{"id":31276,"date":"2023-12-24T21:20:11","date_gmt":"2022-12-16T01:35:24","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91map%e7%9a%84%e7%ac%94%e8%ae%b0\/"},"modified":"2025-08-12T23:12:08","modified_gmt":"2025-08-12T15:12:08","slug":"%e3%80%90java%e3%80%91map%e7%9a%84%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91map%e7%9a%84%e7%ac%94%e8%ae%b0\/","title":{"rendered":"\u3010Java\u3011Map\u7684\u7b14\u8bb0"},"content":{"rendered":"<h1>\u7684\u610f\u601d<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\uff11\u3064\u3067\u3042\u308b Map \u306b\u3064\u3044\u3066\u3001\u6574\u7406\u3057\u3066\u307f\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5404\u30af\u30e9\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u8a73\u7d30\u306a\u8aac\u660e\u306f\u3057\u307e\u305b\u3093\u3002<\/ul>\n<h1>\u4e3b\u8981\u7684\u8bfe\u7a0b<\/p>\n<dl>java.util.HashMap\u88ab\u79f0\u4e3a\u54c8\u5e0c\u6620\u5c04\u6216\u54c8\u5e0c\u8868\uff0c\u952e\u5bf9\u8c61\u9700\u8981\u6b63\u786e\u5b9e\u73b0hashCode()\u548cequals()\u65b9\u6cd5\u3002<\/dl>\n<p>java.util.LinkedHashMap\u57fa\u672c\u4e0a\u4e0eHashMap\u76f8\u540c\uff0c\u8fd4\u56de\u7684\u987a\u5e8f\u5728\u8fed\u4ee3\u5668\u4e2d\u88ab\u4fdd\u8bc1\uff08\u9ed8\u8ba4\u4e3a\u63d2\u5165\u987a\u5e8f\uff09\u3002\u9664\u4e86\u63d2\u5165\u987a\u5e8f\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528&#8221;\u8bbf\u95ee\u987a\u5e8f&#8221;\u3002\u8fd8\u53ef\u4ee5\u7528\u5b83\u6765\u521b\u5efaLRU\u7f13\u5b58\u3002\u53c2\u8003\uff1aLRU\u7f13\u5b58\u7684\u5b9e\u73b0\u3002<\/p>\n<p>java.util.TreeMap\u662f\u5e26\u6709\u6811\u7ed3\u6784\u7684\u6620\u5c04\u3002\u952e\u5bf9\u8c61\u9700\u8981\u5b9e\u73b0java.lang.Comparable\u63a5\u53e3\u6216\u660e\u786e\u6307\u5b9ajava.util.Comparator\u3002\u5e76\u4e14\u7ed3\u679c\u8981\u4e0eequals()\u65b9\u6cd5\u4e00\u81f4\u3002\u8fed\u4ee3\u5668\u8fd4\u56de\u7684\u987a\u5e8f\u662f\u4fdd\u8bc1\u7684\uff08\u6392\u5e8f\u987a\u5e8f\uff09\u3002<\/p>\n<p>java.util.EnumMap\u9002\u7528\u4e8e\u952e\u53ea\u6709\u4e00\u79cd\u679a\u4e3e\u7c7b\u578b\u7684\u60c5\u51b5\u3002\u5185\u5b58\u6548\u7387\u5f88\u9ad8\u3002\u8fed\u4ee3\u5668\u8fd4\u56de\u7684\u987a\u5e8f\u662f\u4fdd\u8bc1\u7684\uff08\u6309\u5e8f\u6570\u987a\u5e8f\uff09\u3002<\/p>\n<p>java.util.Hashtable\u662f\u65e7\u7684\u96c6\u5408\u6846\u67b6\uff0c\u57fa\u672c\u4e0a\u4e0d\u4f7f\u7528\u3002<\/p>\n<p>java.util.Properties\u4e5f\u662f\u65e7\u7684\u96c6\u5408\u6846\u67b6\uff0c\u662f\u4e00\u4e2a\u8d1f\u9762\u9057\u4ea7\u3002\u7531\u4e8e\u5728\u8bb8\u591aLibrary\u4e2d\u4f7f\u7528\u5230\uff0c\u6240\u4ee5\u4e0d\u80fd\u88ab\u5b8c\u5168\u820d\u5f03\u3002<\/p>\n<p>\u5176\u4ed6\u7c7b\u6709java.util.concurrent.ConcurrentHashMap\u3001java.util.IdentityHashMap\u548cjava.util.WeakHashMap\u7b49\u7b49\uff0c\u8fd8\u6709\u5f88\u591a\u5176\u4ed6\u7c7b\u3002<\/p>\n<h1>\u65b9\u4fbf\u7684\u5b9e\u7528\u5de5\u5177\u57fa\u672c\u4e0a\u96c6\u4e2d\u5728java.util.Collections\u4e2d\u3002<\/p>\n<h2>\u4e00\u5f20\u7a7a\u767d\u7684\u5730\u56fe<\/p>\n<ul class=\"post-ul\">java.util.Collections#emptyMap()<\/ul>\n<p>\u5982\u679c\u9700\u8981\u4e00\u4e2a\u7a7a\u7684\u5730\u56fe\uff0c\u6700\u597d\u4e0d\u8981\u6d6a\u8d39\u7528new HashMap()\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\uff0c\u800c\u662f\u4f7f\u7528\u4e0d\u53d8\u7684\u5bf9\u8c61\u8fdb\u884c\u91cd\u590d\u5229\u7528\u3002\u8bf7\u6ce8\u610f\uff0c\u5b83\u662f\u4e0d\u53ef\u53d8\u7684\u3002<\/p>\n<ul class=\"post-ul\">java.util.Map#of()<\/ul>\n<p>\u4eceJava 9\u5f00\u59cb\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u751f\u6210\u4e0d\u53ef\u66f4\u6539\u7684\u7a7a\u6620\u5c04\u3002\u8fd9\u4e2a\u9009\u9879\u66f4\u7b80\u6d01\u3002<\/p>\n<h2>\u53ea\u6709\u4e00\u4e2a\u8981\u7d20\u7684\u5730\u56fe<\/p>\n<ul