{"id":203562,"date":"2025-05-22T10:16:50","date_gmt":"2025-05-22T02:16:50","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203562\/"},"modified":"2025-05-22T10:16:50","modified_gmt":"2025-05-22T02:16:50","slug":"java-%e6%95%b0%e6%8d%ae%e5%a4%84%e7%90%86%ef%bc%9a%e5%a6%82%e4%bd%95%e5%b0%86%e8%a1%8c%e6%95%b0%e6%8d%ae%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%88%97%e6%95%b0%e6%8d%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203562\/","title":{"rendered":"Java \u6570\u636e\u5904\u7406\uff1a\u5982\u4f55\u5c06\u884c\u6570\u636e\u8f6c\u6362\u4e3a\u5217\u6570\u636e\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java \u6570\u636e\u5904\u7406\uff1a\u5982\u4f55\u5c06\u884c\u6570\u636e\u8f6c\u6362\u4e3a\u5217\u6570\u636e\uff1f<\/h1>\n<p>\u79ef\u7d2f\u77e5\u8bc6\uff0c\u80dc\u8fc7\u79ef\u84c4\u91d1\u94f6\uff01\u6bd5\u7adf\u5728\u6587\u7ae0\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u9047\u5230\u5404\u79cd\u5404\u6837\u7684\u95ee\u9898\uff0c\u5f80\u5f80\u90fd\u662f\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u6ca1\u6709\u638c\u63e1\u597d\u800c\u5bfc\u81f4\u7684\uff0c\u56e0\u6b64\u57fa\u7840\u77e5\u8bc6\u70b9\u7684\u79ef\u7d2f\u662f\u5f88\u91cd\u8981\u7684\u3002\u4e0b\u9762\u672c\u6587\u300aJava \u6570\u636e\u5904\u7406\uff1a\u5982\u4f55\u5c06\u884c\u6570\u636e\u8f6c\u6362\u4e3a\u5217\u6570\u636e\uff1f\u300b\uff0c\u5c31\u5e26\u5927\u5bb6\u8bb2\u89e3\u4e00\u4e0b\u77e5\u8bc6\u70b9\uff0c\u82e5\u662f\u4f60\u5bf9\u672c\u6587\u611f\u5174\u8da3\uff0c\u6216\u8005\u662f\u60f3\u641e\u61c2\u5176\u4e2d\u67d0\u4e2a\u77e5\u8bc6\u70b9\uff0c\u5c31\u8bf7\u4f60\u7ee7\u7eed\u5f80\u4e0b\u770b\u5427~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241111\/1731335089673213b1b3024.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>java \u6570\u636e\u5904\u7406\uff1a\u884c\u8f6c\u5217<\/strong><\/p>\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u9700\u8981\u5c06\u6570\u636e\u4ece\u884c\u683c\u5f0f\u8f6c\u6362\u4e3a\u5217\u683c\u5f0f\u3002\u4f8b\u5982\uff0c\u7ed9\u5b9a\u4ee5\u4e0b\u6e90\u6570\u636e\uff1a<\/p>\n<pre>class    studentid    subject    score\nclass one    1    english    84\nclass one    1    math    77\nclass one    1    pe    69\nclass one    2    english    81\nclass one    2    math    80<\/pre>\n<p>\u6211\u4eec\u5e0c\u671b\u8f93\u51fa\u4ee5\u4e0b\u5217\u683c\u5f0f\u7684\u6570\u636e\uff1a<\/p>\n<pre>class    studentid    english    math    pe\nclass one    1    84    77    69<\/pre>\n<p>java \u4e2d\u5982\u4f55\u5b9e\u73b0\u6b64\u884c\u8f6c\u5217\u64cd\u4f5c\uff1f<\/p>\n<p><strong>\u7b54\u6848\uff1a<\/strong><\/p>\n<p>\u4e00\u884c\u4ee3\u7801\u641e\u5b9a\uff1a<\/p>\n<pre>Map&lt;String, Map&lt;String, Integer&gt;&gt; map = df.groupBy(\"CLASS\", \"STUDENTID\").pivot(\"SUBJECT\").agg(max(\"SCORE\"));<\/pre>\n<p>\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aJava \u6570\u636e\u5904\u7406\uff1a\u5982\u4f55\u5c06\u884c\u6570\u636e\u8f6c\u6362\u4e3a\u5217\u6570\u636e\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u6570\u636e\u5904\u7406\uff1a\u5982\u4f55\u5c06\u884c\u6570\u636e&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203562","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203562","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203562"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203562\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}