{"id":874,"date":"2013-04-30T16:07:49","date_gmt":"2013-04-30T07:07:49","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=874"},"modified":"2013-04-30T17:05:07","modified_gmt":"2013-04-30T08:05:07","slug":"%e3%82%82%e3%81%a3%e3%81%a8-lambda-%e3%81%9d%e3%81%ae%ef%bc%94","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=874","title":{"rendered":"\u3082\u3063\u3068 Lambda \u305d\u306e\uff14"},"content":{"rendered":"

\u6b63\u5f0f\u7248\u306e\u30ea\u30ea\u30fc\u30b9\u304c\uff12\uff10\uff11\uff14\u5e74\uff13\u6708\uff11\uff18\u65e5\u306b\u5ef6\u671f\u3055\u308c\u305f Java8 \u306e Lambda \u3092\u4eca\u56de\u3082\u697d\u3057\u3093\u3067\u307f\u307e\u3059\u3002<\/p>\n

\u3044\u3064\u3082\u306e\u3088\u3046\u306b\u30cd\u30c3\u30c8\u304b\u3089\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3066\u5c11\u3057\u30b3\u30fc\u30c9\u3092\u5909\u3048\u3066\u52d5\u304b\u3057\u3066\u3044\u308b\u3060\u3051\u306e\u5199\u7d4c\u306e\u3088\u3046\u306a\u3053\u3068\u3092\u3084\u3063\u3066\u307e\u3059\u3002<\/p>\n

\u8a73\u3057\u3044\u3053\u3068\u306f\u89e3\u3089\u306a\u3044\u3051\u3069\u6163\u308c\u308b\u3063\u3066\u3053\u3068\u304c\u76ee\u7684\u3067\u3059\uff01<\/p>\n

\u4eca\u56de\u306f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3042\u308b Template Method Pattern \u3092 Lambda \u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3057\u3066\u307f\u308b\u8a66\u307f\u3067\u3059\u3002<\/p>\n

Template Method Pattern \u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3051\u308c\u3070\u30b0\u30fc\u30b0\u30eb\u5148\u751f\u306b\u805e\u3044\u3066\u307f\u305f\u3089\u3044\u3063\u3071\u3044\u7b54\u3048\u3092\u6559\u3048\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n

Wikipedia \u3067\u306f\u3001Template Method \u30d1\u30bf\u30fc\u30f3\uff08\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30fb\u30e1\u30bd\u30c3\u30c9\u30fb\u30d1\u30bf\u30fc\u30f3\uff09\u3068\u306f\u3001GoF(Gang of Four; 4\u4eba\u306e\u30ae\u30e3\u30f3\u30b0\u305f\u3061)\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e1\u3064\u3067\u3042\u308b\u3002<\/strong><\/p>\n

\u300c\u632f\u308b\u821e\u3044\u306b\u95a2\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u300d\u306b\u5c5e\u3059\u308b\u3002Template Method \u30d1\u30bf\u30fc\u30f3\u306e\u76ee\u7684\u306f\u3001\u3042\u308b\u51e6\u7406\u306e\u304a\u304a\u307e\u304b\u306a\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u3042\u3089\u304b\u3058\u3081\u6c7a\u3081\u3066\u304a\u3044\u3066\u3001<\/strong><\/p>\n

\u305d\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5177\u4f53\u7684\u306a\u8a2d\u8a08\u3092\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u4efb\u305b\u308b\u3053\u3068\u3067\u3042\u308b\u3002<\/strong><\/p>\n

\u305d\u306e\u305f\u3081\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u69cb\u7bc9\u3059\u308b\u305f\u3081\u306e\u624b\u6bb5\u3068\u3057\u3066\u3088\u304f\u6d3b\u7528\u3055\u308c\u308b\u3002<\/strong><\/p>\n

\u3068\u8a18\u8f09\u3055\u308c\u3066\u307e\u3059\u3002<\/p>\n

\u4eca\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u306f\u73fe\u5728\u306e\u65e5\u4ed8\u3068\u305d\u308c\u305e\u308c\uff13\uff10\u65e5\u5f8c\u3001\uff16\uff10\u65e5\u5f8c\u306e\u65e5\u4ed8\u3092\u8868\u793a\u3055\u305b\u3001\u3064\u3044\u3067\u306b\u3064\u307e\u3089\u306a\u3044\u30e1\u30c3\u30bb\u30fc\u30b8\u3082\u8868\u793a\u3055\u305b\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n

