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4USFBN"1*ೖ໳ ʙ͍·͞Βฉ͚ͳ͍4USFBNͷΩϗϯ "DSPRVFTU5FDIOPMPHZגࣜձࣾ
 ೔ຊ+BWBϢʔβʔάϧʔϓ ୩ຊ৺ !DFSP@U

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ͳͥɺ4USFBN"1*Λ
 ֶͿ΂͖ͳͷ͔ʁ

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৽͍͔͠Βʁ ੑೳ͕͍͍͔Βʁ ؆ܿʹॻ͚Δ͔Βʁ

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4USFBN"1*ͷΑ͏ͳ
 ෺ࣄͷଊ͑ํ͕ࠓޙ਺೥ͷ
 ίʔσΟϯάʹඞཁͱ
 ͳͬͯ͘Δ͔Β

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ৄ͍͠࿩͸ޙͰ΍Γ·͢

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·ͣ͸ʮ؆ܿʹॻ͚Δ͔Βʯ
 ͩͱଊ͑ͯ࢝Ί·͠ΐ͏

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5BCMFPG$POUFOUT w 4USFBN"1*ͱ͸ʁ w -BNCEBࣜͱ͸ʁ w 4USFBN"1*ͷॻ͖ํͱɺԡ͑͞ΔϙΠϯτ w ͳͥ4USFBN"1*͕ॏཁͳͷ͔

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4USFBN"1*ͱ͸ʁ

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4USFBNྲྀΕ

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No content

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ৄ͍͠࿩͸ޙͰ΍Γ·͢

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େྔσʔλΛஞ࣍ॲཧ͢Δ
 ʮετϦʔϜॲཧʯΛ
 ؆ܿʹॻͨ͘Ίͷ"1*

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͚ͩͲɺ
 ίϨΫγϣϯͷૢ࡞Λ
 ؆ܿʹॻ͘͜ͱ΋Ͱ͖Δ

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List students = new ArrayList<>(); students.add(new Student("Ken", 100)); students.add(new Student("Shin", 60)); students.add(new Student("Takuya", 80)); for (Student student : students) { if (student.getScore() >= 70) { System.out.println(student); } } ͜Ε͕

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List students = new ArrayList<>(); students.add(new Student("Ken", 100)); students.add(new Student("Shin", 60)); students.add(new Student("Takuya", 80)); 
 students.stream() .filter(s -> s.getScore() >= 70) .forEach(System.out::println); ͜͏ͳΔ

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ίϨΫγϣϯͷ
 ߜΓࠐΈɺม׵΍ɺ
 ͦΕͧΕͷཁૉ΁ͷॲཧɺ
 ूܭͳͲ͕Ͱ͖Δ

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ͱ͸ݴ͑

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Map groupByDeptAndFilter(List list) { return list.stream() .collect(Collectors.groupingBy(emp -> emp.dept)) .entrySet() .stream() .collect(Collectors.toMap(entry -> entry.getKey(), entry -> entry.getValue() .stream() .filter(emp -> emp.sal > 1000) .count())); }

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Կ͜ΕಡΊͳ͍

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GPSจΛ࢖ͬͯ
 ॻ͖௚͢ͱ

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Map groupByDeptClassic(List list) { Map result = new HashMap<>(); for (Emp emp : list) { if (result.containsKey(emp.dept) == false) { result.put(emp.dept, 0L); } if (emp.sal > 1000) { Long count = result.get(emp.dept); count++; result.put(emp.dept, count); } } return result; }

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ಡΈ΍͍͢ʂ
 ✌ Т✌ ࡾ✌ Т ✌ࡾ ✌Т ✌

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Έ͍ͨͳ͜ͱʹͳΔͷͰ
 ແཧͯ͠ෳࡶͳ΋ͷΛ
 4USFBN"1*Ͱ
 ॻ͘ඞཁ͸ͳ͍Ͱ͢

