{"id":540,"date":"2020-12-29T15:18:07","date_gmt":"2020-12-29T07:18:07","guid":{"rendered":"http:\/\/blog.refusea.com\/?p=540"},"modified":"2020-12-29T15:18:07","modified_gmt":"2020-12-29T07:18:07","slug":"java-%e7%a7%bb%e4%bd%8d%e8%bf%90%e7%ae%97","status":"publish","type":"post","link":"https:\/\/refusea.com\/?p=540","title":{"rendered":"Java \u79fb\u4f4d\u8fd0\u7b97"},"content":{"rendered":"<h2>\u80cc\u666f<\/h2>\n<p>\u6700\u8fd1\u4fee\u590d\u4e86\u4e00\u4e2a\u79fb\u4f4d\u8fd0\u7b97\u76f8\u5173\u7684 bug\uff0c\u8bb0\u5f55\u4e00\u4e0b\u5fc3\u5f97<\/p>\n<p><strong>bug \u4ecb\u7ecd<\/strong><br \/>\n\u8bdd\u8bf4\u6709\u5982\u4e0b\u7684\u4e1a\u52a1\u89c4\u5219<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/static.refusea.com\/2020\/12\/bidfloor.png\" alt=\"\" \/><\/p>\n<p>\u8fd9\u4e2a\u8868\u683c\u5b9a\u4e49\u4e86\u4e0d\u540c\u8d44\u6e90\u5305\u5728\u4e0d\u540c\u7ade\u4ef7\u7c7b\u578b\u4e0b\u7684\u5e95\u4ef7\uff0c\u5b9e\u65f6\u7ade\u4ef7\u65f6\u4f1a\u8fc7\u6ee4\u6389\u51fa\u4ef7\u4f4e\u4e8e\u5e95\u4ef7\u7684\u5e7f\u544a<\/p>\n<p>\u8fd9\u4e2a\u5e95\u4ef7\u5f88\u5c11\u4fee\u6539\uff0c\u7a0b\u5e8f\u4f1a\u628a\u5e95\u4ef7\u5168\u90e8\u52a0\u8f7d\u5230\u5185\u5b58\u91cc\u5e76\u5b9a\u65f6\u5237\u65b0\uff0c\u5f88\u663e\u7136\u7528\u4e00\u4e2a map \u5c31\u884c\u4e86\uff0c\u5173\u952e\u662f map \u7684 key \u8be5\u5982\u4f55\u8bbe\u8ba1\uff1f\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6848<\/p>\n<ul>\n<li>\u5d4c\u5957\u7684 Map\uff0c\u8d44\u6e90\u5305 id \u662f\u7b2c\u4e00\u5c42 map \u7684 key\uff0c\u7ade\u4ef7\u7c7b\u578b\u662f\u7b2c\u4e8c\u5c42 map \u7684 key\uff0c\u4f18\u5316\u7c7b\u578b\u662f\u7b2c\u4e09\u5c42 map \u7684 key\uff0c\u5373\n<pre><code class=\"language-java\">Map&lt;Integer, Map&lt;Integer, Map&lt;Integer, Float&gt;&gt;&gt;<\/code><\/pre>\n<\/li>\n<li>\u7528 \u8d44\u6e90\u5305 id\uff0c\u7ade\u4ef7\u7c7b\u578b\uff0c\u4f18\u5316\u7c7b\u578b\u6784\u9020\u4e00\u4e2a\u552f\u4e00\u7684 key\n<ul>\n<li>\u5b57\u7b26\u4e32 key\n<pre><code class=\"language-java\">String key = \u8d44\u6e90\u5305 id + &#039;_&#039; + \u7ade\u4ef7\u7c7b\u578b + &#039;_&#039; + \u4f18\u5316\u7c7b\u578b;<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u8003\u8651\u5230\u7ade\u4ef7\u7c7b\u578b\u548c\u4f18\u5316\u7c7b\u578b\u53d6\u503c\u90fd\u4e0d\u8d85\u8fc7 