{"id":94,"date":"2012-05-20T22:20:50","date_gmt":"2012-05-20T13:20:50","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=94"},"modified":"2013-04-24T22:33:34","modified_gmt":"2013-04-24T13:33:34","slug":"%e3%81%af%e3%81%98%e3%82%81%e3%81%a6%e3%81%ae-lambda-vol-2","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=94","title":{"rendered":"\u306f\u3058\u3081\u3066\u306e Lambda vol.2"},"content":{"rendered":"<p><font size=\"3\">\u4eca\u671d\u304b\u3089\u4f5c\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092 Lambda \u3092\u4f7f\u3046\u3088\u3046\u306b\u5909\u66f4\u3057\u3088\u3046\u3068\u3044\u308d\u3044\u308d\u8abf\u3079\u3066\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u305d\u3057\u305f\u3089\u4ee5\u524d Fork\/Join \u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u3064\u3044\u3066\u8abf\u3079\u3066\u3044\u305f\u3068\u304d\u306b\u767a\u898b\u3057\u305f\u30b3\u30fc\u30c9\u3092\u76ee\u306b\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u78ba\u304b IBM \u306e\u30b5\u30a4\u30c8\u306b\u3042\u3063\u305f\u8a18\u4e8b\u3060\u304c\u3069\u3046\u3084\u3089\u3061\u3087\u304f\u3061\u3087\u304f\u30b5\u30f3\u30d7\u30eb\u306b\u3042\u304c\u3063\u3066\u304f\u308b\u30b3\u30fc\u30c9\u3089\u3057\u3044\u3002<\/font><\/p>\n<p><font size=\"3\">\u65e5\u672c\u8a9e\u3067 Lambda \u306e\u89e3\u8aac\u3092\u3057\u3066\u304f\u308c\u3066\u3044\u308b\u30b5\u30a4\u30c8\u306b\u3082\u3042\u3063\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u3042\u308b\u5e74\u306e\u5b66\u751f\u306e\u30cf\u30a4\u30b9\u30b3\u30a2\u3092\u898b\u3064\u3051\u51fa\u3059\u30d7\u30ed\u30b0\u30e9\u30e0\u3060\u3002<\/font><\/p>\n<p><font size=\"3\">\u305d\u308c\u3092\u53c2\u8003\u306b\u3057\u3066\u3053\u3093\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u307f\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u4e00\u756a\u5927\u304d\u306a\u30d0\u30b9\u30c8\u3092\u8abf\u3079\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3060\u3002<\/font><\/p>\n<p><font size=\"3\">\u305f\u3060\u3057\u5e74\u9f62\u5236\u9650\u3092\u8a2d\u3051\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\uff11\uff16\u6b73\u4ee5\u4e0a\u3001\uff12\uff16\u6b73\u672a\u6e80\u3060\u3002<\/font><\/p>\n<p><font size=\"3\">Java 7 \u3067\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/font><\/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\">jp\\yucchi\\hello_lambda_2\\Hello_Lambda_2.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage jp.yucchi.hello_lambda_2;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class Hello_Lambda_2 {\r\n\r\n    public static void main(String[] args) {\r\n        List<Lady> ladies = new ArrayList<>();\r\n        ladies.add(new Lady(80, 20));\r\n        ladies.add(new Lady(70, 14));\r\n        ladies.add(new Lady(85, 30));\r\n        ladies.add(new Lady(90, 24));\r\n        ladies.add(new Lady(100, 10));\r\n        int maxBust = 0;\r\n        for (Lady l : ladies) {\r\n            if (l.age > 15 && l.age < 26) {\r\n                if (l.bustSize > maxBust) {\r\n                    maxBust = l.bustSize;\r\n                }\r\n            }\r\n        }\r\n        