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৽͍͠΋ͷΛ࢖͏͜ͱ͕
 ৗʹΤϥ͍Θ͚͡Όͳ͍

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ผʹੑೳ΋มΘΜͳ͍

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·ͣ͸جຊతͳॻ͖ํͱ
 ͦͷ֓೦Λֶͼ·͠ΐ͏

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-BNCEBࣜͱ͸ʁ

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˓ϥϜμࣜ
 ºϥϯόμࣜ

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List students = new ArrayList<>(); students.add(new Student("Ken", 100)); students.add(new Student("Shin", 60)); students.add(new Student("Takuya", 80)); 
 students.stream() .filter(s -> s.getScore() >= 70) .forEach(System.out::println); ͜ͷ෦෼

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4USFBN"1*Λ
 ؆ܿʹॻͨ͘Ίʹ
 ͔ܽͤͳ͍΋ͷ

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-BNCEBࣜͱ͸
 ࣮૷͢΂͖ϝιου͕
 ͔ͭ͠ͳ͍ΠϯλϑΣʔεΛ
 ؆ܿʹදهͰ͖Δ΋ͷ

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ͨͱ͑͹ KBWBVUJM$PNQBSBUPS
 
 ࣮૷͢Δ΂͖ϝιου͸
 DPNQBSF

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void sort() { List studentList = new ArrayList<>(); studentList.add(new Student("Murata", 100)); studentList.add(new Student("Okada", 70)); studentList.add(new Student("Tanimoto", 80)); System.out.println(studentList); Collections.sort(studentList, new StudentComparator()); System.out.println(studentList); } class StudentComparator implements Comparator { @Override public int compare(Student student1, Student student2) { return Integer.compare(student1.getScore(), student2.getScore()); } } ͜ͷ෦෼

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void sortAnonymous() { List studentList = new ArrayList<>(); studentList.add(new Student("Murata", 100)); studentList.add(new Student("Okada", 70)); studentList.add(new Student("Tanimoto", 80)); System.out.println(studentList); Collections.sort(studentList, new Comparator() { @Override public int compare(Student student1, Student student2) { return Integer.compare(student1.getScore(), student2.getScore()); } }); System.out.println(studentList); } ແ໊ΫϥεΛ࢖͏ͱ

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void sortLambda() { List studentList = new ArrayList<>(); studentList.add(new Student("Murata", 100)); studentList.add(new Student("Okada", 70)); studentList.add(new Student("Tanimoto", 80)); System.out.println(studentList); Collections.sort(studentList, (student1, student2) -> Integer.compare(student1.getScore(), student2.getScore())); System.out.println(studentList); } -BNCEBΛ࢖͏ͱ

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࣮૷͢΂͖ϝιου͕
 ͔ͭ͠ͳ͍ΠϯλϑΣʔεΛ
 ʮؔ਺ܕΠϯλϑΣʔεʯ
 ͬͯݺͼ·͢

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4USFBN"1*ͷҾ਺͸
 جຊతʹ͢΂ͯ
 ؔ਺ܕΠϯλϑΣʔε

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4USFBN"1*Λ͢΂ͯ
 ແ໊ΫϥεͰ࡞Δͱ
 ಡΈͮΒͯ͘࢓ํͳ͍ͷͰ
 ؔ਺ͬΆ͘ॻ͚Δ
 -BNCEB͕ࣜಋೖ͞Εͨ

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List students = new ArrayList<>(); students.add(new Student("Ken", 100)); students.add(new Student("Shin", 60)); students.add(new Student("Takuya", 80)); 
 students.stream() .filter(s -> s.getScore() >= 70) .forEach(System.out::println); ΋͜͠Ε͕

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List students = new ArrayList<>(); students.add(new Student("Ken", 100)); students.add(new Student("Shin", 60)); students.add(new Student("Takuya", 80)); students.stream() .filter(new Predicate() { @Override public boolean test(Student student) { return student.getScore() >= 70; } }) .forEach(new Consumer() { @Override public void accept(Student student) { System.out.println(student); } }); ͜͏ͳΒ