10\uff0c\u4e5f\u53ef\u4ee5\u6784\u9020\u4e00\u4e2a\u6570\u5b57 key\n<pre><code class=\"language-java\">int key = \u8d44\u6e90\u5305 id * 100 + \u7ade\u4ef7\u7c7b\u578b * 10 + \u4f18\u5316\u7c7b\u578b;<\/code><\/pre>\n<\/li>\n<li>\u8003\u8651\u5230\u79fb\u4f4d\u8fd0\u7b97\u7684\u6548\u7387\u9ad8\uff0c\u53ef\u4ee5\u901a\u8fc7\u79fb\u4f4d\u6765\u6784\u9020\u4e00\u4e2a\u6570\u5b57 key\uff0c\u5373\n<pre><code class=\"language-java\">int key = \u8d44\u6e90\u5305 id &lt;&lt; 8 | \u7ade\u4ef7\u7c7b\u578b &lt;&lt; 4 | \u4f18\u5316\u7c7b\u578b;<\/code><\/pre>\n<\/li>\n<\/ul>\n<p>\u4f5c\u4e3a\u4e00\u4e2a\u9ad8\u5ea6\u5173\u6ce8\u6027\u80fd\u7684\u5f00\u53d1\u4eba\u5458\uff0c\u9009\u62e9\u4e86\u901a\u8fc7\u79fb\u4f4d\u7684\u65b9\u5f0f\u6765\u6784\u9020 key \u81ea\u7136\u662f\u5f88\u5408\u7406\u7684\uff0c\u4e8b\u5b9e\u4e0a\u7a0b\u5e8f\u4e5f\u4e00\u76f4\u8fd0\u884c\u7684\u5f88 ok\u2014\u2014\u76f4\u5230\u6211\u6700\u8fd1\u628a\u8fd9\u4e2a key \u7684\u751f\u6210\u65b9\u5f0f\u4f18\u5316\u6210\u4e0b\u9762\u7684\u6837\u5b50<\/p>\n<pre><code class=\"language-java\">Long key = new Long(\u8d44\u6e90\u5305 id &lt;&lt; 32 | (\u7ade\u4ef7\u7c7b\u578b &lt;&lt; 16) | \u4f18\u5316\u7c7b\u578b);<\/code><\/pre>\n<p>\u65b0\u7248\u672c\u53d1\u5e03\u4e0a\u7ebf\u540e\uff0c\u8fd0\u8425\u540c\u5b66\u5f88\u5feb\u5c31\u53d1\u73b0\u8d44\u6e90\u5305 id \u4e3a 4 \u7684\u5e7f\u544a\u7684\u70b9\u51fb\/\u4e0b\u8f7d\u6570\u636e\u660e\u663e\u4e0b\u964d\uff0c\u7ecf\u8fc7\u597d\u4e00\u756a\u8c03\u8bd5\u540e\uff0c\u627e\u5230\u4e86\u95ee\u9898\uff1a\u539f\u672c\u8d44\u6e90\u5305 id = 4 \u65f6\uff0c\u5e95\u4ef7\u4e3a 1\uff0c\u7ed3\u679c\u7a0b\u5e8f\u4ece map \u91cc\u67e5\u5230\u7684\u5e95\u4ef7\u662f 2.5\uff0c\u5bfc\u81f4\u51fa\u4ef7\u4f4e\u4e8e 2.5 \u7684\u5e7f\u544a\u88ab\u8fc7\u6ee4\uff0c\u800c\u8fd9\u4e9b\u51fa\u4ef7\u8f83\u4f4e\u7684\u5e7f\u544a\u70b9\u51fb\/\u4e0b\u8f7d\u8f6c\u5316\u7387\u66f4\u9ad8\u2014\u2014\u4ece\u8fd0\u8425\u62a5\u8868\u6765\u770b\u5c31\u662f\u70b9\u51fb\u4e0b\u8f7d\u6570\u636e\u4e0b\u964d\u4e86\uff0c\u800c\u6536\u5165\u7684\u4e0b\u964d\u6ca1\u6709\u90a3\u4e48\u660e\u663e<\/p>\n<h2>\u5206\u6790<\/h2>\n<p>\u9996\u5148\u8fd8\u662f\u8981\u53cd\u601d\u4e0b\uff0c\u8fd0\u884c\u7684\u597d\u597d\u7684\u4ee3\u7801\u4e3a\u4ec0\u4e48\u8981\u4f18\u5316\u5462\uff1f<\/p>\n<pre><code class=\"language-java\">int key = \u8d44\u6e90\u5305 