\u305d\u308c\u3067\u306f Lambda \u3092\u4f7f\u308f\u306a\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002(Java8 \u306e\u65b0\u6a5f\u80fd\u306e Date and Time API \u306f\u4f7f\u3063\u3066\u307e\u3059\u3002)<\/p>\n

\r\npackage jp.yucchi.oldtemplatemethodpattern;\r\n\r\nimport java.time.LocalDate;\r\n\r\nabstract class DateCalc {\r\n\r\n    void getNowDate() {\r\n        System.out.println(\"\u4eca\u65e5\u306f \" + LocalDate.now() + \" \u3067\u3059\u3002\");\r\n    }\r\n\r\n    protected abstract void getTargetDate();\r\n\r\n    void saySorry() {\r\n        System.out.println(\"\u30ef\u30a4\u30eb\u30c9\u3060\u308d\u3045 \u3054\u3081\u3093\u306d\u3002\u3053\u3093\u306a\u30b5\u30f3\u30d7\u30eb\u3067 (\u30ce\u0414`)\\n\");\r\n    }\r\n}\r\n\r\n<\/pre>\n
package jp.yucchi.oldtemplatemethodpattern;\r\n\r\nimport java.time.LocalDate;\r\n\r\nclass DateCalcImpl_1 extends DateCalc {\r\n\r\n    @Override\r\n    protected void getTargetDate() {\r\n        System.out.println(\"\uff13\uff10\u65e5\u5f8c\u306f\" + LocalDate.now().plusDays(30) + \" \u3067\u3059\u3002\");\r\n    }\r\n}<\/pre>\n
package jp.yucchi.oldtemplatemethodpattern;\r\n\r\nimport java.time.LocalDate;\r\n\r\nclass DateCalcImpl_2 extends DateCalc {\r\n\r\n    @Override\r\n    protected void getTargetDate() {\r\n        System.out.println(\"\uff16\uff10\u65e5\u5f8c\u306f\" + LocalDate.now().plusDays(60) + \" \u3067\u3059\u3002\");\r\n    }\r\n}<\/pre>\n
 <\/p>\n
package jp.yucchi.oldtemplatemethodpattern;\r\n\r\npublic class OldTemplateMethodPattern {\r\n\r\n    public static void main(String[] args) {\r\n        printTargetDate(new DateCalcImpl_1());\r\n        printTargetDate(new DateCalcImpl_2());\r\n    }\r\n\r\n    private static void printTargetDate(DateCalcImpl_1 dateCalcImpl_1) {\r\n        dateCalcImpl_1.getNowDate();\r\n        dateCalcImpl_1.getTargetDate();\r\n        dateCalcImpl_1.saySorry();\r\n    }\r\n\r\n    private static void printTargetDate(DateCalcImpl_2 dateCalcImpl_2) {\r\n        dateCalcImpl_2.getNowDate();\r\n        dateCalcImpl_2.getTargetDate();\r\n        dateCalcImpl_2.saySorry();\r\n    }\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4eca\u65e5\u306f 2013-04-30 \u3067\u3059\u3002
\n\uff13\uff10\u65e5\u5f8c\u306f2013-05-30 \u3067\u3059\u3002
\n\u30ef\u30a4\u30eb\u30c9\u3060\u308d\u3045 \u3054\u3081\u3093\u306d\u3002\u3053\u3093\u306a\u30b5\u30f3\u30d7\u30eb\u3067 (\u30ce\u0414`)<\/p>\n
\u4eca\u65e5\u306f 2013-04-30 \u3067\u3059\u3002
\n\uff16\uff10\u65e5\u5f8c\u306f2013-06-29 \u3067\u3059\u3002
\n\u30ef\u30a4\u30eb\u30c9\u3060\u308d\u3045 \u3054\u3081\u3093\u306d\u3002\u3053\u3093\u306a\u30b5\u30f3\u30d7\u30eb\u3067 (\u30ce\u0414`)<\/p>\n
\u5f53\u7136\u306e\u7d50\u679c\u3067\u4f55\u3082\u554f\u984c\u306a\u3044\u3067\u3059\u306d\u3002<\/p>\n
\u5b9f\u969b\u306b\u306f\u3053\u306e\u3088\u3046\u306a\u5b9f\u88c5\u306f\u7121\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u304c\u4e00\u5fdc Template Method Pattern \u306e\u5b9a\u7fa9\u306b\u6cbf\u3063\u3066\u3044\u308b\u306e\u3067\u3088\u3057\u3068\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u305d\u308c\u3067\u306f\u3053\u306e\u30b3\u30fc\u30c9\u3092 Java8 \u306e Lambda \u3092\u4f7f\u3046\u3068\u3069\u3046\u306a\u308b\u304b\uff1f<\/p>\n
