΍ɺࠞཚͦ͠͏ͳॴ͸ແཧͤͣʹɻ

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࣍ճ༧ࠂ 4QSJOH#PPUຊͱ͔ +6OJU࣮ફೖ໳ຊͱ͔  ڭՊॻʹͨ͠ ϋϯζΦϯͱ͔ʜʁ