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୭΋͓લΛѪ͞ͳ͍

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-BNCEBࣜͷจ๏

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-BNCEBࣜͷجຊจ๏
 
 Ҿ਺ \ॲཧ^

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(Student student1, Student student2) -> { int score1 = student1.getScore(); int score2 = student2.getScore(); return Integer.compare(score1, score2); } (Student student) -> {
 System.out.println(student); } () -> {
 System.out.println("Hello!"); }

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Ҿ਺ͷܕ͸লུͰ͖Δ

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(Student student1, Student student2) -> { int score1 = student1.getScore(); int score2 = student2.getScore(); return Integer.compare(score1, score2); } (student1, student2) -> { int score1 = student1.getScore(); int score2 = student2.getScore(); return Integer.compare(score1, score2); }

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ॲཧ͕ߦͳΒ SFUVSOͱ\^͕
 লུͰ͖Δ

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(student1, student2) -> { int score1 = student1.getScore(); int score2 = student2.getScore(); return Integer.compare(score1, score2); } 
 
 (student1, student2) -> { return Integer.compare(student1.getScore(), student2.getScore()); } (student1, student2) -> Integer.compare(student1.getScore(), student2.getScore())

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Ҿ਺͕ͭͳΒ
 ΋লུͰ͖Δ

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(Student student) -> {
 System.out.println(student); } 
 
 
 student -> System.out.println(student)

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-BNCEBͷத਎͕
 ϝιουݺͼग़ͭ͠Ͱ
 Ҿ਺΋໌֬ͳΒ
 ϝιουࢀর͕࢖͑Δ

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ϝιουࢀরͷจ๏ Ϋϥε໊ϝιου໊

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(Student student) -> {
 System.out.println(student); } 
 
 
 student -> System.out.println(student) System.out::println

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(Student student) -> {
 return student.getScore(); } 
 
 
 student -> student.getScore(); Student::getScore

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List students = new ArrayList<>(); students.add(new Student("Ken", 100)); students.add(new Student("Shin", 60)); students.add(new Student("Takuya", 80)); 
 students.stream() .filter(s -> s.getScore() >= 70) .forEach(System.out::println); ݁Ռɺ͜͏ͳΔ

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͜͜·Ͱ͸0,ʁ

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4USFBN"1*ͷॻ͖ํͱ
 ԡ͑͞ΔϙΠϯτ

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࡞Δ ૢ࡞͢Δ ·ͱΊΔ

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Α͘࢖͏ύλʔϯ
 TUSFBN Ͱ࡞Γ NBQ ͰՃ޻͠
 pMUFS ͰߜΓࠐΈ
 DPMMFDU Ͱཉ͍͠ܗʹ͢Δ

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࡞Δ

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4USFBNΛฦ͢"1*Λ
 ݺͼग़͢͜ͱͰ
 4USFBNΛ࡞Δ

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List lines = Arrays.asList("Murata=100", "Okada=60", "Tanimoto=80"); List students = lines.stream() .map(s -> { String[] strings = s.split("="); return new Student(strings[0], Integer.valueOf(strings[1])); }) .filter(s -> s.getScore() >= 70) .collect(Collectors.toList()); $PMMFDUJPOTUSFBN

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String[] lines = {"Murata=100", "Okada=60", "Tanimoto=80"}; List students = Arrays.stream(lines) .map(s -> { String[] strings = s.split("="); return new Student(strings[0], Integer.valueOf(strings[1])); }) .filter(s -> s.getScore() >= 70) .collect(Collectors.toList()); "SSBZTTUSFBN

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.BQͳΒ FOUSZ4FU TUSFBN ϑΝΠϧΛߦͣͭಡΉͳΒ 'JMFTMJOFT #VGGFSFE3FBEFSMJOFT

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ૢ࡞͢Δ
 ʢதؒૢ࡞ʣ

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ઈରʹ֮͑ͯཉ͍͠ NBQͱpMUFS

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ม׵΍ߜΓࠐΈͳͲͷ
 ૢ࡞Λߦ͏ͷ͕தؒૢ࡞

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NBQ
 ཁૉΛผͷཁૉʹม׵͢Δ pMUFS ৚݅Λࢦఆͯ͠ߜΓࠐΉ

