﻿{"id":685,"date":"2013-04-02T22:03:12","date_gmt":"2013-04-02T13:03:12","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=685"},"modified":"2013-04-24T20:12:13","modified_gmt":"2013-04-24T11:12:13","slug":"jdk8-lambda-%e3%81%9d%e3%81%ae%e4%bb%96%e3%81%84%e3%82%8d%e3%81%84%e3%82%8d%e3%80%80%e3%81%aa%e3%82%93%e3%81%a7%e3%82%82%e3%81%84%e3%81%84%e3%81%8b%e3%82%89%e5%8b%95%e3%81%8b%e3%81%97%e3%81%a6","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=685","title":{"rendered":"JDK8 Lambda \u305d\u306e\u4ed6\u3044\u308d\u3044\u308d\u3000\u306a\u3093\u3067\u3082\u3044\u3044\u304b\u3089\u52d5\u304b\u3057\u3066\u307f\u308b"},"content":{"rendered":"<p>\u4eca\u5e74\u306e\u4e5d\u6708\u4e5d\u65e5\u306b Java8 \u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u308b\u4e88\u5b9a\u306a\u306e\u3067\u3044\u308d\u3044\u308d\u30cd\u30c3\u30c8\u3067\u60c5\u5831\u3092GET\u3057\u3066\u306f\u89e3\u3089\u306a\u3044\u307e\u307e\u52d5\u304b\u3057\u3066\u904a\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u307e\u305f\u3082\u3084\u30b0\u30c3\u30c9\u306a\u60c5\u5831\u6e90\u3092\u5f97\u305f\u306e\u3067\u305d\u308c\u3092\u5143\u306b\u3044\u308d\u3044\u308d\u52d5\u304b\u3057\u3066\u81ea\u5df1\u6e80\u8db3\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002(\uffe3\u3002\uffe3;)<\/p>\n<p>\u60c5\u5831\u6e90\u306f\u82f1\u8a9e\u306a\u306e\u3067\u8a73\u3057\u3044\u3053\u3068\u306f\u89e3\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305f\u3060\u300c\u9580\u524d\u306e\u5c0f\u50e7\u7fd2\u308f\u306c\u7d4c\u3092\u8aad\u3080\u300d\u306e\u3088\u3046\u306b\u3072\u305f\u3059\u3089\u30b5\u30f3\u30d7\u30eb\u3092\u62fe\u3044\u96c6\u3081\u3066 Java8 \u306e\u30ea\u30ea\u30fc\u30b9\u307e\u3067\u306b\u5c11\u3057\u3067\u3082\u65b0\u6a5f\u80fd\u306b\u99b4\u67d3\u3093\u3067\u3044\u3053\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u3088\u3063\u3066\u3001\u8a73\u3057\u3044\u89e3\u8aac\uff08\u7c21\u5358\u306a\u89e3\u8aac\u3082\uff09\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u307e\u3060\u4ed5\u69d8\u304c\u78ba\u5b9a\u3057\u3066\u3044\u308b\u8a33\u3067\u306f\u306a\u3044\u3057\u3001\u30d0\u30b0\u3082\u305f\u304f\u3055\u3093\u3042\u308b\u3067\u3057\u3087\u3046\u304b\u3089\u5fd9\u3057\u3044\u4eba\u306f\u308f\u3056\u308f\u3056\u6b63\u5f0f\u30ea\u30ea\u30fc\u30b9\u524d\u306e\u3082\u306e\u306b\u6642\u9593\u3092\u8cbb\u3084\u3059\u5fc5\u8981\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u79c1\u306f\u65b0\u3057\u3044\u30e2\u30ce\u597d\u304d\u306a\u306e\u3067\u89e3\u3089\u306a\u304f\u3066\u3082\u89e6\u3063\u3066\u307f\u305f\u3044\u6027\u5206\u306a\u306e\u3067\u7a81\u3063\u8d70\u308a\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<style type=\"text\/css\">\n<!--\ntable {color: #000000; background-color: #e9e8e2; font-family: \u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09}\n-->\n<\/style>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">mylambdaexamples\\MyLambdaExamples.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage mylambdaexamples;\r\n\r\nimport java.time.LocalDate;\r\nimport java.util.LinkedHashSet;\r\nimport java.util.stream.Stream;\r\nimport static java.util.Arrays.asList;\r\n\r\npublic class MyLambdaExamples {\r\n\r\n    public static void main(String[] args) {\r\n        \/\/ Person \u8868\u793a\r\n        System.out.println(\"\\n<-- Person \u8868\u793a -->\");\r\n        persons.forEach((e) -> {\r\n            e.printPerson();\r\n        });\r\n    }\r\n    \/\/ Persons\r\n    private static final Person kyouhei = new Person(\"\u67f4\u7530\", \"\u606d\u5e73\", LocalDate.of(1951, 