\u3053\u306e\u8a18\u4e8b\u3067\u306f\u30e2\u30ca\u30c9\u306b\u3064\u3044\u3066\u89e6\u308c\u3089\u308c\u3066\u307e\u3059\u304c\u79c1\u306f\u30e2\u30ca\u30c9\u3055\u3063\u3071\u308a\u89e3\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u305d\u308c\u3063\u3066\u6700\u4e2d\u306e\u89aa\u621a\u3067\u7518\u304f\u3066\u7f8e\u5473\u3057\u3044\u306e\uff1f\u3063\u3066\u30ec\u30d9\u30eb\u3067\u3059\u3002(^_^;)<\/p>\n
\u305d\u308c\u3067\u306f\u307e\u308b\u3063\u3068\u30b3\u30fc\u30c9\u3092\u7f8e\u5473\u3057\u304f\u3044\u305f\u3060\u3044\u3066\u52d5\u304f\u304b\u3069\u3046\u304b\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u30b3\u30fc\u30c9\u306f\u3044\u3064\u3082\u306e\u30c7\u30fc\u30bf\u3092\u5229\u7528\u3057\u307e\u3059\u3002<\/p>\n
\u7121\u99c4\u306b\u9577\u3044\u3067\u3059\u3002<\/p>\n
<\u2013 Person \u2013>
\u67f4\u7530 \u606d\u5e73, 61\u6b73, Gender: MALE \u4f53\u91cd : 70 \u8a55\u4fa1 : 8
\u58c7 \u871c, 32\u6b73, Gender: FEMALE \u4f53\u91cd : 60 \u8a55\u4fa1 : 6
\u5317\u5ddd \u666f\u5b50, 26\u6b73, Gender: FEMALE \u4f53\u91cd : 55 \u8a55\u4fa1 : 7
\u7dbe\u702c \u306f\u308b\u304b, 28\u6b73, Gender: FEMALE \u4f53\u91cd : 50 \u8a55\u4fa1 : 4
\u4f50\u3005\u6728 \u5e0c, 25\u6b73, Gender: FEMALE \u4f53\u91cd : 48 \u8a55\u4fa1 : 9
\u525b\u529b \u5f69\u82bd, 20\u6b73, Gender: FEMALE \u4f53\u91cd : 45 \u8a55\u4fa1 : 6
\u5c0f\u6817 \u65ec, 30\u6b73, Gender: MALE \u4f53\u91cd : 65 \u8a55\u4fa1 : 3
\u5800\u5317 \u771f\u5e0c, 24\u6b73, Gender: FEMALE \u4f53\u91cd : 45 \u8a55\u4fa1 : 10
\u6b66\u4e95 \u54b2, 19\u6b73, Gender: FEMALE \u4f53\u91cd : 50 \u8a55\u4fa1 : 5
\u5e02\u539f \u96bc\u4eba, 26\u6b73, Gender: MALE \u4f53\u91cd : 67 \u8a55\u4fa1 : 2
\u6df1\u7530 \u606d\u5b50, 30\u6b73, Gender: FEMALE \u4f53\u91cd : 50 \u8a55\u4fa1 : 8 <\/p>\n
\u4e0a\u8a18\u306e\u30ea\u30b9\u30c8\u3067\u4e00\u756a\u82e5\u3044\u7537\u6027\u306e\u3082\u3068\u3078\u4e00\u756a\u82e5\u3044\u5973\u6027\u304c\u304a\u5ac1\u5165\u308a\u3059\u308b\u3068\u3057\u3066\u305d\u306e\u5973\u6027\u306e\u65b0\u3057\u3044\u59d3\u540d\u3092\u8868\u793a\u3055\u305b\u3066\u307f\u307e\u3059\u3002 <\/p>\n
\u307b\u3052\u307b\u3052\uff20\u3061\u3087\u3081\u3061\u3087\u3081\u3000\u3063\u3066\u306d\u3002<\/p>\n
\r\npackage jp.yucchi.tryoptional;\r\n\r\nimport java.time.LocalDate;\r\nimport java.time.Period;\r\n\r\npublic class Person {\r\n\r\n public enum Sex {\r\n\r\n MALE, FEMALE\r\n }\r\n String firstName;\r\n String lastName;\r\n LocalDate birthday;\r\n Sex gender;\r\n int weight;\r\n int evaluation;\r\n\r\n public Person(String firstName, String lastName, LocalDate birthday, Sex gender, int weight, int evaluation) {\r\n this.firstName = firstName;\r\n this.lastName = lastName;\r\n this.birthday = birthday;\r\n this.gender = gender;\r\n this.weight = weight;\r\n this.evaluation = evaluation;\r\n }\r\n\r\n public String getFirstName() {\r\n return firstName;\r\n }\r\n\r\n public String getLastName() {\r\n return lastName;\r\n }\r\n\r\n public Sex getGender() {\r\n return gender;\r\n }\r\n\r\n public int getAge() {\r\n return Period.between(birthday, LocalDate.now()).getYears();\r\n }\r\n\r\n void printPerson() {\r\n System.out.println(firstName + \" \" + lastName + \", \" + this.getAge() + \"\u6b73\" + \", Gender: \"\r\n + this.getGender() + \" \u4f53\u91cd : \" + this.getWeight() + \" \u8a55\u4fa1 : \" + this.getEvaluation());\r\n }\r\n\r\n public int getWeight() {\r\n return weight;\r\n }\r\n\r\n public void setWeight(int weight) {\r\n this.weight = weight;\r\n }\r\n\r\n public int getEvaluation() {\r\n return evaluation;\r\n }\r\n\r\n public