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List lines = Arrays.asList("Murata=100", "Okada=60", "Tanimoto=80"); List students = lines.stream() .map(s -> { String[] strings = s.split("="); return new Student(strings[0], Integer.valueOf(strings[1])); }) .filter(s -> s.getScore() >= 70) .collect(Collectors.toList()); } NBQͱpMUFS

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List lines = Arrays.asList("Murata=100", "Okada=60", "Tanimoto=80"); List students = lines.stream() .map(s -> { String[] strings = s.split("="); return new Student(strings[0], Integer.valueOf(strings[1])); })
 // この時点でStudentのstreamになる .filter(s -> s.getScore() >= 70) // この時点でMurataとTanimotoが残ったstreamになる .collect(Collectors.toList()); } NBQͱpMUFS

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MJNJUͰ݅਺ΛߜΔ EJTUJODUͰϢχʔΫʹߜΔ
 TPSUFEͰฒ΂ม͑Δ
 ͳͲͳͲ

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Α͋͘Δޡղࠞཚ

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NBQͳͲͷม׵ॲཧͰ͸
 ཁૉͷ਺͸มΘΒͳ͍

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ཁૉΛ͍͔ͭ͘·ͱΊͯ
 ॲཧ͢Δ
 Έ͍ͨͳ͜ͱ͸Ͱ͖ͳ͍
 ʢྫɿෳ਺ߦͷϩάϑΝΠϧॲཧʣ

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͋͘·Ͱɺ݅݅ɺ
 Կ͔͢Δ͍ͬͯ͏΋ͷ

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pMUFSͰ෼ذ͢Δ͜ͱ͸
 Ͱ͖ͳ͍

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͜ͷ৚݅ͷ4USFBNɺ
 ͦͷ৚݅ͷ4USFBNɺ
 ͋ͷ৚݅ͷ4USFBNɺ
 ͲΕʹ΋֘౰͠ͳ͍4USFBN
 Έ͍ͨͳ͜ͱ͸Ͱ͖ͳ͍

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͋͘·Ͱ΋
 4USFBN͸ຊ

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qBU.BQΛ࢖͑͹ ͭͷཁૉ͔Β
 ෳ਺ͷཁૉΛ
 ࡞Δ͜ͱ͸Ͱ͖Δ

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͔Β ͸࡞ΕΔ

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Ͱ΋આ໌͸ׂѪ͢ΔΑʂ

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·ͱΊΔ
 ʢऴ୺ૢ࡞ʣ

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4USFBNΛ
 -JTUʹͨ͠Γ.BQʹͨ͠Γ ߹ܭ஋΍ฏۉ஋Λܭࢉͨ͠Γ

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࠷ޙʹ݁Ռͱͯ͠
 औΓग़͢΋ͷ͕
 ऴ୺ૢ࡞

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Ұ൪࢖͏ͷ͕
 DPMMFDUͱ$PMMFDUPSTͷ
 ૊Έ߹Θͤ

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List lines = Arrays.asList("Murata=100", "Okada=60", "Tanimoto=80"); List students = lines.stream() .map(s -> { String[] strings = s.split("="); return new Student(strings[0], Integer.valueOf(strings[1])); }) .filter(s -> s.getScore() >= 70) .collect(Collectors.toList()); } DPMMFDU

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$PMMFDUPSTUP4FU
 $PMMFDUPSTUP.BQ Ͱ4FU΍.BQʹม׵

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String[] lines = {"Murata=100", "Okada=60", "Tanimoto=80"}; Map students = Arrays.stream(lines) .map(s -> { String[] strings = s.split("="); return new Student(strings[0], Integer.valueOf(strings[1])); }) .collect(Collectors.toMap(s -> s.getName(), s -> s)); return students; $PMMFDUPSTUP.BQ