System.out.println(\"\uff11\uff16\u6b73\u4ee5\u4e0a\u3001\uff12\uff16\u6b73\u672a\u6e80\u3067\u4e00\u756a\u5927\u304d\u306a\u80f8\u306e\u30b5\u30a4\u30ba\u306f\" + maxBust + \"\u3067\u3059\u3002\");\r\n    }\r\n\r\n    private static class Lady {\r\n\r\n        int bustSize;\r\n        int age;\r\n\r\n        public Lady(int bustSize, int age) {\r\n            this.bustSize = bustSize;\r\n            this.age = age;\r\n        }\r\n    }\r\n}\r\n\r\n<\/pre>\n<p><font size=\"3\">\u5b9f\u884c\u7d50\u679c\u306f<\/font><\/p>\n<p>run:<br \/>\uff11\uff16\u6b73\u4ee5\u4e0a\u3001\uff12\uff16\u6b73\u672a\u6e80\u3067\u4e00\u756a\u5927\u304d\u306a\u80f8\u306e\u30b5\u30a4\u30ba\u306f90\u3067\u3059\u3002<br \/>\u69cb\u7bc9\u6210\u529f (\u5408\u8a08\u6642\u9593: 0 \u79d2)<\/p>\n<p><font size=\"3\">\u671f\u5f85\u901a\u308a\u306e\u7d50\u679c\u3068\u306a\u308a\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u6b21\u306b\u3053\u308c\u3092 Lambda \u3092\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002<\/font><\/p>\n<p>&nbsp;<\/p>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">jp\\yucchi\\hello_lambda_2\\Hello_Lambda_2.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage jp.yucchi.hello_lambda_2;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class Hello_Lambda_2 {\r\n\r\n    public static void main(String[] args) {\r\n        List<Lady> ladies = new ArrayList<>();\r\n        ladies.add(new Lady(80, 20));\r\n        ladies.add(new Lady(70, 14));\r\n        ladies.add(new Lady(85, 30));\r\n        ladies.add(new Lady(90, 24));\r\n        ladies.add(new Lady(100, 10));\r\n        int maxBust = ladies.filter(l -> l.age > 15 && l.age < 26)\r\n                .map(l -> l.bustSize)\r\n                .reduce(0, (left, right) -> Math.max(left, right));\r\n        System.out.println(\"\uff11\uff16\u6b73\u4ee5\u4e0a\u3001\uff12\uff16\u6b73\u672a\u6e80\u3067\u4e00\u756a\u5927\u304d\u306a\u80f8\u306e\u30b5\u30a4\u30ba\u306f\" + maxBust + \"\u3067\u3059\u3002\");\r\n    }\r\n\r\n    private static class Lady {\r\n\r\n        int bustSize;\r\n        int age;\r\n\r\n        public Lady(int bustSize, int age) {\r\n            this.bustSize = bustSize;\r\n            this.age = age;\r\n        }\r\n    }\r\n}\r\n\r\n<\/pre>\n<p><font size=\"3\">\u306a\u3093\u304b\u898b\u6163\u308c\u306a\u3044\u3082\u306e\u304c\u3061\u3089\u307b\u3089\u3042\u308a\u307e\u3059\u306d\u3002<\/font><\/p>\n<p><font size=\"3\">\u5b9f\u884c\u7d50\u679c\u306f<\/font><\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2012\/05\/2.png\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; border-right-width: 0px; padding-left: 0px; padding-right: 0px; display: inline; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px\" title=\"Hello_Lambda_2\" border=\"0\" alt=\"Hello_Lambda_2\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2012\/05\/2_thumb.png\" width=\"757\" height=\"772\"><\/a><\/p>\n<p><font size=\"3\">Good! (^^)<\/font><\/p>\n<p><font size=\"3\">\u3053\u306e\u90e8\u5206\u304c JDK 8 \u306e\u65b0\u5175\u5668 Lambda \u3067\u3059\u306d\u3002<\/font><\/p>\n<pre>\r\nint maxBust = ladies.filter(l -> l.age > 15 && l.age < 26)\r\n        .map(l -> l.bustSize)\r\n        .reduce(0, (left, right) -> Math.max(left, right));\r\n\r\n<\/pre>\n<p><font size=\"3\">\u898b\u6163\u308c\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u306e\u6b63\u4f53\u306f<\/font><\/p>\n<blockquote>\n<p><font size=\"3\"><font color=\"#0000ff\"><strong>filter \u30e1\u30bd\u30c3\u30c9<\/strong><\/font> : \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3092\u3059\u308b\u512a\u308c\u3082\u306e\u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u5f15\u6570\u306e Predicate \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e eval \u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u304c true \u306e\u8981\u7d20\u3060\u3051\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002<\/font><\/p>\n<\/blockquote>\n<p><font size=\"3\"><\/font>&nbsp;<\/p>\n<blockquote>\n<p><font size=\"3\"><font color=\"#0000ff\"><strong>map \u30e1\u30bd\u30c3\u30c9<\/strong><\/font> : \u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f5c\u308a\u76f4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">Mapper \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e map \u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3092\u65b0\u305f\u306a\u8981\u7d20\u3068\u3057\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f5c\u308a\u307e\u3059\u3002<\/font><\/p>\n<\/blockquote>\n<p>&nbsp;<\/p>\n<blockquote>\n<p><font size=\"3\"><font color=\"#0000ff\"><strong>reduce \u30e1\u30bd\u30c3\u30c9<\/strong><\/font><font color=\"#000000\"> : <\/font>\u8981\u7d20\u3092\u6e1b\u3089\u3057\u3066\u3001\u6700\u7d42\u7684\u306b\u4e00\u3064\u306b\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/font><\/p>\n<\/blockquote>\n<p><font size=\"3\">\u4ee5\u4e0a\u306e\u3088\u3046\u306b Lambda \u3092\u4f7f\u3046\u30dd\u30a4\u30f3\u30c8\u3092\u5c11\u3057\u3060\u3051\u77e5\u3063\u305f\u3064\u3082\u308a\u306b\u306a\u3063\u305f\u3002(^0^;)<\/font><\/p>\n<p><font size=\"3\">\u3082\u3063\u3068\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u53c2\u8003\u306b\u3055\u305b\u3066\u3044\u305f\u3060\u3044\u305f\u3068\u3044\u3046\u3088\u308a\u306f\u3001\u307e\u308b\u3063\u3068\u3044\u305f\u3060\u3044\u305f\u30b5\u30a4\u30c8\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/font><\/p>\n<p><a href=\"http:\/\/www.javainthebox.com\/2011\/12\/project-lambda.html\" target=\"_blank\"><font size=\"3\">Project Lambda<\/font><\/a><\/p>\n<p><font size=\"3\">\u3053\u3061\u3089\u306e\u30b5\u30a4\u30c8\u304c\u52c9\u5f37\u306b\u306a\u308a\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u305f\u3060\u3057\u3001\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30d1\u30e9\u30ec\u30eb\u51e6\u7406\u3092\u3059\u308b\u65b9\u6cd5\u3082\u8f09\u3063\u3066\u3044\u307e\u3057\u305f\u304c<\/font><\/p>\n<p><font size=\"3\">\u306a\u3093\u3068\u3000\u30a8\u30e9\u30fc\u3000\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">Lambda \u306f\u307e\u3060\u958b\u767a\u9014\u4e2d\u306a\u306e\u3067\u7d39\u4ecb\u3057\u305f\u30b5\u30a4\u30c8\u306e\u60c5\u5831\u3082\u3044\u3064\u307e\u3067\u6709\u52b9\u306a\u306e\u304b\u306f\u89e3\u308a\u307e\u305b\u3093\u3002<\/font><\/p>\n<p><font