{"id":203,"date":"2023-07-27T19:59:51","date_gmt":"2023-11-13T23:31:20","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8java%e4%b8%ad%e5%a6%82%e4%bd%95%e6%a0%b9%e6%8d%ae%e5%80%bc%e5%af%b9hashmap%e8%bf%9b%e8%a1%8c%e6%8e%92%e5%ba%8f%ef%bc%9f\/"},"modified":"2025-08-01T02:20:08","modified_gmt":"2025-07-31T18:20:08","slug":"%e5%9c%a8java%e4%b8%ad%e5%a6%82%e4%bd%95%e6%a0%b9%e6%8d%ae%e5%80%bc%e5%af%b9hashmap%e8%bf%9b%e8%a1%8c%e6%8e%92%e5%ba%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e5%a6%82%e4%bd%95%e6%a0%b9%e6%8d%ae%e5%80%bc%e5%af%b9hashmap%e8%bf%9b%e8%a1%8c%e6%8e%92%e5%ba%8f%ef%bc%9f\/","title":{"rendered":"Java HashMap\u6309\u503c\u6392\u5e8f\uff1a\u7ec8\u6781\u6307\u5357\u4e0e\u5b9e\u7528\u6280\u5de7"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5728Java\u4e2d\u5982\u4f55\u6839\u636e\u503c\u5bf9HashMap\u8fdb\u884c\u6392\u5e8f\uff1f\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51714\u90e8\u5206\uff09\u3002<\/p>\n<p>Java\u4e2d\u7684<code>HashMap<\/code>\u63d0\u4f9b\u4e86\u5feb\u901f\u67e5\u627e\u529f\u80fd\uff0c\u5b83\u4eec\u4ee5\u201c\u952e\u503c\u5bf9\u201d\uff08key-value pairs\uff09\u7684\u5f62\u5f0f\u5b58\u50a8\u6570\u636e\u9879\u3002\u8981\u4ece<code>HashMap<\/code>\u4e2d\u83b7\u53d6\u4e00\u4e2a\u503c\uff0c\u6211\u4eec\u4f7f\u7528\u4e0e\u8be5\u6761\u76ee\u5bf9\u5e94\u7684\u952e\u3002<\/p>\n<p><code>HashMap<\/code>\u662f\u5b9e\u73b0\u5b57\u5178\u548c\u76ee\u5f55\u7684\u4f18\u79c0\u9009\u62e9\u3002<\/p>\n<p>\u952e\u548c\u503c\u53ef\u4ee5\u662f\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\uff08\u4f8b\u5982\uff0c\u5b57\u7b26\u4e32\u3001\u6574\u6570\uff09\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u952e\u548c\u503c\u5bf9<code>HashMap<\/code>\u4e2d\u7684\u6761\u76ee\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u91cd\u70b9\u4ecb\u7ecd\u5982\u4f55\u6839\u636e\u503c\u5bf9<code>HashMap<\/code>\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<p>\u57fa\u672c\u7b56\u7565\u662f\uff1a\u9996\u5148\u4ece<code>HashMap<\/code>\u4e2d\u63d0\u53d6\u6240\u6709\u503c\uff0c\u5e76\u5c06\u5b83\u4eec\u653e\u5165\u4e00\u4e2a\u5217\u8868\u4e2d\u8fdb\u884c\u6392\u5e8f\u3002\u5982\u679c\u503c\u7684\u6570\u636e\u7c7b\u578b\u662f<code>String<\/code>\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u6bd4\u8f83\u5668\uff08Comparator\uff09\u5bf9\u5217\u8868\u8fdb\u884c\u6392\u5e8f\u3002\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u6bd4\u8f83\u5668\u7684\u4fe1\u606f\uff0c\u8bf7\u9605\u8bfb<a href=\"#\" target=\"_blank\">\u672c\u6559\u7a0b<\/a>\u3002<\/p>\n<p>\u4e00\u65e6\u6211\u4eec\u83b7\u5f97\u4e86\u6309\u987a\u5e8f\u6392\u5217\u7684\u503c\u5217\u8868\uff0c\u6211\u4eec\u5c06\u6839\u636e\u8fd9\u4e2a\u6392\u5e8f\u540e\u7684\u5217\u8868\u91cd\u65b0\u6784\u5efa<code>HashMap<\/code>\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4ee3\u7801\u5b9e\u73b0\u3002<\/p>\n<h2>HashMap\u6309\u503c\u6392\u5e8f\u7684\u7b80\u5355\u793a\u4f8b<\/h2>\n<p>\u6211\u4eec\u9996\u5148\u5c06\u5b57\u7b26\u4e32\u503c\u653e\u5165\u4e00\u4e2a\u5217\u8868\u4e2d\uff0c\u7136\u540e\u5bf9\u8be5\u5217\u8868\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<p>\u4e3a\u4e86\u5bf9\u5217\u8868\u4e2d\u7684\u5b57\u7b26\u4e32\u503c\u8fdb\u884c\u6392\u5e8f\uff0c\u6211\u4eec\u4f7f\u7528\u4e00\u4e2a\u6bd4\u8f83\u5668\uff08Comparator\uff09\u3002\u8fd9\u4e2a\u6bd4\u8f83\u5668\u5c06\u6309\u5b57\u6bcd\u987a\u5e8f\u5bf9\u503c\u5217\u8868\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Comparator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> str1<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span>str1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u6211\u4eec\u6392\u5e8f\u5b8c\u5217\u8868\u4e4b\u540e\uff0c\u6211\u4eec\u6839\u636e\u8fd9\u4e2a\u6392\u5e8f\u597d\u7684\u5217\u8868\u6784\u5efa<code>HashMap<\/code>\u3002<\/p>\n<p>\u5b8c\u6574\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>collections<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collections<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Comparator<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">HashMap<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">LinkedHashMap<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">.