8, 18), Person.Sex.MALE);\r\n    private static final Person mitsu = new Person(\"\u58c7\", \"\u871c\", LocalDate.of(1980, 12, 3), Person.Sex.FEMALE);\r\n    private static final Person keiko = new Person(\"\u5317\u5ddd\", \"\u666f\u5b50\", LocalDate.of(1986, 8, 22), Person.Sex.FEMALE);\r\n    private static final Person haruka = new Person(\"\u7dbe\u702c\", \"\u306f\u308b\u304b\", LocalDate.of(1985, 3, 24), Person.Sex.FEMALE);\r\n    private static final Person nozomi = new Person(\"\u4f50\u3005\u6728\", \"\u5e0c\", LocalDate.of(1988, 2, 8), Person.Sex.FEMALE);\r\n    private static final Person ayame = new Person(\"\u525b\u529b\", \"\u5f69\u82bd\", LocalDate.of(1992, 8, 27), Person.Sex.FEMALE);\r\n    private static final Person syun = new Person(\"\u5c0f\u6817\", \"\u65ec\", LocalDate.of(1982, 12, 26), Person.Sex.MALE);\r\n    private static final Person maki = new Person(\"\u5800\u5317\", \"\u771f\u5e0c\", LocalDate.of(1988, 10, 6), Person.Sex.FEMALE);\r\n    private static final Person saki = new Person(\"\u6b66\u4e95\", \"\u54b2\", LocalDate.of(1993, 12, 25), Person.Sex.FEMALE);\r\n    private static final Person hayato = new Person(\"\u5e02\u539f\", \"\u96bc\u4eba\", LocalDate.of(1987, 2, 6), Person.Sex.MALE);\r\n    private static final Person kyouko = new Person(\"\u6df1\u7530\", \"\u606d\u5b50\", LocalDate.of(1982, 11, 2), Person.Sex.FEMALE);\r\n    \/\/ Wristwatches\r\n    private static final Wristwatch rolex = new Wristwatch(\"\u30ed\u30ec\u30c3\u30af\u30b9\", \"\u30d7\u30ec\u30b7\u30b8\u30e7\u30f3\", 1_950, 800_000);\r\n    private static final Wristwatch cartier = new Wristwatch(\"\u30ab\u30eb\u30c6\u30a3\u30a8\", \"\u30de\u30b9\u30c8\u30bf\u30f3\u30af\", 1_980, 500_000);\r\n    private static final Wristwatch tiffany = new Wristwatch(\"\u30c6\u30a3\u30d5\u30a1\u30cb\u30fc\", \"\u30dd\u30fc\u30bb\u30ea\u30f3\", 1_920, 1_500_000);\r\n    private static final Wristwatch tudor = new Wristwatch(\"\u30c1\u30e5\u30fc\u30c9\u30eb\", \"\u30ab\u30e1\u30ec\u30aa\u30f3\", 1_960, 650_000);\r\n    private static final Wristwatch omega = new Wristwatch(\"\u30aa\u30e1\u30ac\", \"\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u30c7\u30d3\u30eb\", 1_960, 600_000);\r\n    \/\/ Sales\r\n    private static final Sale kyouhei_From_mitsu = new Sale(kyouhei, mitsu, rolex, 400_000);\r\n    private static final Sale keiko_From_haruka = new Sale(keiko, haruka, cartier, 250_000);\r\n    private static final Sale nozomi_From_ayame = new Sale(nozomi, ayame, tudor, 330_000);\r\n    private static final Sale maki_From_syun = new Sale(maki, syun, omega, 300_000);\r\n    private static final Sale kyouko_From_hayato = new Sale(kyouko, hayato, tiffany, 1_000_000);\r\n    private static final Sale kyouko_From_saki = new Sale(kyouko, saki, tiffany, 900_000);\r\n    private static final Sale kyouko_From_keiko = new Sale(kyouko, keiko, cartier, 200_000);\r\n    private static final Sale kyouko_From_haruka = new Sale(kyouko, haruka, rolex, 300_000);\r\n    private static final Sale kyouhei_From_haruka = new Sale(kyouko, haruka, tiffany, 800_000);\r\n    private static final Sale saki_From_haruka = new Sale(saki, haruka, omega, 300_000);\r\n    private static final Sale haruka_From_kyouko = new Sale(haruka, kyouko, tudor, 400_000);\r\n    \/\/ Collections\r\n    private static final Stream<Person> persons = new LinkedHashSet<>(asList(\r\n            kyouhei,\r\n            mitsu,\r\n            keiko,\r\n            haruka,\r\n            nozomi,\r\n            ayame,\r\n            syun,\r\n            