size=\"3\">\u65e5\u672c\u8a9e\u306e\u60c5\u5831\u306f\u307e\u3060\u307e\u3060\u5c11\u306a\u3044\u3088\u3046\u306a\u306e\u3067\u3001\u82f1\u8a9e\u304c\u5f97\u610f\u306a\u65b9\u306f\u82f1\u8a9e\u30b5\u30a4\u30c8\u3092\u30b0\u30b0\u3063\u3066\u60c5\u5831\u53ce\u96c6\u3057\u305f\u307b\u3046\u304c\u3044\u3044\u304b\u3082\u3067\u3059\u3002<\/font><\/p>\n<div style=\"padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; float: none; padding-top: 0px\" id=\"scid:0767317B-992E-4b12-91E0-4F059A8CECA8:d8cd1e78-da0b-4602-98f2-f181889ded8d\" class=\"wlWriterEditableSmartContent\">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%3D94&title=%E3%81%AF%E3%81%98%E3%82%81%E3%81%A6%E3%81%AE%20Lambda%20vol.2' 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 href='http:\/\/www.facebook.com\/share.php?u=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D94&t=%E3%81%AF%E3%81%98%E3%82%81%E3%81%A6%E3%81%AE%20Lambda%20vol.2' title='Facebook \u306b\u30b7\u30a7\u30a2' 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\/facebook.png' alt='Facebook \u306b\u30b7\u30a7\u30a2' title='Facebook \u306b\u30b7\u30a7\u30a2' width='16' height='16' class='wp_social_bookmarking_light_img' \/><\/a><\/div>\n            <div class=\"wsbl_google_plus_one\"><g:plusone size=\"medium\" annotation=\"none\" href=\"http:\/\/yucchi.jp\/blog\/?p=94\" ><\/g:plusone><\/div>\n            <div class=\"wsbl_twitter\"><a href=\"https:\/\/twitter.com\/share\" class=\"twitter-share-button\" data-url=\"http:\/\/yucchi.jp\/blog\/?p=94\" data-text=\"\u306f\u3058\u3081\u3066\u306e Lambda vol.2\" data-lang=\"ja\">Tweet<\/a><\/div>\n    <\/div>\n<br class='wp_social_bookmarking_light_clear' \/>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u671d\u304b\u3089\u4f5c\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092 Lambda \u3092\u4f7f\u3046\u3088\u3046\u306b\u5909\u66f4\u3057\u3088\u3046\u3068\u3044\u308d\u3044\u308d\u8abf\u3079\u3066\u305f\u3002 \u305d\u3057\u305f\u3089\u4ee5\u524d Fork\/Join \u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u3064\u3044\u3066\u8abf\u3079\u3066\u3044\u305f\u3068\u304d\u306b\u767a\u898b\u3057\u305f\u30b3\u30fc\u30c9\u3092\u76ee\u306b\u3057\u305f\u3002 \u78ba\u304b IBM \u306e\u30b5\u30a4\u30c8\u306b\u3042\u3063\u305f\u8a18\u4e8b\u3060\u304c\u3069\u3046\u3084\u3089\u3061\u3087\u304f\u3061\u3087\u304f\u30b5\u30f3\u30d7\u30eb\u306b\u3042\u304c\u3063\u3066\u304f\u308b\u30b3\u30fc\u30c9\u3089\u3057\u3044\u3002 \u65e5\u672c\u8a9e\u3067 Lambda \u306e\u89e3\u8aac\u3092\u3057\u3066\u304f\u308c\u3066\u3044\u308b\u30b5\u30a4\u30c8\u306b\u3082\u3042\u3063\u305f\u3002 \u3042\u308b\u5e74\u306e\u5b66\u751f\u306e\u30cf\u30a4\u30b9\u30b3\u30a2\u3092\u898b\u3064\u3051\u51fa\u3059\u30d7\u30ed\u30b0\u30e9\u30e0\u3060\u3002 \u305d\u308c\u3092\u53c2\u8003\u306b\u3057\u3066\u3053\u3093\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u307f\u305f\u3002 \u4e00\u756a\u5927\u304d\u306a\u30d0\u30b9\u30c8\u3092\u8abf\u3079\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3060\u3002 \u305f\u3060\u3057\u5e74\u9f62\u5236\u9650\u3092\u8a2d\u3051\u305f\u3002 \uff11\uff16\u6b73\u4ee5\u4e0a\u3001\uff12\uff16\u6b73\u672a\u6e80\u3060\u3002 Java 7 \u3067\u306e\u30b3\u30fc\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 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