{"id":1939,"date":"2022-02-13T22:32:48","date_gmt":"2022-02-13T14:32:48","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=1939"},"modified":"2022-02-13T22:32:48","modified_gmt":"2022-02-13T14:32:48","slug":"%e8%bf%87%e6%bb%a4%e5%99%a8%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=1939","title":{"rendered":"\u8fc7\u6ee4\u5668\u6a21\u5f0f"},"content":{"rendered":"\n<p>\u8fd9\u4e2a\u6a21\u5f0f\uff0c\u76ee\u524d\u7684\u7684\u7406\u89e3\uff0c\u611f\u89c9\u5c31\u662f\u7528\u6765\u505a\u4e00\u4e9b\u96c6\u5408\u5206\u7ec4\uff0c\u8fc7\u6ee4\u7b49\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982java8 \u79cd\u7684stream\u6d41\uff0cfilter\u8fc7\u6ee4\u5668<\/p>\n\n\n\n<p><a href=\"https:\/\/www.runoob.com\/design-pattern\/filter-pattern.html\">\u8fc7\u6ee4\u5668\u6a21\u5f0f | \u83dc\u9e1f\u6559\u7a0b (runoob.com)<\/a><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u8fc7\u6ee4\u6a21\u5f0f\u7684\u5b9e\u73b0\u5728java8\u91cc\u9762\u6709\u5178\u578b\u7684\u5e94\u7528\u65b9\u6cd5\u5c31\u662f\u5206\u7ec4\u64cd\u4f5c\uff0c\u53ef\u4ee5\u6839\u636e\u6307\u5b9a\u7684\u6307\u6807\u8fdb\u884c\u5206\u7ec4\u7b5b\u9009\u3002\n\nMap&lt;Integer, List&lt;Person >> groupMap = persons.stream().collect(Collectors.groupingBy(Person::getGender));\ngroupMap.forEach((k, v) -> {\n    System.out.println(k);\n    v.forEach(System.out::println);\n});\n\u5f97\u5230\u7684\u7ed3\u679c\u5f62\u5f0f\u5c31\u662f\uff1a\n\n k\uff1a\u662f\u5206\u7ec4\u7684\u6307\u6807\uff0c\u4e0a\u9762\u4ee3\u7801\u4e2d\u7684 gender\n v\uff1a\u662f\u4e00\u4e2alist\u7684\u96c6\u5408\u5bf9\u8c61\uff0c\u5c31\u662f personList<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">List&lt;String> aList = Lists.newArrayList(\"1\",\"2\",\"\");\naList.stream().filter(x -> StringUtils.isNotEmpty(x))\n<\/pre>\n\n\n\n<p>\u540e\u7eed\u7ee7\u7eed\u8865\u5145\uff5e<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e2a\u6a21\u5f0f\uff0c\u76ee\u524d\u7684\u7684\u7406\u89e3\uff0c\u611f\u89c9\u5c31\u662f\u7528\u6765\u505a\u4e00\u4e9b\u96c6\u5408\u5206\u7ec4\uff0c\u8fc7\u6ee4\u7b49\u7684\u64cd\u4f5c\u3002 \u6bd4\u5982java8 \u79cd\u7684stream\u6d41\uff0cfil [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[131],"tags":[],"_links":{"self":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1939"}],"collection":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1939"}],"version-history":[{"count":2,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1939\/revisions"}],"predecessor-version":[{"id":1941,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1939\/revisions\/1941"}],"wp:attachment":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}