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Javaはじめのいっぽ(202107社内勉強会)
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shimadamiyuki
July 15, 2021
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Javaはじめのいっぽ(202107社内勉強会)
月一で実施している社内勉強会の資料です(2021.07)
shimadamiyuki
July 15, 2021
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Transcript
+BWB͡Ίͷ͍ͬΆ νʔϜձ
+BWBͬͯͳʹʁ ◦ ݄ੜ·Ε ◦ αϯɾϚΠΫϩγεςϜζࣾʹΑͬͯ։ൃ͞Εͨ ◦ ʹαϯɾϚΠΫϩγεςϜζ͕0SBDMFʹങऩ͞Ε ͨͷͰɺ͍·0SBDMF͕+BWBͷඪΛ࣋ͬͯΔ ◦ +%,ͷ։ൃதʹ044Խ͞Εͨ
+%, +BWB%FWFMPQNFOU,JU ͬͯʁ ◦ +BWBΛ։ൃͨ͠Γ࣮ߦͨ͠Γ͢Δͱ͖ʹඞཁʹͳΔ։ൃΩοτͷ͜ͱ ◦ 044Ͱ։ൃ͞Εͨιʔείʔυʢ0QFO+%,ʣΛͱʹɺ࣮ࡍʹίϯϐϡʔλʹΠϯετʔ ϧͯ͑͠Δܗʹͨ͠ͷΛɺ͍ΖΜͳاۀʢ+%,ϕϯμʣ͕ఏڙͯ͘͠Ε͍ͯΔΑ ◦ ͦΕͧΕಘҙαϙʔτʹҧ͍͕͋Δ͚ͲɺΑ͘Θ͔Μͳ͍͚ͲͱΓ͋͑ͣࣗͷ1$
Ͱ+BWBͷ͓ษڧΛ͍ͨ͠Αɺͱ͍͏ਓ0SBDMF0QFO+%,Λ͓͚ͬͯϕλʔ IUUQTHJUIVCDPNPQFOKEL
+BWBͷόʔδϣϯͲ͏ͳͬͯΔͷʁ +BWB +BWB +BWB +BWB +BWB +BWBʙ·Ͱ ͝ͱʹϦϦʔε ˞+BWB Yਖ਼໊ࣜশͰͳ͍Ͱ͕͢ɺ͜͜Ͱศٓతʹͦ͏ݺΜͰ·͢
+BWB +BWB +BWB +BWB +BWB +BWB
+BWBͷϦϦʔεαΠΫϧ ◦ +BWB͔Β͝ͱͷఆظϦϦʔεʹมΘΓ·ͨ͠ ◦ ৽͍͠ػೳͷϦϦʔεͷεϐʔυ্͕͕Δʂ͓ࢼ͠ػ ೳ͕ೖΕΒΕΔʂ ◦ ʹճɺ-54 -POH5JNF4VQQPSU ൛ͱݺΕΔα
ϙʔτظ͕͍ؒόʔδϣϯ͕ϦϦʔε͞Ε·͢ όʔδϣϯ ϦϦʔε +BWB -54 +BWB +BWB +BWB -54 +BWB +BWB +BWB +BWB +BWB +BWB -54
͔͜͜Βͪΐͬͱ+BWBͯ͠Έ·͢ ◦ϓϩδΣΫτ ◦Ϗϧυπʔϧ ◦ϑϨʔϜϫʔΫ
