{"id":31706,"date":"2023-05-24T23:35:28","date_gmt":"2024-02-27T22:38:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-map%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-30T05:50:41","modified_gmt":"2024-04-29T21:50:41","slug":"java-map%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-map%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java Map\u7684\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u5728\u5b66\u4e60\u300a\u7b80\u6d01\u6613\u61c2\u7684Servlet\uff06JSP\u5165\u95e8\u300b\u65f6\uff0c\u6211\u4e0d\u7ecf\u610f\u5730\u4f7f\u7528\u7684HashMap\uff0c\u4ee5\u4e3a\u81ea\u5df1\u5df2\u7ecf\u7406\u89e3\u4e86\u5b83\uff0c\u6240\u4ee5\u6211\u603b\u7ed3\u4e86\u4e00\u4e0b\u3002<\/p>\n<h2>\u5730\u56fe\u7684\u4f7f\u7528\u65b9\u6cd5<\/h2>\n<p>\u5730\u56fe\uff08Map\uff09\u662f\u4ee5\u952e\uff08key\uff09\u548c\u503c\uff08value\uff09\u4f5c\u4e3a\u4e00\u5bf9\u7684\u5f62\u5f0f\u5b58\u50a8\u4e24\u79cd\u4fe1\u606f\u7684\u3002<\/p>\n<p>\u628a\u952e\u548c\u6570\u636e\u7684\u7ec4\u5408\u79f0\u4e3a\u6761\u76ee\u3002<\/p>\n<ul class=\"post-ul\">HashMap\u30af\u30e9\u30b9\u306e\u5229\u7528<\/ul>\n<pre class=\"post-pre\"><code>\r\n<span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">\u30ad\u30fc\u306e\u578b<\/span><span class=\"o\">,<\/span> <span class=\"n\">\u5024\u306e\u578b<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">\u30de\u30c3\u30d7\u5909\u6570<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">HashMap<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">\u30ad\u30fc\u306e\u578b<\/span><span class=\"o\">,<\/span> <span class=\"n\">\u5024\u306e\u578b<\/span><span class=\"o\">&gt;();<\/span> <span class=\"c1\">\/\/\u7dcf\u79f0\u578b\u306e\u5229\u7528\uff08JDK1.5\uff09<\/span>\r\n\r\n<span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">\u30ad\u30fc\u306e\u578b<\/span><span class=\"o\">,<\/span> <span class=\"n\">\u5024\u306e\u578b<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">\u30de\u30c3\u30d7\u5909\u6570<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">HashMap<\/span><span class=\"o\">&lt;&gt;();<\/span> <span class=\"c1\">\/\/\u578b\u5f15\u6570\u3092\u7701\u7565\uff08JDK1.7\uff09<\/span>\r\n\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ad\u30fc\u3068\u5024\u306e\u30c7\u30fc\u30bf\u578b\u3092\u6307\u5b9a\u3059\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u203bint\u578b\u306e\u5834\u5408\u306fInteger\u3068\u3059\u308b\u3002<\/ul>\n<p>\u5728HashMap\u4e2d\u6709\u4ee5\u4e0b\u7684\u65b9\u6cd5\u3002<\/p>\n<div>\n<div class=\"post-table\">\u623b\u308a\u5024\u3000\u30e1\u30bd\u30c3\u30c9\u3000\u3000\u3000\u610f\u5473<br \/>\nput(\u25cf, \u25b2)\u30de\u30c3\u30d7\u306b\u25cf\u3068\u25b2\u306e\u30da\u30a2\u3092\u683c\u7d0d<br \/>\nget(\u25cf)\u30ad\u30fc\u306e\u5024\u306b\u5bfe\u5fdc\u3059\u308b\u5024\u3092\u53d6\u5f97intsize()\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30da\u30a2\u6570\u3092\u6570\u3048\u308b<br \/>\nremove(\u25cf)\u6307\u5b9a\u3057\u305f\u5185\u5bb9\u306e\u8981\u7d20\u3092\u524a\u9664Set&lt;\u25cf&gt;keySet()\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30ad\u30fc\u306e\u4e00\u89a7\u3092\u8fd4\u3059<\/div>\n<\/div>\n<p>\u7531\u4e8e\u8fd8\u6709\u5f88\u591a\u5185\u5bb9\uff0c\u6240\u4ee5\u8bf7\u53c2\u8003\u6b64\u94fe\u63a5&#8230;<\/p>\n<p>\u6ce8\u610f\u4e8b\u9879\uff1a\u5728Map\u4e2d\uff0c\u503c\u7684\u91cd\u590d\u662f\u88ab\u5141\u8bb8\u7684\uff0c\u4f46\u662f\u952e\u7684\u91cd\u590d\u662f\u4e0d\u88ab\u5141\u8bb8\u7684\u3002<\/p>\n<h2>\u793a\u4f8b\u4ee3\u7801<\/h2>\n<pre class=\"post-pre\"><code>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.