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$PMMFDUPSTKPJOJOHͰ
 શ෦ͭͳ͛ͨจࣈྻʹม׵

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$PMMFDUPSTHSPVQJOH#Z Ͱ
 -JTUͷ.BQΛ࡞Δ

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DPMMFDUҎ֎ͷऴ୺ૢ࡞

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GPS&BDI
 ೚ҙͷॲཧΛ͢Δ
 ʢ໭Γ஋ͳ͠ʣ

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NBY NJO
 ࠷େͷ݅ɺ࠷খͷ݅ΛऔΔ pOE'JSTU
 ࠷ॳͷ݅ΛऔΔ

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਺஋ͷ4USFBNͳΒ
 BWFSBHFͱ͔΋औΕΔ

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ཁ͢Δʹ
 4USFBNΛ
 ԿΒ͔ͷܗͰ
 ू໿ͯ͠औΓग़͢΋ͷ

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ऴ୺ૢ࡞͸
 Ұճ͔͠Ͱ͖ͳ͍

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UP-JTUͱGPS&BDIͷ
 ྆ํΛ͢Δ͜ͱ͸Ͱ͖ͳ͍

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ͱ͍͏ลΓΛ౿·͑ͯ
 GSPNPME+BWB
 UPNPEFSO+BWB

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List list = new ArrayList<>(); try (BufferedReader reader = Files.newBufferedReader(Paths.get(fileName))) { String line; while ((line = reader.readLine()) != null) { String[] s = line.split(","); Transaction tx = new Transaction(); tx.date = LocalDate.parse(s[0]); tx.accountId = s[1]; tx.amount = Integer.valueOf(s[2]); tx.name = s[3]; tx.note = s[4]; list.add(tx); } } catch (IOException e) { throw new RuntimeException("failed to parse date or read file", e); } return list; GSPN

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try (Stream stream = Files.lines(Paths.get(fileName))) { return stream .map(line -> { String[] s = line.split(","); Transaction tx = new Transaction(); tx.date = LocalDate.parse(s[0]); tx.accountId = s[1]; tx.amount = Integer.valueOf(s[2]); tx.name = s[3]; tx.note = s[4]; return tx; }) .collect(Collectors.toList()); } catch (IOException e) { throw new UncheckedIOException("failed to read file", e); } UP4USFBN

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try (Stream stream = Files.lines(Paths.get(fileName))) { return stream .map(line -> { String[] s = line.split(","); Transaction tx = new Transaction(); tx.date = LocalDate.parse(s[0]); tx.accountId = s[1]; tx.amount = Integer.valueOf(s[2]); tx.name = s[3]; tx.note = s[4]; return tx; }) .collect(Collectors.toList()); } catch (IOException e) { throw new UncheckedIOException("failed to read file", e); } UP4USFBN ϑΝΠϧΛಡΈࠐΜͰ
 Streamͱͯ͠ฦ͢ϝιου
 ʢߦ͝ͱʹॲཧʣ ߦͷStringΛ
 Transactionʹม׵ Listʹͯ͠ฦ͢

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// 取引履歴の取得 List list = read(fileName); // 全件表示 for (Transaction tx : list) { System.out.println(tx); } // 残高の計算 int sum = 0; for (Transaction tx : list) { sum += tx.amount; } System.out.println(sum); // 6月分のみ表示 for (Transaction tx : list) { if (tx.date.getMonth() == Month.JUNE) { System.out.println(tx); } } GSPN

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// 取引履歴の取得 read(fileName).stream() .forEach(System.out::println); // 残高の計算 int sum = read(fileName).stream() .mapToInt(tx -> tx.amount) .sum(); System.out.println(sum); // 6月分のみ表示 read(fileName).stream() .filter(tx -> tx.date.getMonth() == Month.JUNE) .forEach(System.out::println); UP4USFBN