<\/span><span class=\"token class-name\">Entry<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Main<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> map <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">LinkedHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sortedMap <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LinkedHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"2\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"B\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"8\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"A\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"4\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"D\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"7\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"F\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"6\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"W\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"19\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"J\"<\/span><span class=\"token punctuation\">);<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"1\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Z\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Comparator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> str1<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span>str1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str <span class=\"token operator\">:<\/span> list<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                    sortedMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n                <span class=\"token punctuation\">}<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>sortedMap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-text\">{8=A, 5=B, 3=D, 7=F, 10=J, 2=W, 1=Z}\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647613a4b2f92e6c72a6e8\/17-0.png\" alt=\"\u503c\u7c7b\u578b\u4e3a\u5b57\u7b26\u4e32\" \/><\/div>\n<p>HashMap\u7684\u6761\u76ee\u6839\u636e\u5176\u503c\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<h2>\u6839\u636e\u503c\u5bf9HashMap\u8fdb\u884c\u6392\u5e8f\u7684\u53e6\u4e00\u4e2a\u793a\u4f8b\uff1a\u5f53HashMap\u7684\u503c\u4e3a\u6574\u578b(Integer)\u65f6<\/h2>\n<p>\u5982\u679cHashMap\u4e2d\u7684\u503c\u662f\u6574\u578b(Integer)\uff0c\u4ee3\u7801\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">JournalDev<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collections<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Comparator<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">HashMap<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">LinkedHashMap<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">.<\/span><span class=\"token class-name\">Entry<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Main<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> map <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">LinkedHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sortedMap <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LinkedHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"A\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"B\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"C\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"D\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"E\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"F\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        map<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"G\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> \r\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> num <span class=\"token operator\">:<\/span> list<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Entry<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> entry <span class=\"token operator\">:<\/span> map<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                    sortedMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>entry<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n                <span class=\"token punctuation\">}<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>sortedMap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u8f93\u51fa\uff1a<\/h3>\n<pre class=\"post-pre\"><code class=\"language-text\">{D=1, E=2, C=3, G=4, A=5, B=7, F=8}\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647613a4b2f92e6c72a6e8\/24-0.png\" alt=\"\u503c\u4e3a\u6574\u578b\" \/><\/div>\n<h2>\u4f7f\u7528\u81ea\u5b9a\u4e49\u6bd4\u8f83\u5668\u5bf9HashMap\u8fdb\u884c\u6392\u5e8f<\/h2>\n<p>\u5728\u524d\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u770b\u5230<code>Value<\/code>\u5bf9\u8c61\u5b9e\u73b0\u4e86<code>Comparator<\/code>\u63a5\u53e3\uff0c\u5e76\u6839\u636e\u6574\u6570\u503c\u5bf9<code>HashMap<\/code>\u8fdb\u884c\u4e86\u6392\u5e8f\u3002\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u503c\u662f\u81ea\u5b9a\u4e49\u5bf9\u8c61\u7684\u4f8b\u5b50\u3002<\/p>\n<p>\u6211\u4eec\u8fd8\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u6bd4\u8f83\u5668\u6765\u6839\u636e\u503c\u5bf9\u54c8\u5e0c\u6620\u5c04\u8fdb\u884c\u6392\u5e8f\u3002\u5f53\u503c\u662f\u81ea\u5b9a\u4e49\u5bf9\u8c61\u65f6\uff0c\u8fd9\u79cd\u65b9\u6cd5\u5c06\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u503c\u662f\u4e00\u4e2a\u540d\u4e3a\u201cName\u201d\u7684\u7c7b\u3002\u8fd9\u4e2a\u7c7b\u6709\u4e24\u4e2a\u53c2\u6570\uff1a\u540d\u5b57\uff08firstName\uff09\u548c\u59d3\u6c0f\uff08lastName\uff09\u3002<\/p>\n<p><code>Name<\/code>\u7c7b\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>JournalDev<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Name<\/span> <span