void setEvaluation(int evaluation) {\r\n this.evaluation = evaluation;\r\n }\r\n\r\n}\r\n\r\n<\/pre>\n\r\npackage jp.yucchi.tryoptional;\r\n\r\nimport java.time.LocalDate;\r\nimport java.util.ArrayList;\r\nimport static java.util.Comparator.comparing;\r\nimport java.util.List;\r\nimport java.util.Optional;\r\nimport java.util.function.ToIntFunction;\r\n\r\npublic class TryOptional {\r\n\r\n public static void main(String[] args) {\r\n\r\n List person = new ArrayList<>();\r\n\r\n person.add(new Person(\"\u67f4\u7530\", \"\u606d\u5e73\", LocalDate.of(1951, 8, 18), Person.Sex.MALE, 70, 8));\r\n person.add(new Person(\"\u58c7\", \"\u871c\", LocalDate.of(1980, 12, 3), Person.Sex.FEMALE, 60, 6));\r\n person.add(new Person(\"\u5317\u5ddd\", \"\u666f\u5b50\", LocalDate.of(1986, 8, 22), Person.Sex.FEMALE, 55, 7));\r\n person.add(new Person(\"\u7dbe\u702c\", \"\u306f\u308b\u304b\", LocalDate.of(1985, 3, 24), Person.Sex.FEMALE, 50, 4));\r\n person.add(new Person(\"\u4f50\u3005\u6728\", \"\u5e0c\", LocalDate.of(1988, 2, 8), Person.Sex.FEMALE, 48, 9));\r\n person.add(new Person(\"\u525b\u529b\", \"\u5f69\u82bd\", LocalDate.of(1992, 8, 27), Person.Sex.FEMALE, 45, 6));\r\n person.add(new Person(\"\u5c0f\u6817\", \"\u65ec\", LocalDate.of(1982, 12, 26), Person.Sex.MALE, 65, 3));\r\n person.add(new Person(\"\u5800\u5317\", \"\u771f\u5e0c\", LocalDate.of(1988, 10, 6), Person.Sex.FEMALE, 45, 10));\r\n person.add(new Person(\"\u6b66\u4e95\", \"\u54b2\", LocalDate.of(1993, 12, 25), Person.Sex.FEMALE, 50, 5));\r\n person.add(new Person(\"\u5e02\u539f\", \"\u96bc\u4eba\", LocalDate.of(1987, 2, 6), Person.Sex.MALE, 67, 2));\r\n person.add(new Person(\"\u6df1\u7530\", \"\u606d\u5b50\", LocalDate.of(1982, 11, 2), Person.Sex.FEMALE, 50, 8));\r\n \r\n Optional byYoungestMan_firstName;\r\n Optional byYoungestWoman_lastName;\r\n \r\n ToIntFunction byAge = p -> p.getAge();\r\n\r\n byYoungestMan_firstName = person.stream()\r\n .filter(e -> e.getGender() == Person.Sex.MALE)\r\n .sorted(comparing(byAge))\r\n .map(Person::getFirstName)\r\n .findFirst();\r\n\r\n byYoungestWoman_lastName = person.stream()\r\n .filter(e -> e.getGender() == Person.Sex.FEMALE)\r\n .sorted(comparing(byAge))\r\n .map(Person::getLastName)\r\n .findFirst();\r\n\r\n if (byYoungestMan_firstName.isPresent()) {\r\n System.out.println(byYoungestMan_firstName.get());\r\n }\r\n if (byYoungestWoman_lastName.isPresent()) {\r\n System.out.println(byYoungestWoman_lastName.get());\r\n }\r\n\r\n Optional fullName = byYoungestMan_firstName.flatMap(fn -> byYoungestWoman_lastName.map(ln -> String.join(\"@\", fn, ln)));\r\n if (fullName.isPresent()) {\r\n System.out.println(fullName.get()); \r\n }\r\n \r\n }\r\n\r\n}\r\n\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 <\/p>\n
\u5e02\u539f
\u54b2
\u5e02\u539f@\u54b2<\/p>\n
\u671f\u5f85\u901a\u308a\u306b\u52d5\u3044\u3066\u308b\u3051\u3069\u3053\u308c\u304c\u53ef\u80fd\u306b\u306a\u308b\u3053\u3068\u304c Java \u306a\u4eba\u306b\u306f\u91cd\u8981\u306a\u3053\u3068\u306a\u3093\u3060\u308d\u3046\u304b\uff1f<\/p>\n
\u30e2\u30ca\u30c9\u3092\u7f8e\u5473\u3057\u304f\u3044\u305f\u3060\u3051\u304f\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u79c1\u306b\u306f\u30a4\u30de\u30a4\u30c1\u7406\u89e3\u304c\u3067\u304d\u306a\u3044\u3067\u3059\u3002<\/p>\n
\u3082\u3057\u3053\u308c\u304c\u91cd\u8981\u306a\u3053\u3068\u3060\u3068\u3057\u305f\u3089\u305d\u306e\u3046\u3061\u8ab0\u304b\u304c\u8a18\u4e8b\u306b\u3057\u3066\u71b1\u304f\u8a9e\u3063\u3066\u304f\u308c\u308b\u3060\u308d\u3046\u3002<\/p>\n
<\/a><\/div>\n 
<\/a><\/div>\n