これからのJavaのとっかかりを掴む

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͜Ε͔Βͷ+BWBͷ ͱ͔͔ͬΓΛ௫Ή ळͷؔδϟόࡇΓ LBOKBWB !JSPG +BWB%BZ5PLZP KEU !JSPG

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+BWBΤϯδχΞཆ੒ಡຊ  +BWBೖ໳ ։ൃݱ৔ʹ఻͍͑ͨͷ͜ͱ  ಓ۩ʹؔ͢ΔΑ͠ͳ͠͝ͱ ؔ੢+BWBΤϯδχΞͷձ @irof IPHFۦಈ ϨϏϡΞʔ

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͜Ε͔Β͢Δ࿩ ͜Ε·Ͱͷ+BWBΛৼΓฦͬͯ ͍·Ͳ͖ͷ+BWBͷ଍৔ݻΊ ͜Ε͔Βͷ+BWBͷͱ͔͔ͬΓ ˞ϓϩάϥϚ޲͚

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͠ͳ͍࿩ +BWBҎ߱ͷ۩ମతͳ࿩

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͜Ε·Ͱͷ+BWBΛ ৼΓฦͬͯ ͜Ε·Ͱͷ+BWB+BWB4&͋ͨΓ

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ʮ͜Ε·Ͱʯ ʹؚ·ΕΔ΋ͷ δΣωϦΫε FOVN ֦ுGPS Ξϊςʔγϣϯ $PODVSSFODZ6UJMJUJFT

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͜Ε·Ͱͷ+BWBΛΠϝʔδͰ࿩͠·͢ ˞ݸਓͷײ૝Ͱ͢

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+BWBݴޠ

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+BWBݴޠ ݎ͍ۤ͠ ੩తܕ෇͚ΦϒδΣΫτࢦ޲ݴޠ ৑௕ͳߏจ ྼԽ999ݴޠ อकత ݹष͍ ख͕ؒଟ͍ ਐԽ͕஗͍ ॲཧ͕஗͍ ىಈ͕஗͍ Α͘࢖ΘΕ͍ͯΔ ϙετ$0#0- Ϋϥεϕʔε

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+BWB؀ڥ

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+BWB؀ڥ ࣮੷ࣄྫ͕ଟ͍ ԯͷσόΠεͰಈ͘ +7. αʔόʔ͔ΒϞόΠϧ·Ͱ +7.ݴޠ ৘ใ͕ಘ΍͍͢ ๲େͳϥΠϒϥϦ΍ ϑϨʔϜϫʔΫ ॆ࣮ͨ͠։ൃπʔϧ Φʔϓϯιʔε

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͜Ε·Ͱͷ+BWBͷΠϝʔδ ݴޠ͸Α͘࢖ΘΕ͍ͯΔ ҰํͰωΨςΟϒͳҹ৅΋ڧͦ͏ ؀ڥ͸جຊతʹϙδςΟϒͳײ͡

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Ҏ্͕z͜Ε·Ͱzͷ࿩

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+BWB͸มΘ͍ͬͯ·͢ ʢͨͿΜʣ

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͍·Ͳ͖ͷ+BWBͷ ଍৔ݻΊ

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͍·Ͳ͖ͷ+BWBݴޠ ͍·Ͳ͖ͷ+BWB+BWB +BWB ίʔυͱͱ΋ʹ͓͞Β͍ɻ

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+BWBϐοΫΞοϓ +BWB4& +43 1SPKFDU$PJO +43 /*0 +43

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+431SPKFDU$PJO USZXJUISFTPVSDFT EJBNPOEPQFSBUPS $PJOͰ΋Α͘࢖͏΋ͷ

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USZXJUISFTPVSDFT Closeable resource = create();  try {  // resource Λ࢖͏ॲཧ...  } finally {  resource.close();  } try (AutoCloseable resource = create()) {  // resource Λ࢖͏ॲཧ...  }

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EJBNPOEPQFSBUPS Map>> map  = new HashMap>>();  Map>> map  = new HashMap<>();

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ଞͷ$PJOͨͪ όΠφϦϦςϥϧ ਺஋ϦςϥϧͷΞϯμʔείΞ 4USJOHTTXJUDI ϚϧνΩϟον