\u3053\u3093\u306a\u306b\u306a\u308a\u307e\u3057\u305f\uff5e\uff01 (*^o^*)<\/p>\n
package jp.yucchi.templatemethodpattern4lambda;\r\n\r\nimport java.time.LocalDate;\r\n\r\n@FunctionalInterface\r\npublic interface DateInterface {\r\n\r\n    default void getNowDate() {\r\n        System.out.println(\"\u4eca\u65e5\u306f \" + LocalDate.now() + \" \u3067\u3059\u3002\");\r\n    }\r\n\r\n    void getTargetDate();\r\n\r\n    default void saySorry() {\r\n        System.out.println(\"\u30ef\u30a4\u30eb\u30c9\u3060\u308d\u3045 \u3054\u3081\u3093\u306d\u3002\u3053\u3093\u306a\u30b5\u30f3\u30d7\u30eb\u3067 (\u30ce\u0414`)\\n\");\r\n    }\r\n}<\/pre>\n
 <\/p>\n
package jp.yucchi.templatemethodpattern4lambda;\r\n\r\nimport java.time.LocalDate;\r\n\r\npublic class TemplateMethodPattern4Lambda {\r\n\r\n    public static void main(String[] args) {\r\n        printTargetDate(() -> System.out.println(\"\uff13\uff10\u65e5\u5f8c\u306f\" + LocalDate.now().plusDays(30) + \" \u3067\u3059\u3002\"));\r\n        printTargetDate(() -> System.out.println(\"\uff16\uff10\u65e5\u5f8c\u306f\" + LocalDate.now().plusDays(60) + \" \u3067\u3059\u3002\"));\r\n    }\r\n\r\n    private static void printTargetDate(DateInterface dateInterface) {\r\n        dateInterface.getNowDate();\r\n        dateInterface.getTargetDate();\r\n        dateInterface.saySorry();\r\n    }\r\n\r\n}<\/pre>\n
\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4eca\u65e5\u306f 2013-04-30 \u3067\u3059\u3002
\n\uff13\uff10\u65e5\u5f8c\u306f2013-05-30 \u3067\u3059\u3002
\n\u30ef\u30a4\u30eb\u30c9\u3060\u308d\u3045 \u3054\u3081\u3093\u306d\u3002\u3053\u3093\u306a\u30b5\u30f3\u30d7\u30eb\u3067 (\u30ce\u0414`)<\/p>\n
\u4eca\u65e5\u306f 2013-04-30 \u3067\u3059\u3002
\n\uff16\uff10\u65e5\u5f8c\u306f2013-06-29 \u3067\u3059\u3002
\n\u30ef\u30a4\u30eb\u30c9\u3060\u308d\u3045 \u3054\u3081\u3093\u306d\u3002\u3053\u3093\u306a\u30b5\u30f3\u30d7\u30eb\u3067 (\u30ce\u0414`)<\/p>\n
\u3053\u3061\u3089\u3082\u5f53\u7136\u306e\u7d50\u679c\u3067\u4f55\u3082\u554f\u984c\u306a\u3044\u3067\u3059\u306d\u3002<\/p>\n
Lambda \u3092\u4f7f\u3046\u3068\u672c\u5f53\u306b\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u300c\u62bd\u8c61\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u3066\u306a\u3044\u3058\u3083\u306a\u3044\u304b\uff01\u300d\u3063\u3066\u6012\u3089\u306a\u3044\u3067\u306d\u3002(^_^;)<\/p>\n
DateInterface (FunctionalInterface) \u3067\u306e Default Methods \u304c\u4f7f\u3048\u308b\u306e\u304c\u826f\u3044\u3067\u3059\u306d\u3002<\/p>\n
\u3053\u308c\u3063\u3066 Java \u3067\u7981\u3058\u624b\u306e\u591a\u91cd\u7d99\u627f\u3092\u53ef\u80fd\u306b\u3059\u308b\u3088\u3046\u306a\u639f\u7834\u308a\u306e\u88cf\u6280\u306e\u3088\u3046\u306a\u6c17\u304c\u3057\u307e\u3059\u3002<\/p>\n
\u306a\u304b\u306a\u304b\u9762\u767d\u3044\u3067\u3059\u306d\u3002(^_^)<\/p>\n
\u305d\u308c\u3067\u306f\u3001\u304a\u7d04\u675f\u306e\u6642\u9593\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u300c\u3082\u3063\u3068 Lambda \u300d\u30b7\u30ea\u30fc\u30ba\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u5f97\u305f\u60c5\u5831\u3092\u5143\u306b\u305d\u308c\u3092\u5c11\u3057\u5909\u66f4\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n
