{"id":119,"date":"2012-06-06T09:16:14","date_gmt":"2012-06-06T00:16:14","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=119"},"modified":"2013-04-24T22:27:09","modified_gmt":"2013-04-24T13:27:09","slug":"%e3%81%af%e3%81%98%e3%82%81%e3%81%a6%e3%81%ae-lambda-vol-4","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=119","title":{"rendered":"\u306f\u3058\u3081\u3066\u306e Lambda vol.4"},"content":{"rendered":"<p><font size=\"3\">\u306f\u3058\u3081\u3066\u306e Lambda \u30b7\u30ea\u30fc\u30ba\u30824\u56de\u76ee\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u4eca\u56de\u306f Method Reference \u3092\u4f7f\u3063\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">Method Reference \u3063\u3066\u540d\u524d\u306e\u3068\u304a\u308a\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u30e1\u30bd\u30c3\u30c9\u306b\u5bfe\u3059\u308b\u53c2\u7167\u3060\u3051\u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u3088\u3063\u3066\u3001<font size=\"3\">\u306f\u3058\u3081\u3066\u306e Lambda vol.2 \u3067\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u6700\u5927\u5024\u3092\u6c42\u3081\u308b\u90e8\u5206\u3092<\/font><\/font><\/p>\n<p><font size=\"3\">Method Reference \u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u4e0b\u8a18\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u975e\u5e38\u306b\u7c21\u6f54\u306b\u306a\u308a\u307e\u3059\u3002(^_^)v<\/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 = 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                \/\/ Method Reference \u3092\u4f7f\u3046\u3088\u3046\u306b\u5909\u66f4\r\n                .reduce(0, Math::max);\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 color=\"#ff0000\" size=\"4\">Math::max <font color=\"#000000\" size=\"3\">\u306e\u90e8\u5206\u304c <font size=\"3\">Method Reference \u3092\u5229\u7528\u3057\u305f\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/font><\/font><\/font><\/p>\n<p><font size=\"3\">\u3053\u3093\u306a\u306b\u3059\u3063\u304d\u308a\u3057\u305f\u30b3\u30fc\u30c9\u3067\u672c\u5f53\u306b\u3061\u3083\u3093\u3068\u52d5\u304f\u306e\u304b\uff1f<\/font><\/p>\n<p><font size=\"3\">\u8a66\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2012\/06\/Method-Reference.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=\"Method Reference\" border=\"0\" alt=\"Method Reference\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2012\/06\/Method-Reference_thumb.png\" width=\"709\" height=\"772\"><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><font size=\"3\">\u304a\u304a\u3063\uff01\u3000\u3061\u3083\u3093\u3068\u52d5\u3044\u3066\u308b\u3058\u3083\u306a\u3044\u304b\uff01<\/font><\/p>\n<p><font size=\"3\">\u4e00\u6642\u671f\u3001<font size=\"3\">Method Reference \u306b <\/font><\/font><font size=\"3\"><font color=\"#0000ff\" size=\"4\"><strong><font size=\"5\">::<\/font> <\/strong><\/font>\u3068 <font color=\"#0000ff\" size=\"5\"><strong>#<\/strong><\/font> \u3069\u3061\u3089\u3092\u4f7f\u3046\u304b\u3067\u71b1\u3044\u8b70\u8ad6\u304c\u306a\u3055\u308c\u3066\u3044\u305f\u3002\uff08\u4eca\u3082\uff1f\uff09<\/font><\/p>\n<p><font size=\"3\">Java\u2122 Platform, Standard Edition 8 Developer Preview with Lambda Support\u3000b 39 \u3067\u306f<\/font><\/p>\n<p><font size=\"3\">:: (\u30c0\u30d6\u30eb\u30b3\u30ed\u30f3\uff09\u304c\u63a1\u7528\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">Java 8 \u3067 Lambda \u304c\u5b9f\u88c5\u3055\u308c\u305f\u3089\u99b4\u67d3\u307f\u306e\u306a\u3044\u7d20\u6575\u306a\u30b3\u30fc\u30c9\u3092\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306a\u6c17\u304c\u3057\u307e\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-4b12-91E0-4F059A8CECA8:47990282-1fd3-43a1-8ff3-77ac0aa05b5d\" 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%3D119&title=%E3%81%AF%E3%81%98%E3%82%81%E3%81%A6%E3%81%AE%20Lambda%20vol.4' 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%3D119&t=%E3%81%AF%E3%81%98%E3%82%81%E3%81%A6%E3%81%AE%20Lambda%20vol.4' 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=119\" ><\/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=119\" data-text=\"\u306f\u3058\u3081\u3066\u306e Lambda vol.4\" data-lang=\"ja\">Tweet<\/a><\/div>\n    <\/div>\n<br class='wp_social_bookmarking_light_clear' \/>\n","protected":false},"excerpt":{"rendered":"<p>\u306f\u3058\u3081\u3066\u306e Lambda \u30b7\u30ea\u30fc\u30ba\u30824\u56de\u76ee\u3068\u306a\u308a\u307e\u3057\u305f\u3002 \u4eca\u56de\u306f Method Reference \u3092\u4f7f\u3063\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002 Method Reference \u3063\u3066\u540d\u524d\u306e\u3068\u304a\u308a\u30e1\u30bd\u30c3\u30c9\u53c2\u7167\u3067\u3059\u3002 \u30e1\u30bd\u30c3\u30c9\u306b\u5bfe\u3059\u308b\u53c2\u7167\u3060\u3051\u3067\u3059\u3002 \u3088\u3063\u3066\u3001\u306f\u3058\u3081\u3066\u306e Lambda vol.2 \u3067\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u6700\u5927\u5024\u3092\u6c42\u3081\u308b\u90e8\u5206\u3092 Method Reference \u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u4e0b\u8a18\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u975e\u5e38\u306b\u7c21\u6f54\u306b\u306a\u308a\u307e\u3059\u3002(^_^)v jp\\yucchi\\hello_lambda_2\\Hello_Lambda_2.java package jp.yucchi.hello_lambda_2; imp\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-119","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\/119","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=119"}],"version-history":[{"count":3,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/119\/revisions"}],"predecessor-version":[{"id":845,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/119\/revisions\/845"}],"wp:attachment":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=119"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}