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ଞͷ$PJOͨͪ όΠφϦϦςϥϧ ਺஋ϦςϥϧͷΞϯμʔείΞ 4USJOHTTXJUDI ϚϧνΩϟον Ϧςϥϧ ͋Μ·Γ ॻ͔ͳ͍

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4USJOH4XJUDI switch (str) {  case "java":  // ...  break;  case "groovy":  // ...  break;  default:  // ...  } OVMM͜Θ͍ CSFBLΊΜͲ͍ JGͰॻ͘ΑΓ  ߦ਺ଟ͍

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ϚϧνΩϟον try {  this.getClass().getMethod("method").invoke(this);  } catch (IllegalAccessException  | NoSuchMethodException  | InvocationTargetException e) {  // ...  } try {  this.getClass().getMethod("method").invoke(this);  } catch (ReflectiveOperationException e) {  // ...  } ϦϑϨΫγϣϯ͸جఈྫ֎ΫϥεͷDBUDIͰΑ͛͞

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+43/*0 +BWBͰϑΝΠϧΛѻ͏ؾʹͳΕΔʢॏཁʣ

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/*0 List lines = new ArrayList();  BufferedReader br = new BufferedReader(  new InputStreamReader(  new FileInputStream(fileName), StandardCharsets.UTF_8));  for (String line; (line = br.readLine()) != null; ) {  lines.add(line);  } List lines = Files.readAllLines(path); 🌾DMPTFলུ

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+BWBϐοΫΞοϓ +BWB4& +43 1SPKFDU-BNCEB +43 %BUFBOE5JNF"1* +43

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+43 1SPKFDU-BNCEB -BNCEB&YQSFTTJPO .FUIPE3FGFSFODF 0QUJPOBM

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-BNCEB&YQSFTTJPO (String arg) -> { /* ͳΜ͔ॲཧ */ } arg -> /* ͳΜ͔ࣜ */ System.out::println .FUIPE3FGFSFODF

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0QUJPOBM MBNCEBͱͷซ༻͕جຊ JT1SFTFOU࢖͏ͱΠϚΠν OVMMΛࠜઈ΍͠ʹͯ͠΄͍͠ Optional java = Optional.of(“java");   java.ifPresent(System.out::println);

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+43 %BUFBOE5JNF"1* %BUF5JNF%BUF5JNF -PDBM;POFE %BUF5JNF'PSNBUUFS ͳͲʜʜ

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͋Θͤͯݟͯཉ͍͠

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͍·Ͳ͖ͷ+BWB؀ڥ ϥΠϒϥϦ΍ϑϨʔϜϫʔΫ *%& ϏϧυγεςϜ

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ϥΠϒϥϦ΍ ϑϨʔϜϫʔΫ ૬มΘΒͣͨ͘͞Μ͋Δ Ή͠Ζ૿͑ΔҰํ ੈ୅ަ୅΍ํ޲ੑͷมಈ͕ىͬͯͨ͜Γ +BWB&&΍4QSJOH#PPUͳͲͷྲྀΕ

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*%& &DMJQTFͷಠஃ৔͔Βબ୒΁ &DMJQTF /FU#FBOT *OUFMMJ+*%&"

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ϏϧυγεςϜ "OU.BWFO͔Β(SBEMF΁ʁ ҰؾʹมΘΔؾ഑͸ͳͦ͞͏ ঃʑʹมΘ͍ͬͯΔҹ৅͸͋Δ

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͜Ε·Ͱ͍·Ͳ͖ ݴޠ ݹष͞΍৑௕͞͸১ΘΕͭͭ͋Δ ؀ڥ ͜Ε·ͰΛϕʔεʹΑΓڧྗʹ

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࣌ʹ l͍·Ͳ͖ͷ+BWBz ࢖ͬͯ·͢ʁ

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͍·Ͳ͖ͷ+BWB ͳΜ͔ඍົͳײ͕͢͡ΔɻͳΜͰʁ ࢖͑Δਓ͕͍ͳ͍ʁ ಈ͔ͳ͍ʁ