class=\"token punctuation\">{\r\n<\/span>   <span class=\"token class-name\">String<\/span> firstName<span class=\"token punctuation\">;\r\n<\/span>   <span class=\"token class-name\">String<\/span> lastName<span class=\"token punctuation\">;\r\n<\/span>   <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token class=\"token class-name\">String<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{\r\n<\/span>       firstName<span class=\"token operator\">=<\/span>a<span class=\"token punctuation\">;\r\n<\/span>       lastName<span class=\"token operator\">=<\/span>b<span class=\"token punctuation\">;\r\n\r\n<\/span>   <span class=\"token punctuation\">}\r\n<\/span>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getFirstName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n<\/span>        <span class=\"token keyword\">return<\/span> firstName<span class=\"token punctuation\">;\r\n<\/span>    <span class=\"token punctuation\">}\r\n\r\n\r\n<\/span><span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<p>\u81ea\u5b9a\u4e49\u7684\u6bd4\u8f83\u5668\u5c06\u7c7b\u4f3c\u4e8e\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token class-name\">Comparator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> byName <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Name<\/span> obj1<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Name<\/span> obj2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> obj1<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFirstName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span>obj2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFirstName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<p>\u6211\u4eec\u6b63\u5728\u6309\u7167\u540d\u5b57\uff08firstName\uff09\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u4f7f\u7528\u59d3\u6c0f\uff08lastName\uff09\u6765\u6392\u5e8f\u3002\u4e3a\u4e86\u907f\u514d\u5148\u5c06\u503c\u653e\u5165\u5217\u8868\u4e2d\u518d\u8fdb\u884c\u6392\u5e8f\uff0c\u6211\u4eec\u5c06\u76f4\u63a5\u4f7f\u7528<code>LinkedHashMap<\/code>\u6765\u521b\u5efa\u5df2\u6392\u5e8f\u7684\u54c8\u5e0c\u6620\u5c04\u3002<\/p>\n<p>\u5b8c\u6574\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n<\/span>        <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> hmap <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        <span class=\"token class-name\">Name<\/span> name1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Jayant\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Verma\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        <span class=\"token class-name\">Name<\/span> name2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Ajay\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Gupta\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        <span class=\"token class-name\">Name<\/span> name3 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Mohan\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Sharma\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        <span class=\"token class-name\">Name<\/span> name4 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Rahul\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"Dev\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n\r\n\r\n<\/span>        hmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> name1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        hmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> name2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        hmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> name3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        hmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">55<\/span><span class=\"token punctuation\">,<\/span> name4<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n\r\n<\/span>        <span class=\"token class-name\">Comparator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> byName <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Name<\/span> obj1<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Name<\/span> obj2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> obj1<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFirstName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span>obj2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFirstName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n\r\n<\/span>        <span class=\"token class-name\">LinkedHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sortedMap <span class=\"token operator\">=<\/span> hmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)\r\n<\/span>                <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token punctuation\">.