\u60b2\u3057\u3044\u3053\u3068\u306b\u305d\u306e\u60c5\u5831\u6e90\u306f\u82f1\u8a9e\u306a\u306e\u3067\u8a73\u3057\u3044\u5185\u5bb9\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u3088\u3063\u3066\u79c1\u306e\u63a8\u6e2c\u3067\u89e3\u91c8\u3055\u308c\u305f\u5185\u5bb9\u3068\u306a\u3063\u3066\u307e\u3059\u306e\u3067\u9593\u9055\u3044\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
Java8 \u3082\u307e\u3060 build86 \u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u306e\u3067 API \u306e\u5909\u66f4\u306b\u3088\u308a\u8a18\u8ff0\u65b9\u6cd5\u304c\u5909\u308f\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u65e9\u304f\u6b63\u5f0f\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3066\u65e5\u672c\u8a9e\u3067\u3053\u306e\u8d85\u4fbf\u5229\u3067\u7d20\u6575\u306a\u65b0\u6a5f\u80fd\u3092\u52c9\u5f37\u3057\u305f\u3044\u4eca\u65e5\u3053\u306e\u9803\u3067\u3059\u3002<\/p>\n
\"cludia_2013_04_30_001\"<\/a><\/p>\n
Hatena \u30bf\u30b0: Java<\/a><\/div>\n
\n            
\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0<\/a><\/div>\n            
Facebook \u306b\u30b7\u30a7\u30a2<\/a><\/div>\n            
<\/g:plusone><\/div>\n            
Tweet<\/a><\/div>\n    <\/div>\n
\n","protected":false},"excerpt":{"rendered":"
\u6b63\u5f0f\u7248\u306e\u30ea\u30ea\u30fc\u30b9\u304c\uff12\uff10\uff11\uff14\u5e74\uff13\u6708\uff11\uff18\u65e5\u306b\u5ef6\u671f\u3055\u308c\u305f Java8 \u306e Lambda \u3092\u4eca\u56de\u3082\u697d\u3057\u3093\u3067\u307f\u307e\u3059\u3002 \u3044\u3064\u3082\u306e\u3088\u3046\u306b\u30cd\u30c3\u30c8\u304b\u3089\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3066\u5c11\u3057\u30b3\u30fc\u30c9\u3092\u5909\u3048\u3066\u52d5\u304b\u3057\u3066\u3044\u308b\u3060\u3051\u306e\u5199\u7d4c\u306e\u3088\u3046\u306a\u3053\u3068\u3092\u3084\u3063\u3066\u307e\u3059\u3002 \u8a73\u3057\u3044\u3053\u3068\u306f\u89e3\u3089\u306a\u3044\u3051\u3069\u6163\u308c\u308b\u3063\u3066\u3053\u3068\u304c\u76ee\u7684\u3067\u3059\uff01 \u4eca\u56de\u306f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u4e00\u3064\u3067\u3042\u308b Template Method Pattern \u3092 Lambda \u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3057\u3066\u307f\u308b\u8a66\u307f\u3067\u3059\u3002 Template Method Pattern \u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3051\u308c\u3070\u30b0\u30fc\u30b0\u30eb\u5148\u751f\u306b\u805e\u3044\u3066\u307f\u305f\u3089\u3044\u3063\u3071\u3044\u7b54\u3048\u3092\u6559\u3048\u3066\u304f\u308c\u307e\u3059\u3002 Wikipedia \u3067\u306f\u3001Template Method \u30d1\u30bf\u30fc\u30f3\uff08\u30c6\u30f3\u30d7\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-874","post","type-post","status-publish","format-standard","hentry","category-java","tag-java"],"_links":{"self":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/874","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=874"}],"version-history":[{"count":14,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/874\/revisions"}],"predecessor-version":[{"id":878,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/874\/revisions\/878"}],"wp:attachment":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=874"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=874"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}