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࢖͑Δਓ͕͍ͳ͍ʁ ࢖ͬͯͳ͍΋ͷΛ࢖͑ΔΑ͏ʹɺͳΜͯ  ͳΔΘ͚͕ͳ͍ɻ ࢖ͬͯͳ͍͔Β࢖Θͳ͍ͱ͔ݴͬͯΔͱ  ͍ͭ·Ͱ΋มΘΒͳ͍ɻ

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࢖͑Δਓ͕͍ͳ͍ʁ +BWB4& ͷ৘ใ͸े෼ग़ճͬͯΔ ͦͷลΛݟͯษڧ͍ͯ͠Δํʑ΋ډΔ ʮ࢖ͬͨ͜ͱͳ͍ਓ͕ଟ͍ʯͳΒɺ࢖͑͹͍ ͍͚ͩͷ࿩ ࢖ͬͨ͜ͱͷ͋Δਓ͸૿͑Δ͜ͱ͸͋ͬͯ ΋ݮΓ͸͠ͳ͍ͷ͔ͩΒ

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ಈ͔ͳ͍ʁ όʔδϣϯΞοϓͨ͠Βಈ͔ͳ͘ͳΔͱݴ͏ ࿩͕ͪΒ΄Βͱ

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+BWBͷޓ׵ੑ

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;ͭ͏ʹແཧͳ͜ͱ +%,Ͱ;ͭ͏ʹίϯύΠϧͨ͠ DMBTTϑΝΠϧΛ+3&͸ಡΊͳ͍ -BNCEB ஌ΒΜ͕ͳʜʜ ͱ͸͍͑ʜʜ +3&͞Μ

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ޙํޓ׵ੑ͸΄΅໰୊ແ͍ +4&࣌୅ͷίʔυ͸ ͍͍ͩͨ+%,ͰίϯύΠϧՄೳ +4&࣌୅ͷDMBTT΍KBS͸ ͍͍ͩͨ+3&Ͱ࣮ߦՄೳ

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ޙํޓ׵ੑ͸΄΅໰୊ແ͍ +4&࣌୅ͷίʔυ͸ ͍͍ͩͨ+%,ͰίϯύΠϧՄೳ +4&࣌୅ͷDMBTT΍KBS͸ ͍͍ͩͨ+3&Ͱ࣮ߦՄೳ

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ӡ͕ѱ͍ͱࣄނΔ ม਺໊ʹFOVNΛ࢖ͬͯͯίϯύΠϧΤϥʔ ΠϯλϑΣʔεʹϝιου͕૿͑ͯίϯύΠϧ Τϥʔ ࠶ίϯύΠϧͤͣಈ͔ͨ͠Β࣮ߦ࣌ྫ֎ ϦϑϨΫγϣϯͰऔΕΔॱ൪͕มΘͬͯ༧ظ ͠ͳ͍ྫ֎ ͱ͸ݴ͑͜Ε͸ӡ͕ѱ͍࿩

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+BWBࣗମ͸ͱ΋͔͘ ϥΠϒϥϦ͸ͭΒ͍

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ରԠ͍ͯ͠ͳ͍ϥΠϒϥϦ͕͋Δ

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ରԠ͍ͯ͠ͳ͍ϥΠϒϥϦ͕͋Δ ର৅ϥΠϒϥϦͷΞοϓσʔτ

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ରԠ͍ͯ͠ͳ͍ϥΠϒϥϦ͕͋Δ ର৅ϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ

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ରԠ͍ͯ͠ͳ͍ϥΠϒϥϦ͕͋Δ ର৅ϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ ґଘ͢ΔϥΠϒϥϦͷΞοϓσʔτ ͭΒ͍

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+BS)FMM ੲ͸KBSΛखಈͰ͔͖ूΊΔ͜ͱʹΑΔ࡞ۀ஍ ࠈΛҙຯ͍ͯͨ͠ Ϗϧυπʔϧ͕ґଘΛࣗಈͰղܾ͢Δ͜ͱͰ ऴΘ͔ͬͨʹࢥ͕͑ͨ ࠷ۙ͸KBSؒͷґଘ͕ಊʑ८Γ͢Δ͜ͱʹΑΔ ແؒ஍ࠈΛҙຯͯ͠ΔΑ͏ͳؾ͕͢Δ