id &lt;&lt; 8 | \u7ade\u4ef7\u7c7b\u578b &lt;&lt; 4 | \u4f18\u5316\u7c7b\u578b<\/code><\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u8fd0\u884c ok \u6709\u4e2a\u524d\u63d0\uff1a\u7ade\u4ef7\u7c7b\u578b\u548c\u4f18\u5316\u7c7b\u578b\u90fd\u4e0d\u80fd\u5927\u4e8e 15\uff0c\u4ece\u5f53\u524d\u4e1a\u52a1\u4e0a\u6765\u8bf4\u8fd9\u662f\u5b8c\u5168 ok \u7684\uff0c\u53ef\u662f\u4e07\u4e00\u54ea\u5929\u4e1a\u52a1\u9700\u6c42\u53d1\u751f\u53d8\u66f4\uff0c\u9700\u8981\u5b9a\u4e49\u66f4\u591a\u7684\u7ade\u4ef7\u7c7b\u578b\u548c\u4f18\u5316\u7c7b\u578b\uff0c\u90a3\u5c31\u662f\u4e2a\u9690\u60a3\u554a<\/p>\n<p>\u6240\u4ee5\u5f53\u6211\u67d0\u5929\u65e0\u804a\u7684 review \u5230\u8fd9\u6bb5\u4ee3\u7801\u65f6\uff0c\u6ca1\u6709\u8fc7\u591a\u601d\u8003\uff0c\u5c31\u51b3\u5b9a\u4e3a\u7ade\u4ef7\u7c7b\u578b\u548c\u4f18\u5316\u7c7b\u578b\u7684\u53d6\u503c\u8303\u56f4\u8fdb\u884c\u6269\u5bb9\uff0c\u7136\u540e\u5199\u4e0b\u4e86\u4f18\u5316<\/p>\n<pre><code class=\"language-java\">Long key = new Long(\u8d44\u6e90\u5305 id &lt;&lt; 32 | (\u7ade\u4ef7\u7c7b\u578b &lt;&lt; 16) | \u4f18\u5316\u7c7b\u578b);<\/code><\/pre>\n<p>\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u770b\u4e0b\u8fd9\u6bb5\u4ee3\u7801\u7684\u95ee\u9898\uff0c\u5982\u4e0b<\/p>\n<pre><code class=\"language-java\">public static void main(String[] args) {\n    System.out.println(new Long(4 &lt;&lt; 32 | (2 &lt;&lt; 16) | 2));\n    System.out.println(new Long(6 &lt;&lt; 32 | (2 &lt;&lt; 16) | 2));\n}\n\n131078\n131078<\/code><\/pre>\n<p>\u54ce\u5440\uff0c\u6211\u4e86\u4e2a x\uff0c\u600e\u4e48\u8d44\u6e90\u5305 4 \u7684 key \u548c\u8d44\u6e90\u5305 6 \u7684 key \u4e00\u6837\u5462\uff1f<\/p>\n<p>\u7ecf\u8fc7\u4e00\u756a\u7814\u7a76\uff0c\u53d1\u73b0\u95ee\u9898\u51fa\u5728 <code>\u8d44\u6e90\u5305 id &lt;&lt; 32<\/code> \u8fd9\u6bb5\u4ee3\u7801\u4e0a\uff0c\u800c\u771f\u6b63\u7684\u5173\u952e\u662f \u8d44\u6e90\u5305 id \u662f\u4e2a int \u7c7b\u578b<\/p>\n<p>int \u7c7b\u578b\u79fb\u4f4d\u4ee5\u540e\u8fd8\u662f\u4e2a int\uff0c\u4e0d\u53ef\u80fd\u53d8\u6210 long\uff0c\u90a3\u4e48\u5bf9\u5b83\u8fdb\u884c <code>&lt;&lt; 32<\/code> \u5b9e\u9645\u4e0a\u5e94\u8be5\u6ea2\u51fa\u624d\u5bf9<\/p>\n<p>\u4e0d\u8fc7 java \u4e0d\u77e5\u51fa\u4e8e\u4f55\u79cd\u8003\u8651\uff0c\u6ca1\u6709\u4ea7\u751f\u6ea2\u51fa\uff1a\u5b83\u5f88\u9e21\u8d3c\u7684\u6ca1\u6709\u505a\u4efb\u4f55\u79fb\u4f4d\u64cd\u4f5c\uff0c\u6216\u8005\u8bf4\u5f53\u79fb\u4f4d\u6570\u8d85\u8fc7\u4e86 int \u5b9e\u9645\u5360\u636e\u7684\u6570\u91cf\u4ee5\u540e\uff0cjava \u4f1a\u5c06\u79fb\u4f4d\u6570\u9664\u4ee5 32\uff0c\u7136\u540e\u5b9e\u9645\u79fb\u4f4d\u7684\u662f\u8be5\u9664\u6cd5\u7684\u4f59\u6570\u2014\u2014\u8fd9\u6837\u5c31\u4e0d\u7528\u62c5\u5fc3\u4f1a\u6ea2\u51fa\u4e86<\/p>\n<h2>\u5fc3\u5f97<\/h2>\n<p>\u8fd0\u7b97\u7ed3\u679c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u662f\u8fd0\u7b97\u7b26\u5de6\u4fa7\u6570\u636e\u7684\u6570\u636e\u7c7b\u578b\uff0c\u6240\u4ee5\u5bf9 int \u65e0\u8bba\u600e\u4e48\u79fb\u4f4d\u7ed3\u679c\u8fd8\u662f int<br \/>\njava \u865a\u62df\u673a\u5bf9 int \u79fb\u4f4d\u8fd0\u7b97\u8fdb\u884c\u4e86\u7279\u6b8a\u5904\u7406\u6765\u907f\u514d\u53d1\u751f\u6ea2\u51fa<\/p>\n<p>\u672c\u6b21 bug \u7684\u4fee\u590d\u662f\u56de\u9000\u5230\u4e86\u6700\u521d\u7684\u7248\u672c\uff0c\u5b9e\u9645\u4e0a\u5c06\u8d44\u6e90\u5305 id \u9020\u578b\u6210 long \u4e5f\u662f ok \u7684\uff0c\u5373<\/p>\n<pre><code class=\"language-java\">Long key = new Long(((long)\u8d44\u6e90\u5305 id) &lt;&lt; 32 | (\u7ade\u4ef7\u7c7b\u578b &lt;&lt; 16) | \u4f18\u5316\u7c7b\u578b);<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u80cc\u666f \u6700\u8fd1\u4fee\u590d\u4e86\u4e00\u4e2a\u79fb\u4f4d\u8fd0\u7b97\u76f8\u5173\u7684 bug\uff0c\u8bb0\u5f55\u4e00\u4e0b\u5fc3\u5f97 bug \u4ecb\u7ecd \u8bdd\u8bf4\u6709\u5982\u4e0b\u7684\u4e1a\u52a1\u89c4\u5219 \u8fd9\u4e2a\u8868\u683c\u5b9a\u4e49\u4e86\u4e0d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[54],"class_list":["post-540","post","type-post","status-publish","format-standard","hentry","category-java","tag-54"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java \u79fb\u4f4d\u8fd0\u7b97 - \u62d2\u6d77\u7a7a\u95f4<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/refusea.com\/?p=540\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"refusea.com\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/refusea.com\/?p=540#article\",\"isPartOf\":{\"@id\":\"https:\/\/refusea.com\/?p=540\"},\"author\":{\"name\":\"refusea.com\",\"@id\":\"https:\/\/refusea.com\/#\/schema\/person\/b5393cc8b15717000d19424552aae0df\"},\"headline\":\"Java 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