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// 取引履歴の取得 read(fileName).stream() .forEach(System.out::println); // 残高の計算 int sum = read(fileName).stream() .mapToInt(tx -> tx.amount) .sum(); System.out.println(sum); // 6月分のみ表示 read(fileName).stream() .filter(tx -> tx.date.getMonth() == Month.JUNE) .forEach(System.out::println); UP4USFBN ͢΂ͯͷཁૉʹ͍ͭͯ
 ॱ൪ʹॲཧ औҾֹΛint஋ͱͯ͠औΓग़ͯ͠
 intͷstreamʢIntStreamʣʹ͔ͯ͠Β
 ߹ܭ஋Λऔಘ 6݄ͷΈΛऔΓग़ͯ͠
 શ݅දࣔ

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΋͏গ͠ࠐΈೖͬͨ಺༰͸
 ϥΠϒίʔσΟϯάͰ

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ͳͥ4USFBN"1*͕
 ॏཁͳͷ͔ʁ

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$PMMFDUJPOΛ؆ܿʹ
 ѻ͑ΔΑ͏ʹͳΔมΘΓʹ
 ݁ߏɺ֮͑Δ͜ͱ͕ଟ͍

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େͯ͠༥௨΋ར͔ͳ͍

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͡Ό͊ͳΜͰ4USFBNΛ
 ࢖͏ͷ͔ʁ

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4USFBN"1*ͷ
 େ͖ͳ໨త͸
 4USFBNΛѻ͏͜ͱ

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No content

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$PMMFDUJPO͸
 طʹ಺༰͕ܾ·͍ͬͯΔ
 σʔλ ʢ$PME4USFBNʣ

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ຊདྷͷ4USFBN͸
 ઈ͑ͣͯ͠
 ͔͠΋΋ͱͷਫʹ͋Βͣ

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8FCͷϦΫΤετ΍
 ΩϡʔΠϯάॲཧͳͲ ಺༰΍্ݶ͕
 ܾ·ͬͯͳ͍΋ͷ
 ʢ)PU4USFBNʣ

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+BWBͷ4USFBN"1*͸
 جຊతʹ$PME4USFBNΛ
 ѻ͏ͨΊͷ΋ͷ

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ओઓ৔͸)PU4USFBN

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)PU4USFBNʹ
 ඞཁͳ΋ͷ

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΢Οϯυ΢ؔ਺

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ྫɿ ਺ສͷηϯαʔ͔Β
 ૹ৴͞Εͨ৘ใΛ
 ड৴͠ͳ͕Β
 ूܭॲཧΛ͢Δ

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ड৴ॲཧͱฒߦͯ͠ɺ
 ਺݅ͣͭ·ͱΊͯूܭ͢Δɺ
 ਺ඵͣͭूܭ͢Δɺ
 ໰୊͕͋Ε͹Ξϥʔτ

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ͦΜͳ͜ͱ͕Ͱ͖Δ
 ΢Οϯυ΢ؔ਺͕ඞཁ

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+BWBͰଟগ͸ೖΔ͕
 ࠓͷͱ͜Ζ͸
 3Y+BWB΍3FBDUPSΛ࢖͏

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void monitorGauge(Flux input) { input.bufferTimeout(100, Duration.ofSeconds(10)) .subscribe(list -> { DoubleSummaryStatistics stats = list.stream() .mapToDouble(Double::doubleValue) .summaryStatistics(); if (stats.getMax() > maxThreshold) { alert(Level.WARNING); } if (stats.getAverage() > averageThreshold) { alert(Level.SEVERE); } }); } 3FBDUPSͷ"1*

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void monitorGauge(Flux input) { input.bufferTimeout(100, Duration.ofSeconds(10)) .subscribe(list -> { DoubleSummaryStatistics stats = list.stream() .mapToDouble(Double::doubleValue) .summaryStatistics(); if (stats.getMax() > maxThreshold) { alert(Level.WARNING); } if (stats.getAverage() > averageThreshold) { alert(Level.SEVERE); } }); } 3FBDUPSͷ"1* 100݅΋͘͠͸10ඵؒͷσʔλΛ
 ·ͱΊͯॲཧ͢Δ ʢूܭͯ͠ᮢ஋Λ௒͑ͨΒΞϥʔτʣ