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ϥΠϒϥϦͱޓ׵ੑ Ϋϥεͷ౷ഇ߹ɺجఈΫϥε΍ΠϯλϑΣʔ εͷมߋʹΑΓιʔεޓ׵͸͋ͬ͞ΓଛͳΘ Εͯ͠·͏ʢ͜ͱ΋͋Δʣ ϦϑϨΫγϣϯͷಈ࡞΍ɺΫϥεϑΥʔϚο τͳͲɺ௨ৗͷޓ׵ੑ΄ͲڧݻʹकΒΕ͍ͯ ͳ͍΋ͷʹґଘ͍ͯ͠Δʢ͜ͱ΋͋Δʣ ڧྗͳϥΠϒϥϦ΄Ͳ܏޲͸ڧ͍ʢؾ͕͢Δʣ

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ϥΠϒϥϦͱޓ׵ੑ +BWBͷڧΈͷ͸ͣͷʮϥΠϒϥϦͷॆ࣮ʯ ޓ׵ੑΛߟ͑ΔͱωοΫʹͳΔ όʔδϣϯΞοϓ࣌͸ಛʹݦஶ ৐Γӽ͑ͳ͍ͱz͍·Ͳ͖ͷ+BWBz͕࢖͑ͳ͍

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ͱ͸͍͑ ద੾ͳॱ൪Ͱόʔδϣϯ͍͚͋͛ͯ͹ɺҙ֎ ͱ͢ΜͳΓ্͛ΒΕͨΓ͢Δɻ ϝδϟʔόʔδϣϯΞοϓز͔ͭ΍͚ͬͨͲɺ ϋϚΔͷ͸ʮ·͍͔ͨͭ͜ʯͱ͍͏Ұ෦Ͱ͢ɻ

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ͳΜͱ͔ͳΔ

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ੜ͖ͨ+BWBΛ࢖͍ͬͯͨ͘Ίʹ΋ɺ͍·Ͳ͖ ͷ+BWBΛ஌ͬͯ࢖͍͖ͬͯ·͠ΐ͏ɻ

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͜Ε͔Βͷ+BWBͷ ͱ͔͔ͬΓ

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͜Ε͔Βͷ+BWB 1SPKFDU+JHTBX 1SPKFDU7BMIBMMB 1SPKFDU1BOBNB ࠷ॳʹݴͬͨ௨Γ ͜ͷลͷ࿩͸͠·ͤΜ

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͜Ε·Ͱˠ͜Ε͔Β Ұ൪ͷҧ͍͸ʮ+BWBࣗ਎͕੒௕͢Δʯ͜ͱ গ͠લʹ+BWB4&͕ग़ͯ ͦͷ೥ͪΐ͍ޙʹ+BWB4&͕ग़ͯ ͨͿΜ೥͘Β͍ޙʹ+BWB4&͕ग़Δ

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೥લ ೥લ

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J2SE 5.0 ೥લ ೥લ

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J2SE 5.0 Java SE 6 ೥લ ೥લ

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J2SE 5.0 Java SE 6 Java SE 7 ೥લ ೥લ

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J2SE 5.0 Java SE 6 Java SE 7 Java SE 8 ೥લ ೥લ

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J2SE 5.0 Java SE 6 Java SE 7 Java SE 8 ೥લ ೥લ ໿೥

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̑೥ͷϒϥϯΫ +BWB͔ΒΛݟૹͬͨΒܖػΛࣦͬͨ +BWBͰ࡞ͬͨΒػձ͕དྷͳ͔ͬͨ ্͛ΒΕͳ͍··ಈ͚ͳ͘ͳͬͯ͠·ͬͨ J2SE 5.0 Java SE 6 Java SE 7 Java SE 8 ໿೥

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ͱ͸ݴ͑͜Ε͔Β͸ߋ৽͞Ε͍ͯ͘ͷͰɺ  ண͍͍͖͍ͯͨͱ͜ΖͰ͸͋Δɻ