maki,\r\n            saki,\r\n            hayato,\r\n            kyouko)).stream();\r\n    private static final Stream<Wristwatch> wristwatches = new LinkedHashSet<>(asList(\r\n            rolex,\r\n            cartier,\r\n            tiffany,\r\n            tudor,\r\n            omega)).stream();\r\n    private static final Stream<Sale> sales = new LinkedHashSet<>(asList(\r\n            kyouhei_From_mitsu,\r\n            keiko_From_haruka,\r\n            nozomi_From_ayame,\r\n            maki_From_syun,\r\n            kyouko_From_hayato,\r\n            kyouko_From_saki,\r\n            kyouko_From_keiko,\r\n            kyouko_From_haruka,\r\n            kyouhei_From_haruka,\r\n            saki_From_haruka,\r\n            haruka_From_kyouko)).stream();\r\n}\r\n<\/pre>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">mylambdaexamples\\Person.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage mylambdaexamples;\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\r\n    public Person(String firstName, String lastName, LocalDate birthday, Sex gender) {\r\n        this.firstName = firstName;\r\n        this.lastName = lastName;\r\n        this.birthday = birthday;\r\n        this.gender = gender;\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());\r\n    }\r\n}\r\n\r\n<\/pre>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">mylambdaexamples\\Sale.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage mylambdaexamples;\r\n\r\npublic class Sale {\r\n\r\n    Person buyer;\r\n    Person seller;\r\n    Wristwatch wristwatch;\r\n    double cost;\r\n\r\n    public Sale(Person buyer, Person seller, Wristwatch wristwatch, double cost) {\r\n        this.buyer = buyer;\r\n        this.seller = seller;\r\n        this.wristwatch = wristwatch;\r\n        this.cost = cost;\r\n    }\r\n\r\n    public Person getBuyer() {\r\n        return buyer;\r\n    }\r\n\r\n    public Person getSeller() {\r\n        return seller;\r\n    }\r\n\r\n    public Wristwatch getWristwatch() {\r\n        return wristwatch;\r\n    }\r\n\r\n    public double getCost() {\r\n        return cost;\r\n    }\r\n}\r\n\r\n<\/pre>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">mylambdaexamples\\Wristwatch.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage mylambdaexamples;\r\n\r\npublic class Wristwatch {\r\n    String brand;\r\n    String model;\r\n    int year;\r\n    double originalTalue;\r\n\r\n    public Wristwatch(String brand, String model, int year, double originalTalue) {\r\n        this.brand = brand;\r\n        this.model = model;\r\n        this.year = year;\r\n        this.originalTalue = originalTalue;\r\n    }\r\n\r\n    public String getBrand() {\r\n        return brand;\r\n    }\r\n\r\n    public String getModel() {\r\n        return model;\r\n    }\r\n\r\n    public int getYear() {\r\n        return year;\r\n    }\r\n\r\n    public double getOriginalTalue() {\r\n        return originalTalue;\r\n    }\r\n    \r\n}\r\n\r\n<\/pre>\n<p>\u9577\u304f\u3066\u3059\u307f\u307e\u305b\u3093\u3002(\uff9f\uff9f)(\uff61\uff61)\uff8d\uff9f\uff7a\uff6f<\/p>\n<p>\u4eca\u65e5\u306f Person \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8981\u7d20\u3092\u5168\u3066\u8868\u793a\u3055\u305b\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u3048\u3063\u3001\u3061\u3087\u3063\u3068\u524d\u306b\u540c\u3058\u3088\u3046\u306a\u306e\u898b\u305f\u3063\u3066\uff1f<\/p>\n<p>\u6c17\u306e\u305b\u3044\u3067\u3059\uff01(&gt;_&lt;)<\/p>\n<p>\u307e\u3041\u3001\u6163\u308c\u308b\u305f\u3081\u306b\u4f55\u56de\u3067\u3082\u30fb\u30fb\u30fb<\/p>\n<pre