·ͣ+BWBΛ Πϯετʔϧ͢Δ ࣗͷ1$Ͱ+BWBΛ͑ΔΑ͏ʹ͢Δʹ͍͔ͭ͘Γํ͕͋ΔΑ ◦ ཧπʔϧΛͬͯ+%,ΛΠϯετʔϧͯ͠͏ ˠ.BDͳΒ͕͓ͬͪ͜͢͢Ί ◦ ϕϯμʔʢ+%,Λఏڙͯ͘͠ΕΔاۀʣͷ8FCαΠτ͔Β+%,Λμ ϯϩʔυͯ͠͏ ˠ8JOEPXTͳΒ͕͓ͬͪ͜͢͢Ί
ཧπʔϧΛ͏ ◦ .BDͰ+BWBΛ͍͍ͨͳΒ4%,."/ IUUQTTELNBOJP ͱ͍͏πʔϧ͕ศར ͍ΖΜͳ+%,ΛΠϯετʔϧͯ͠Γସ͑ͯ͑Δ .BD 8JOEPXTͰ4%,."/Λ͍͍ͨ߹ɺʮ$ZHXJOʯͱ͍͏πʔϧΛ௨ͤҰԠ͍͚·͢ɻ ʢ $ZHXJOɿ8JOEPXTͰ-JOVYίϚϯυΛ͑ΔΑ͏ʹ͢ΔͨΊͷͷʣ
IUUQTHJUIVCDPNKBWBXPNFO)FMMP8PSME)BOET0OCMPCNBTUFS1*5$).&NE
◦ 4%,."/ͷJOTUBMMϖʔδʹ ΞΫηε IUUQTTELNBOJPJOTUBMM ◦ λʔϛφϧΛ։͍ͯɺॻ͔ Ε͍ͯΔίϚϯυΛॱ൪ʹ ࣮ߦ͢Δ ◦ λʔϛφϧͰTEL
WFSTJPOɺ ͱ࣮ߦͯ͠ɺ 4%,."/ɾɾɾͷද͕ࣔग़ Ε0, .BD
ࢦఆͨ͠+%,ΛΠϯετʔϧ͢Δ TEL JOTUBMMKBWB Πϯετʔϧ͍ͨ͠+%,ͷ໊લ ΠϯετʔϧͰ͖Δ+%,ͷҰཡΛݟΔ TEL MJTUKBWB -JTUͰग़͖ͯͨҰཡͷɺ͜͜ʹॻ͍ͯ͋Δ໊લΛࢦఆ͢Δɻ Ұ൪ࠨͷྻʢ7FOEFSʣ͕+BWBOFUͰɺ͍͍ͨόʔδϣϯͷ ͷΛબ0,
.BD
ࠓΠϯετʔϧͨ͠+BWBΛσϑΥϧτʹ͠·͔͢ʁͱฉ͔ΕͨΒɺ :ʢ:FTʣͱ͓͚͑ͯɺύεΛ௨͢ʢ+BWBΛ͑ΔΑ͏ʹ͢Δʣͱ͜Ζ·Ͱͬͯ͘ΕΔ Πϯετʔϧ͍ͯ͠Δͱ͜Ζ .BD
8JOEPXTͷ߹4%,."/Λ͏ͷʹ৭ʑ४උ͕ඞཁͰΊΜͲ͍͘͞ͷͰɺ +BWBOFUʢIUUQKELKBWBOFUʣ͔Β+%,ΛΠϯετʔϧ͢Δ 8JOEPXT ͔͜͜Β͍͍ͨόʔδϣϯΛબͿ ϕϯμʔͷαΠτ͔Βμϯϩʔυ
8JOEPXT൛ΛબΜͰμϯϩʔυͯ͠ɺ1$ͷదͳॴʹ[JQΛల։͢Δɻ ʢ$=ʹͦͷ··ஔ͍ͪΌ͏ͱ͔ɺ$=ʹKBWBXPSLΈ͍ͨͳϑΥϧμΛ࡞ͬͯͦͷதͱ͔ʣ 8JOEPXT
μϯϩʔυͨ͠+%,͕͑ΔΑ͏ʹɺύεΛ௨͢ʢڥมʹઃఆ͢Δʣɻ 8JOEPXTͷɺγεςϜͷϓϩύςΟʼৄࡉઃఆλϒʼڥมϘλϯ͔Βɺ ڥมͷઃఆը໘Λදࣔ͢Δɻ Ϣʔβʔڥมͷ৽نϘλϯΛԡ͢ɻ Լهͷ௨Γೖྗͯ͠0,Λԡ͢ɻ ม໊ +"7"@)0.& ม
ల։ͨ͠+%,ͷϑΥϧμΛࢦఆ͢Δʢྫ $=XPSL=KELʣ 8JOEPXT ίϚϯυϓϩϯϓτͰ KBWBrWFSTJPO ͱ࣮ߦͯ͠ɺ+BWBͷόʔδϣϯ͕දࣔ͞ΕΕ0,ɻ