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ߋ৽ͯ͠Έͨ࿩ͦͷ ࣮ߦ؀ڥ͚ͩ+BWBʹͯ͠Έͨ ίʔυɺίϯύΠϥ͸+BWBͷ·· ϥΠϒϥϦ͸ߋ৽ͤͣ ͍͚ͨˠͳΜͷ໰୊΋ͳ͘ಈ͍͍ͯΔ

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ߋ৽ͯ͠Έͨ࿩ͦͷ ࣮ߦ؀ڥ͚ͩ+BWBʹͯ͠Έͨ ίʔυɺίϯύΠϥ͸+BWBͷ·· ϥΠϒϥϦ͸ߋ৽ͤͣ ͩΊͩͬͨˠ࣮ߦ؀ڥͷόʔδϣϯ֬ೝ͠ ͍ͯΔϥΠϒϥϦ͕͋ͬͨʜʜ

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ߋ৽ͯ͠Έͨ࿩ͦͷ ίϯύΠϥ͚ͩ+BWBʹͯ͠Έͨ UBSHFU ίʔυɺ࣮ߦ؀ڥ͸+BWBͷ·· ϥΠϒϥϦ͸ߋ৽ͤͣ ͍͚ͨˠͳΜͷ໰୊΋ͳ͘ಈ͍͍ͯΔ

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ߋ৽ͯ͠Έͨ࿩ͦͷ ίϯύΠϥ࣮ߦ؀ڥͱ΋ʹ+BWBʹͯ͠Έͨ ίʔυ͸+BWBͷ·· ϥΠϒϥϦ͸ߋ৽ͤͣ ͍͚ͨˠͳ͔ͥಈ͍ͯ͠·ͬͨ ͚ͲMBNCEBͭॻ͍ͨॠؒམͪͨ

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͜Ε͔Βͷͱ͔͔ͬΓ +BWB͸ੜ͖ͯͯɺݩؾʹಈ͖࢝Ίͨ ͦΜͳ+BWBʹৼΓམͱ͞Εͳ͍ͨΊʹ

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ݴޠͷͱ͔͔ͬΓ -BNCEBʹ͍ͭͯ͜ΕͯΔʁ (SPPWZ΍4DBMBͳΜ͔Λ΍ͬͯͨਓ͸ฏવ ͱѻͬͯΔ ࠓޙͷ+BWBʹ௥ਵ͢ΔͨΊʹผͷݴޠʹ΋৮ Ε͓ͯ͘ͱ͍͍͔΋

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؀ڥͷͱ͔͔ͬΓ Ϗϧυπʔϧ͸ΑΓਐԽ͍ͯ͘͠͸ͣ ΋ͬͱେ͖͘ͳ؀ڥΛϏϧυͦ͠͏ ͦͷ͏ͪ+BS)FMMΛղফͯ͘͠ΕΔ͔΋ ݱঢ়Ͱ΋ཧղ͓͚ͯ͠͹े෼ͳ෢ثʹͳΔ

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લʹਐΉͳΒ͹ ৽چͷ৘ใͷݟۃΊ͸೉͘͠ͳ͍ͬͯ͘ ෆ҆ͳϥΠϒϥϦͷ૊Έ߹Θͤ΋ ΞμϓλΛ࣮૷͢Δඞཁ΋͋Δ͔΋ ಈ͔ͯ͠ݕূ͢Δࣗಈςετ͸·͢·͢ॏཁ ʹͳͬͯ͘Δͱࢥ͏

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ཹ·Δ༐ؾ ແཧͤͣཹ·Δબ୒ࢶ΋ߟྀʹೖΕΔ ݹ͍ίʔυɺݹ͍ίϯύΠϥɺ৽͍࣮͠ߦ ؀ڥͱ͔Ͱ΋͍͍ͩͨେৎ෉ ҆શࡦΛͱΔͳΒ࣮ߦ؀ڥ΋αϙʔτड͚Ε ʢۚͰͿΜԥΕ͹ͳΜͱ͔ͳΔʣ &OEPG1VCMJD6QEBUFT&0-

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प೥Λܴ͑ɺ+BWB͸·͢·͢ݩؾ ͜Ε͔Β΋+BWBͱڞʹߦͨ͘Ίʹ  ͓ޓ͍ʹ৘ใग़͠߹͍͖ͬͯ·ͤΜ͔ʁ ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