*<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">Exception<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">prefs<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">HashMap<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">&gt;();<\/span>\r\n        <span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u4eac\u90fd\u5e9c\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">255<\/span><span class=\"o\">);<\/span>  <span class=\"c1\">\/\/\u8981\u7d20\u3092\u683c\u7d0d<\/span>\r\n        <span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u6771\u4eac\u90fd\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">1261<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u718a\u672c\u770c\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">181<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u4eac\u90fd\u5e9c\"<\/span><span class=\"o\">));<\/span>  <span class=\"c1\">\/\/\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3059<\/span>\r\n\r\n        <span class=\"kt\">int<\/span> <span class=\"nc\">Tokyo<\/span> <span class=\"o\">=<\/span> <span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u6771\u4eac\u90fd\"<\/span><span class=\"o\">);<\/span>  <span class=\"c1\">\/\/\u30ad\u30fc\u3092\u6307\u5b9a\u3057\u3001\u8981\u7d20\u3092\u53d6\u308a\u51fa\u3057\u4ee3\u5165<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"nc\">Tokyo<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u6771\u4eac\u90fd\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">1500<\/span><span class=\"o\">);<\/span>  <span class=\"c1\">\/\/\u89e3\u8aac\u2460<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u6771\u4eac\u90fd\"<\/span><span class=\"o\">));<\/span>\r\n\r\n        <span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">remove<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u718a\u672c\u770c\"<\/span><span class=\"o\">);<\/span>  <span class=\"c1\">\/\/\u8981\u7d20\u3092\u524a\u9664\u3000\u3000<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">prefs<\/span><span class=\"o\">.<\/span><span class=\"na\">size<\/span><span class=\"o\">());<\/span>  <span class=\"c1\">\/\/\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30da\u30a2\u6570\u3092\u53d6\u5f97<\/span>\r\n\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>\r\n<span class=\"mi\">255<\/span>\r\n<span class=\"mi\">1261<\/span>\r\n<span class=\"mi\">1500<\/span>\r\n<span class=\"mi\">2<\/span>\r\n<\/code><\/pre>\n<p>\u5f53\u4f7f\u7528\u76f8\u540c\u7684\u952e\u6765\u6dfb\u52a0\u4e0d\u540c\u7684\u503c\u5230put()\u51fd\u6570\u4e2d\u65f6\uff0c\u503c\u4f1a\u88ab\u8986\u76d6\u3002<\/p>\n<h2>\u6700\u540e<\/h2>\n<p>\u5f53\u4f60\u4ee5\u4e3a\u81ea\u5df1\u7406\u89e3\u4e86\uff0c\u7ed3\u679c\u5374\u5403\u4e86\u82e6\u5934\u5462\uff0c\u54c8\u54c8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u5728\u5b66\u4e60\u300a\u7b80\u6d01\u6613\u61c2\u7684Servlet\uff06JSP\u5165\u95e8\u300b\u65f6\uff0c\u6211\u4e0d\u7ecf\u610f\u5730\u4f7f\u7528\u7684HashMap\uff0c\u4ee5\u4e3a\u81ea\u5df1\u5df2\u7ecf\u7406\u89e3\u4e86\u5b83\uff0c [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31706","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java Map\u7684\u4f7f\u7528\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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