{"id":4417,"date":"2019-07-16T14:39:53","date_gmt":"2019-07-16T06:39:53","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4417"},"modified":"2019-07-16T14:39:53","modified_gmt":"2019-07-16T06:39:53","slug":"%e8%af%b7%e5%ae%9e%e7%8e%b0%e4%b8%80%e7%a7%8d%e5%85%bc%e5%ae%b9set%e7%9a%84%e6%97%a0%e5%ba%8f%ef%bc%8clist%e7%9a%84%e5%8f%af%e9%87%8d%e5%a4%8d%e7%9a%84%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4417","title":{"rendered":"\u8bf7\u5b9e\u73b0\u4e00\u79cd\u517c\u5bb9Set\u7684\u65e0\u5e8f\uff0cList\u7684\u53ef\u91cd\u590d\u7684\u6570\u636e\u7ed3\u6784"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Java \u4e2d\uff0c\u63d0\u4f9b\u4e86\u5f88\u591a\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\u3002\u6bd4\u5982\uff0cMap\u3001List\u3001Set \u7b49\u3002\u4f46\u662f\uff0c\u5728\u5f88\u591a\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7edf\u8ba1\u67d0\u4e2a\u6570\u636e\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u8fd9\u65f6\u5f80\u5f80\u6211\u4eec\u7684\u5b9e\u73b0\u4ee3\u7801\u53ef\u80fd\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Map&lt;String, Integer&gt; counts = new HashMap&lt;String, Integer&gt;();\nfor (String key : words) {\n    Integer count = counts.get(key);\n    if (count == null) {\n        counts.put(key, 1);\n    } else {\n        counts.put(key, count + 1);\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5728\u591a\u4e2a\u9879\u76ee\uff0c\u6216\u8005\u662f\u4e00\u4e2a\u9879\u76ee\u4e2d\uff0c\u6709\u591a\u4e2a\u65b9\u6cd5\uff0c\u591a\u4e2a\u529f\u80fd\u9700\u8981\u8fd9\u79cd\u7edf\u8ba1\u529f\u80fd\u3002\u90a3\u4e48\u80fd\u4e0d\u80fd\u628a\u8fd9\u79cd\u5b9e\u73b0\uff0c\u62bd\u53d6\u6210\u4e00\u4e2a\u65b0\u7684\u6570\u636e\u7ed3\u6784\uff0c\u65b9\u4fbf\u6211\u4eec\u5728\u4efb\u4f55\u5730\u65b9\u4f7f\u7528\uff1f\u8fd9\u5c31\u662f\u672c\u6587\u6240\u8981\u8bf4\u7684\uff0c\u4e00\u79cd\u517c\u5bb9Set\u7684\u65e0\u5e8f\uff0cList\u7684\u53ef\u91cd\u590d\u7684\u6570\u636e\u7ed3\u6784\uff1aMultiset\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g51o8l9mqfj20cs0rstae.jpg\" alt=\"\" \/><figcaption>\u6570\u636e\u7ed3\u6784<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u95ee\u9898\uff0c\u6709\u53ef\u80fd\u4f60\u5728\u9762\u8bd5\u4e2d\u4e5f\u4f1a\u88ab\u95ee\u5230\u3002\u56e0\u4e3a\u6570\u636e\u7ed3\u6784\uff0c\u770b\u4f3c\u6700\u67af\u71e5\uff0c\u4f46\u5b83\u5177\u6709\u6700\u957f\u4e45\u7684\u751f\u547d\u529b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Guava \u7c7b\u5e93\u4e2d\u63d0\u4f9b\u4e86\u4e00\u79cd\u517c\u5bb9 Set \u7684\u65e0\u5e8f\uff0cList \u7684\u53ef\u91cd\u590d\u7684\u6570\u636e\u7ed3\u6784 Multiset\u3002Multiset \u5e95\u5c42\u8fd8\u662f\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u5c31\u76f8\u5f53\u4e8e\u5bf9\u6211\u4eec\u4e0a\u9762\u7684\u4ee3\u7801\u8fdb\u884c\u4e86\u5c01\u88c5\u3002\u540c\u65f6\u4e5f\u7b97\u662f\u5bf9 Java \u4e2d\u6570\u636e\u7ed3\u6784\u7684\u4e00\u79cd\u6269\u5c55\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Multiset countMultiset = HashMultiset.create();\ncountMultiset.addAll(\"xttblog\u201d);\n\nint xttblogCount = countMultiset.count(\"xttblog\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4f7f\u7528 Multiset \u540e\uff0c\u6211\u4eec\u7684\u4ee3\u7801\u5c31\u53d8\u5f97\u975e\u5e38\u7684\u7b80\u5355\u4e86\u3002\u6211\u4eec\u53ea\u9700\u5b58\u653e\uff0c\u800c\u6700\u7ec8\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u91cd\u590d\u6b21\u6570\uff0c\u53ea\u9700\u8981\u901a\u8fc7 count \u65b9\u6cd5\u5c31\u53ef\u4ee5\u83b7\u5f97\uff0c\u975e\u5e38\u7684\u65b9\u4fbf\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u65f6 Multiset \u8fd8\u63d0\u4f9b\u4e86 setCount(E, int) \u65b9\u6cd5\uff0c\u53ef\u4ee5\u4fee\u6539\u5143\u7d20 E \u5728 Multiset \u4e2d\u7684\u6b21\u6570\uff0c\u4f46\u662f\u4e0d\u80fd\u628a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u4fee\u6539\u4e3a\u8d1f\u6570\u548c\u5927\u4e8e Integer.MAX_VALUE \u7684\u503c\uff0c\u5426\u5219\u5c06\u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Multiset \u4e2d\u7684\u51e0\u4e2a\u7279\u70b9\uff0c\u53ef\u4ee5\u603b\u7ed3\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Multiset \u4e2d\u7684\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\u53ea\u80fd\u4e3a\u6b63\u6570\uff0c\u524d\u9762\u8bf4\u4e86\u539f\u56e0\u3002\u5982\u679cE\u7684\u51fa\u73b0\u6b21\u6570\u4e3a 0\uff0c\u90a3\u4e48 E \u5c06\u4e0d\u51fa\u73b0\u5728 multiset\u4e2d\uff0c\u662f\u4e0d\u80fd\u5728 elementSet() \u548c entrySet() \u7684\u89c6\u56fe\u4e2d\u3002<\/li><li>multiset.size() \u8fd4\u56de\u8fd9\u4e2a\u96c6\u5408\u7684\u5927\u5c0f\uff0c\u76f8\u5f53\u4e8e\u5728 multiset \u4e2d\u5143\u7d20\u7684\u51fa\u73b0\u7684\u603b\u6570\u3002\u5982\u679c\u60f3\u5f97\u5230 multiset \u4e2d\u4e0d\u540c\u5143\u7d20\u51fa\u73b0\u7684\u603b\u6570\uff0c\u53ef\u4ee5\u5229\u7528 elementSet().size() \u6765\u5b9e\u73b0\u3002<\/li><li>multiset.iterator() \u53ef\u4ee5\u904d\u5386 Multiset \u4e2d\u7684\u6240\u6709\u5143\u7d20\uff0c\u6240\u4ee5 iteratior \u904d\u5386\u7684\u6b21\u6570\u5c31\u7b49\u4e8e multiset.size()\u3002<\/li><li>Multiset \u652f\u6301\u6dfb\u52a0\u3001\u5220\u9664\u5143\u7d20\uff0c\u8bbe\u7f6e\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff1bsetCount(elem, 0) \u76f8\u5f53\u4e8e\u79fb\u9664 elem \u7684\u6240\u6709\u5143\u7d20\u3002<\/li><li>multiset.count(elem) \u65b9\u6cd5\u4e2d\u7684 elem \u5982\u679c\u6ca1\u6709\u51fa\u73b0\u5728 Multiset \u4e2d\uff0c\u90a3\u4e48\u5b83\u7684\u8fd4\u56de\u503c\u6c38\u8fdc\u90fd\u662f 0\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Multiset \u8fd8\u6709\u975e\u5e38\u591a\u7684\u5b9e\u73b0\uff0c\u6bd4\u5982\uff1aHashMultiset\u3001LinkedHashMultiset\u3001TreeMultiset\u3001EnumMultiset\u3001ImmutableMultiset\u3002\u53ef\u4ee5\u8bf4 Guava \u7c7b\u5e93\u975e\u5e38\u7684\u5f3a\u5927\uff0c\u5e73\u65f6\u4f60\u80fd\u7528\u5230\u7684\u5f88\u591a\u5de5\u5177\u529f\u80fd\uff0c\u90fd\u80fd\u5728\u5b83\u91cc\u9762\u627e\u5230\u5b9e\u73b0\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=4417\">\u8bf7\u5b9e\u73b0\u4e00\u79cd\u517c\u5bb9Set\u7684\u65e0\u5e8f\uff0cList\u7684\u53ef\u91cd\u590d\u7684\u6570\u636e\u7ed3\u6784<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>Java \u4e2d\uff0c\u63d0\u4f9b\u4e86\u5f88\u591a\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\u3002\u6bd4\u5982\uff0cMap\u3001List\u3001Set \u7b49\u3002\u4f46\u662f\uff0c\u5728\u5f88\u591a\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7edf\u8ba1 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1164,1161,1779,1162,1163],"class_list":["post-4417","post","type-post","status-publish","format-standard","hentry","category-java","tag-concurrenthashmap","tag-hashmap","tag-hashset","tag-hashtable","tag-linkedhashmap"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4417","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4417"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4417\/revisions"}],"predecessor-version":[{"id":4418,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4417\/revisions\/4418"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}