+BWBΛͬ͞͞ͱॻ͍ͯ ಈ͔ͯ͠ΈΔ +BWBͷϓϩάϥϜΛͪΐͬͱॻ͍ͯಈ͔͍͚ͨ͠ͲɺΊΜͲ͍͘͞ ͷ͍ͩɾɾɾ ͱࢥͬͨΒɺ͜Μͳํ๏͕͋ΔΑɻ +4IFMMʢ+BWBҎ߱ʣ +BWBͷιʔεϑΝΠϧΛ࣮ߦʢ+BWBҎ߱ʣ
+BWBͷιʔεϑΝΠϧΛίϯύΠϧ࣮ͯ͠ߦ
+4IFMM +BWBΛॻ͍࣮ͯߦ͕͙͢Ͱ͖Δศརͳͭɻ λʔϛφϧʢίϚϯυϓϩϯϓτʣͰ KTIFMM Λ࣮ߦ͢Δ͚ͩͰىಈ͢ΔΑɻ
ͬͯΈΔͱ͜Μͳײ͡ɻมΫϥεͷએݴͰ͖ΔΑɻ IFMQͱೖྗ͢Δͱ+4IFMMͰͰ͖Δ͜ͱͷҰཡ͕ݟΒΕΔΑɻऴྃ͢Δͱ͖ FYJU
+BWBͷιʔεϑΝΠϧ͔Β࣮ߦ ॻ͍ͨ+BWBͷίʔυΛಈ͔͢ʹຊίϯύΠϧ͠ͳ͍ͱ͍͚ͳ͍͚Ͳɺ ίϯύΠϧͱ͔ΊΜͲ͍͘͞ਓͷͨΊʹɺιʔεϑΝΠϧݸ͚ͩͳΒͦͷ··࣮ߦͰ͖ΔΑɻ
λʔϛφϧʢίϚϯυϓϩϯϓτʣΛ։͍ͯɺ KBWB࡞ͬͨϑΝΠϧ໊ ʢྫɿKBWB)FMMPKBWBʣ ͱೖྗ͢ΕɺϑΝΠϧʹॻ͍ͨ+BWBͷιʔείʔυ͕࣮ߦ͞ΕΔΑɻ ·ͣιʔεϑΝΠϧΛ࡞Γ·͢ɻ ৽͍͠ϑΝΠϧΛ࡞ͬͯɺԼͷࠇͷதΛίϐϖͯ͠Ͷɻ Ϋϥε໊ʢ)FMMPʣࣗ༝ʹ͚ͭͯͶɻϑΝΠϧ໊Ϋϥε໊KBWBʹ͢ΔΑɻ QVCMJDDMBTT)FMMP\ QVCMJDTUBUJDWPJENBJO 4USJOHBSHT
\ ͜͜ʹ࣮ߦ͢Δ༰Λॻ͘Α 4ZTUFNPVUQSJOUMO )FMMP8PSME ^ ^
+BWBͷιʔεϑΝΠϧΛίϯύΠϧ࣮ͯ͠ߦ ͜Ε͕ਖ਼͍͠ʢΊΜͲ͕͘͞Βͳ͍ʣ+BWBͷಈ͔͠ํͩʂ લͷϖʔδͰ࡞ͬͨϑΝΠϧΛ͏Ұ͏Αɻ λʔϛφϧίϚϯυϓϩϯϓτͰɺ KBWBD ࡞ͬͨϑΝΠϧ໊ ʢྫɿKBWBD )FMMPKBWBʣ ͱ࣮ߦͯ͠Ͷɻ KBWBD+BWBͷιʔεϑΝΠϧΛίϯύΠϧ͢ΔͨΊͷίϚϯυͩΑɻ
ਖ਼࣮͘͠ߦͰ͖ΕɺKBWBDΛ࣮ߦͨ͠σΟϨΫτϦʹ DMBTTͱ͍͏֦ுࢠͷΫϥεϑΝΠϧʢ)FMMPDMBTTʣ͕Ͱ͖͍ͯΔΑɻ
͏ҰλʔϛφϧͰɺࠓϑΝΠϧ໊Ͱͳ͘ιʔεʹॻ͍ͨΫϥε໊Λࢦఆͯ͠ɺ KBWBΫϥε໊ʢྫɿKBWB)FMMPʣ ͱ࣮ߦ͢ΕɺιʔεϑΝΠϧʹॻ͍ͨ+BWBͷϓϩάϥϜ͕࣮ߦ͞ΕΔΑɻ
$)".1*0/ :06"3&5)& ͬͨʔ +BWBͰ͖ͨʂ
ݩؾ͕ग़ͨΒଓ͖Λॻ͘Α ɾ*%&Λͬͯ։ൃͯ͠ΈΑ͏ ɾϏϧυπʔϧΛͬͯΈΑ͏ʢ.BWFO(SBEMFʣ ɾ4QSJOHͬͯͳΜͳͷʁ ɾ4QSJOH*OJUJBMJ[FSΛͬͯ4QSJOHͷ1SPKFDUΛ࡞ͬͯΈΑ͏