<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Name<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token function\">comparingByValue<\/span><span class=\"token punctuation\">(<\/span>byName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)\r\n<\/span>                <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>e1<span class=\"token punctuation\">,<\/span> e2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> e1<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">LinkedHashMap<\/span><span class=\"token operator\">::<\/span><span class=\"token keyword\">new<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        \r\n<span class=\"token comment\">\/\/ \u6253\u5370\u6392\u5e8f\u540e\u7684\u54c8\u5e0c\u6620\u5c04 <\/span>\r\n        <span class=\"token class-name\">Set<\/span> set <span class=\"token operator\">=<\/span> sortedMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">entrySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        <span class=\"token class-name\">Iterator<\/span> iterator <span class=\"token operator\">=<\/span> set<span class=\"token punctuation\">.<\/span><span class=\"token function\">iterator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>iterator<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n<\/span>            <span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span> me2 <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<span class=\"token punctuation\">.<\/span>Entry<\/span><span class=\"token punctuation\">)<\/span> iterator<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>me2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">+<\/span> <span class=\"token string\">\": \"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>         <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>hmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>me2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>firstName <span class=\"token operator\">+<\/span> <span class=\"token string\">\" \"<\/span><span class=\"token operator\">+<\/span>hmap<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>me2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getKey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>lastName <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<\/span>          \r\n        <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-text\">1: Ajay Gupta\r\n9: Jayant Verma\r\n6: Mohan Sharma\r\n55: Rahul Dev<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647613a4b2f92e6c72a6e8\/39-0.png\" alt=\"\u81ea\u5b9a\u4e49\u6bd4\u8f83\u5668\" \/><\/div>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u672c\u6559\u7a0b\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5982\u4f55\u5728Java\u4e2d\u6839\u636e\u503c\u5bf9HashMap\u8fdb\u884c\u6392\u5e8f\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u6839\u636e\u5b57\u7b26\u4e32\u503c\u8fdb\u884c\u6392\u5e8f\u4e0e\u6839\u636e\u6574\u6570\u503c\u8fdb\u884c\u6392\u5e8f\u7684\u65b9\u6cd5\u6709\u6240\u4e0d\u540c\u3002\u5bf9\u4e8e\u5b57\u7b26\u4e32\u503c\uff0c\u901a\u5e38\u9700\u8981\u501f\u52a9\u81ea\u5b9a\u4e49\u6bd4\u8f83\u5668\uff08Comparator\uff09\u6765\u5b9e\u73b0\u6392\u5e8f\u903b\u8f91\u3002\u800c\u5bf9\u4e8e\u6574\u6570\u503c\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u5229\u7528<code>Collections.sort()<\/code>\u65b9\u6cd5\u8fdb\u884c\u6392\u5e8f\uff0c\u56e0\u4e3a\u5b83\u80fd\u591f\u5904\u7406\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u5305\u88c5\u7c7b\u6216\u5b9e\u73b0\u4e86<code>Comparable<\/code>\u63a5\u53e3\u7684\u5bf9\u8c61\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5728Java\u4e2d\u5982\u4f55\u6839\u636e\u503c\u5bf9HashMap\u8fdb\u884c\u6392\u5e8f\uff1f\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51714\u90e8\u5206\uff09\u3002 Java\u4e2d\u7684HashMa [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[801,189,802,252,184],"class_list":["post-203","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-hashmap","tag-java","tag-802","tag-252","tag-184"],"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 HashMap\u6309\u503c\u6392\u5e8f\uff1a\u7ec8\u6781\u6307\u5357\u4e0e\u5b9e\u7528\u6280\u5de7 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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