start-line=\"26\">\r\n\/\/ Person \u8868\u793a\r\nSystem.out.println(\"\\n<-- Person \u8868\u793a -->\");\r\npersons.forEach((e) -> {\r\n    e.printPerson();\r\n});\r\n<\/pre>\n<p>forEach \u3092\u4f7f\u3063\u3066 Person \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5168\u8981\u7d20\u3092\u8868\u793a\u3057\u3066\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>&lt;&#8211; Person \u8868\u793a &#8211;&gt;<br \/>\u67f4\u7530 \u606d\u5e73, 61\u6b73, Gender: MALE<br \/>\u58c7 \u871c, 32\u6b73, Gender: FEMALE<br \/>\u5317\u5ddd \u666f\u5b50, 26\u6b73, Gender: FEMALE<br \/>\u7dbe\u702c \u306f\u308b\u304b, 28\u6b73, Gender: FEMALE<br \/>\u4f50\u3005\u6728 \u5e0c, 25\u6b73, Gender: FEMALE<br \/>\u525b\u529b \u5f69\u82bd, 20\u6b73, Gender: FEMALE<br \/>\u5c0f\u6817 \u65ec, 30\u6b73, Gender: MALE<br \/>\u5800\u5317 \u771f\u5e0c, 24\u6b73, Gender: FEMALE<br \/>\u6b66\u4e95 \u54b2, 19\u6b73, Gender: FEMALE<br \/>\u5e02\u539f \u96bc\u4eba, 26\u6b73, Gender: MALE<br \/>\u6df1\u7530 \u606d\u5b50, 30\u6b73, Gender: FEMALE<\/p>\n<p>\u3068\u3066\u3082\u7d20\u6575\u3067\u3059\u306d\u3002(^_^)<\/p>\n<p>\u6b21\u56de\u306f\u3053\u308c\u3092\u30d9\u30fc\u30b9\u306b\u4f55\u304b\u3057\u307e\u3059\uff08\u30f2\u30d2<\/p>\n<p><strike>\u7d9a\u304d\u306f Web \u3067\uff01<\/strike><\/p>\n<div id=\"scid:0767317B-992E-4b12-91E0-4F059A8CECA8:79390e5e-a7d8-4e69-abc7-023b8f92329b\" class=\"wlWriterEditableSmartContent\" style=\"float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px\">Hatena \u30bf\u30b0: <a href=\"http:\/\/b.hatena.ne.jp\/t\/Java\" rel=\"tag\">Java<\/a><\/div>\n<div class='wp_social_bookmarking_light'>\n            <div class=\"wsbl_hatena\"><a href='\/\/b.hatena.ne.jp\/add?mode=confirm&url=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D685&title=JDK8%20Lambda%20%E3%81%9D%E3%81%AE%E4%BB%96%E3%81%84%E3%82%8D%E3%81%84%E3%82%8D%E3%80%80%E3%81%AA%E3%82%93%E3%81%A7%E3%82%82%E3%81%84%E3%81%84%E3%81%8B%E3%82%89%E5%8B%95%E3%81%8B%E3%81%97%E3%81%A6%E3%81%BF%E3%82%8B' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' rel=nofollow class='wp_social_bookmarking_light_a' target=_blank><img src='http:\/\/yucchi.jp\/blog\/wp-content\/plugins\/wp-social-bookmarking-light\/public\/images\/hatena.gif' alt='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' width='16' height='12' class='wp_social_bookmarking_light_img' \/><\/a><\/div>\n            <div class=\"wsbl_facebook\"><a 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data-url=\"http:\/\/yucchi.jp\/blog\/?p=685\" data-text=\"JDK8 Lambda \u305d\u306e\u4ed6\u3044\u308d\u3044\u308d\u3000\u306a\u3093\u3067\u3082\u3044\u3044\u304b\u3089\u52d5\u304b\u3057\u3066\u307f\u308b\" data-lang=\"ja\">Tweet<\/a><\/div>\n    <\/div>\n<br class='wp_social_bookmarking_light_clear' \/>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5e74\u306e\u4e5d\u6708\u4e5d\u65e5\u306b Java8 \u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u308b\u4e88\u5b9a\u306a\u306e\u3067\u3044\u308d\u3044\u308d\u30cd\u30c3\u30c8\u3067\u60c5\u5831\u3092GET\u3057\u3066\u306f\u89e3\u3089\u306a\u3044\u307e\u307e\u52d5\u304b\u3057\u3066\u904a\u3093\u3067\u3044\u307e\u3059\u3002 \u3068\u3044\u3046\u3053\u3068\u3067\u3001\u307e\u305f\u3082\u3084\u30b0\u30c3\u30c9\u306a\u60c5\u5831\u6e90\u3092\u5f97\u305f\u306e\u3067\u305d\u308c\u3092\u5143\u306b\u3044\u308d\u3044\u308d\u52d5\u304b\u3057\u3066\u81ea\u5df1\u6e80\u8db3\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002(\uffe3\u3002\uffe3;) 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