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ϊϯϒϩοΩϯά"1*

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ྫɿ
 σʔλετΞ͔Β
 ສ݅ͷϨίʔυΛ
 औಘͨ͋͠ͱ
 ͦͷৄࡉσʔλΛ݅ͣͭ
 ສճऔಘ͢Δ

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֓ཁσʔλΛऔಘ͔ͯ͠Β
 ৄࡉσʔλΛऔಘ͢Δ

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͜Ε·Ͱ͸ಉظॲཧͰ
 σʔλϕʔεʹΞΫηε͢Δ
 Α͏ͳγεςϜΛͣͬͱ
 ࡞͖ͬͯ·ͨ͠

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42-Λສճ
 ൃߦ͢Δඞཁ͕͋Ε͹
 ॱ൪ʹສճൃߦͯ͠
 ੑೳ໰୊͕ى͖͍ͯ·ͨ͠

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WebΞϓϦ DB 1ສճͷSQLͰ
 ੑೳ໰୊͕ൃੜ

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WebΞϓϦ DB ͪΐͬͱ޻෉ͯ͠
 গ͠ॏ͍ͨΫΤϦͰΧόʔ

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ϚΠΫϩαʔϏε ϚΠΫϩαʔϏε 1ສճͷαʔϏεݺͼग़͠

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ϚΠΫϩαʔϏε ϚΠΫϩαʔϏε ͜ͷ1ສճͷαʔϏεݺͼग़͠Λ
 ʮͰ͖Δ͚ͩಉ࣌ʹʯ
 ࣮ߦ͍ͨ͠

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ϊϯϒϩοΩϯάͳ
 ඇಉظ"1*ͱͯ͠
 ΍͸Γ
 3Y+BWBɺ3FBDUPSΛ࢖͏

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Mono>> map =
 studentService.fetchStudents("1年3組") .flatMap(student -> scoreService.fetchScore(2017, student.id)
 .collectList() .map(scores -> Tuples.of(student, scores))) .collectMap(Tuple2::getT1, Tuple2::getT2); // 出力 System.out.println(map.block());
 
 
 // 呼び出すAPI Flux fetchStudents(String className); Flux fetchScore(int year, int id) 3FBDUPSͷ"1*

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Mono>> map =
 studentService.fetchStudents("1年3組") .flatMap(student -> scoreService.fetchScore(2017, student.id)
 .collectList() .map(scores -> Tuples.of(student, scores))) .collectMap(Tuple2::getT1, Tuple2::getT2); // 出力 System.out.println(map.block());
 
 
 // 呼び出すAPI Flux fetchStudents(String className); Flux fetchScore(int year, int id) 3FBDUPSͷ"1* ʢৄࡉ͸ׂѪ͢Δ͚Ͳʣ
 APIݺͼग़͠ΛϊϯϒϩοΩϯά͔ͭ
 ඇಉظʹݺͼग़͢͜ͱͰ
 ॲཧશମͷ࣌ؒΛ୹ॖ
 ͔͠΋ར༻εϨου਺͕গͳ͍

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͜͏͍͏΋ͷ͸ɺ͢΂ͯ
 4USFBN"1*ͷΑ͏ͳ
 ܗͰهड़͞ΕΔ͜ͱʹͳΔ

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ॲཧͷฒྻ౓Λ͋͛ͯ
 େྔσʔλ΍
 େྔϦΫΤετΛ
 ࡹ͘Α͏ͳ࣌୅

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ͦ͜ʹ޲͚ͨ४උͱͯ͠
 4USFBN"1*Λ
 शಘ͍ͯͩ͘͠͞

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-FU`T4UVEZ
 4USFBN"1*

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Ξϯέʔτޚڠྗ͓ئ͍͠·͢
 IUUQCJUMZKKVH

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+BWBຊ֨ೖ໳Λ
 ങͬͯͩ͘͞Δํ͸
 ͥͻ࿩͔͚͍ͯͩ͘͠͞