class=\"post-ul\">java.util.Collections#singletonMap()<\/ul>\n<p>\u6ce8\u610f\uff0c\u65e0\u6cd5\u66f4\u6539\u3002<\/p>\n<ul class=\"post-ul\">java.util.Map#of(K, V)<\/ul>\n<p>\u4eceJava9\u5f00\u59cb\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u751f\u6210\u4e0d\u53ef\u66f4\u6539\u76841\u4e2a\u5143\u7d20\u7684\u6620\u5c04\u3002\u8fd9\u4e2a\u66f4\u7b80\u6d01\u3002<\/p>\n<h2>\u65e0\u6cd5\u66f4\u6539\u4e3a\u5730\u56fe\u5316java.util.Collections#unmodifiableMap()<\/p>\n<p>java.util.Collections#unmodifiableSortedMap()<\/p>\n<p>java.util.Map#of(K, V, K, V, &#8230;)<\/p>\n<p>\u4eceJava 9\u5f00\u59cb\uff0c\u53ef\u4ee5\u76f4\u63a5\u751f\u6210\u4e0d\u53ef\u66f4\u6539\u7684\u6620\u5c04\u3002<br \/>\n\u4f46\u662f\uff0c\u7531\u4e8e\u9700\u8981\u4ea4\u66ff\u6307\u5b9a\u4e24\u79cd\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u6240\u4ee5\u5b83\u4e0d\u662f\u53ef\u53d8\u53c2\u6570\u65b9\u6cd5\u3002<br \/>\n\u6709\u63d0\u4f9b\u4e8610\u5bf9\u521d\u59cb\u503c\u7684\u65b9\u6cd5\u8fdb\u884c\u91cd\u8f7d\u5b9a\u4e49\u3002<\/p>\n<h2>\u5c06\u540c\u671f\u8f6c\u5316\u4e3a\u5730\u56fe<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">java.util.Collections#synchronizedMap()<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">java.util.Collections#synchronizedSortedMap()<\/ul>\n<p>\u4e5f\u8bb8\u8003\u8651\u4f7f\u7528java.util.concurrent.ConcurrentHashMap\u6bd4\u540c\u6b65\u5316\u66f4\u597d\uff0c\u610f\u601d\u7a0d\u6709\u4e0d\u540c\u3002<\/p>\n<h2>\u52a8\u6001\u62c5\u4fdd<\/p>\n<ul class=\"post-ul\">java.util.Collections#checkedMap()<\/ul>\n<h1>\u4f7f\u7528LinkedHashMap\u800c\u4e0d\u662fHashMap\u5728HashMap\u4e2d\uff0c\u65e0\u6cd5\u4fdd\u8bc1\u5728\u4f7f\u7528\u8fed\u4ee3\u5668\u7b49\u65b9\u5f0f\u83b7\u53d6\u5168\u90e8\u5143\u7d20\u65f6\u7684\u987a\u5e8f\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5728\u5355\u5143\u6d4b\u8bd5\u9a8c\u8bc1\u6216\u6545\u969c\u6392\u9664\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u56f0\u96be\u3002<\/p>\n<p>\u4f7f\u7528\u6709\u5e8f\u7684LinkedHashMap\u6bd4\u8f83\u591a\u65f6\u4f1a\u66f4\u52a0\u65b9\u4fbf\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u660e\u786e\u89c4\u5b9a\u83b7\u53d6\u6570\u636e\u7684\u987a\u5e8f\u3002<\/p>\n<h1>\u5730\u56fe\u7684\u521d\u59cb\u5316<\/p>\n<h2>\u533f\u540d\u7c7b\u548c\u521d\u59cb\u5316\u5668\u3002<br \/>\n\u5728\u521d\u59cb\u5316Map\u65f6\uff0c\u6709\u65f6\u4f1a\u4f7f\u7528\u4ee5\u4e0b\u6280\u5de7\uff0c\u7ed3\u5408\u533f\u540d\u7c7b\u548c\u521d\u59cb\u5316\u5757\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u4f7f\u3044\u65b9<\/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\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/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\">String<\/span><span class=\"o\">&gt;()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"o\">{<\/span>\r\n        <span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">};<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u8ba4\u4e3a\u8fd9\u79cd\u65b9\u6cd5\u5b58\u5728\u4e00\u4e9b\u5927\u5c0f\u5404\u79cd\u95ee\u9898\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u521d\u671f\u5316\u3054\u3068\u306b\u533f\u540d\u30af\u30e9\u30b9\u304c\u4f5c\u3089\u308c\u308b\uff08\u5f71\u97ff\uff1a\u5c0f\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u30aa\u30da\u30ec\u30fc\u30bf\u304c\u4f7f\u7528\u3067\u304d\u306a\u3044\uff08\u5f71\u97ff\uff1a\u6975\u5c0f\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">HashMap \u306a\u3069\u306f\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u53ef\u80fd\u3060\u304c\u3001serialVersionUID \u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\uff08\u5f71\u97ff\uff1a\u5c0f\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u5185\u306a\u3069\u3067\u751f\u6210\u3057\u305f\u5834\u5408\u3001\u30a2\u30a6\u30bf\u30fc\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u6697\u9ed9\u306e\u3046\u3061\u306b\u4fdd\u6301\u3055\u308c\u308b\uff08\u5f71\u97ff\uff1a\u5927\uff09<\/ul>\n<p>\u5728\u7279\u522b\u662f\u6301\u6709\u6700\u540e\u5916\u90e8\u7c7b\u7684\u5b9e\u4f8b\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u4ee5\u4e0b\u95ee\u9898\uff08\u5982\u679c\u5728\u7c7b\u7684\u9759\u6001\u8303\u56f4\u5185\u751f\u6210\uff0c\u5219\u53ef\u4ee5\u89e3\u51b3\u95ee\u9898\uff09\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\uff08\u5fc5\u8981\u306a\u306e\u306fMap\u3060\u3051\u306a\u306e\u306b\u3001\u30a2\u30a6\u30bf\u30fc\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3082\u305a\u3063\u3068\u4fdd\u6301\u3057\u3066\u3057\u307e\u3046\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u5931\u6557\uff08Map\u3092\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u305f\u3044\u304c\u3001\u30a2\u30a6\u30bf\u30fc\u30af\u30e9\u30b9\u304c\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u4e0d\u53ef\u80fd\u306e\u5834\u5408\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u30b5\u30a4\u30ba\u304c\u7121\u99c4\u306b\u5927\u304d\u304f\u306a\u308b\uff08\u30a2\u30a6\u30bf\u30fc\u30af\u30e9\u30b9\u3082\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u53ef\u80fd\u306a\u5834\u5408\uff09<\/ul>\n<p>\u5047\u8bbe\u5728\u5b9e\u4f8b\u8303\u56f4\u5185\u751f\u6210\u5982\u4e0b\u7684Map\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.HashMap<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Map<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Test<\/span> <span class=\"o\">{<\/span>\r\n\r\n\t<span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/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\">String<\/span><span class=\"o\">&gt;()<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"o\">{<\/span>\r\n\t\t\t\t<span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n\t\t\t\t<span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n\t\t\t\t<span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"o\">}<\/span>\r\n\t\t<span class=\"o\">};<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u533f\u540d\u7c7b\u7684\u53cd\u7f16\u8bd1\u7ed3\u679c\u3002\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5b83\u6301\u6709\u5916\u90e8\u7c7b\uff08\u5728\u8fd9\u91cc\u662f Test \u7c7b\uff09\u7684\u5b9e\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.HashMap<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Test<\/span><span class=\"err\">$<\/span><span class=\"mi\">1<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">HashMap<\/span>\r\n<span class=\"o\">{<\/span>\r\n\r\n    <span class=\"kd\">final<\/span> <span class=\"nc\">Test<\/span> <span class=\"k\">this<\/span><span class=\"err\">$<\/span><span class=\"mi\">0<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"nc\">Test<\/span><span class=\"err\">$<\/span><span class=\"mi\">1<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"o\">{<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"err\">$<\/span><span class=\"mi\">0<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Test<\/span><span class=\"o\">.<\/span><span class=\"na\">this<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kd\">super<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5efa\u9020\u8005\u6a21\u5f0f<br \/>\n\u4f7f\u7528\u4ee5\u4e0b\u7684\u751f\u6210\u5668\u7c7b\u522b\u4e5f\u662f\u975e\u5e38\u5e38\u89c1\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Collections<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.LinkedHashMap<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Map<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"cm\">\/**\r\n * Map\u30d3\u30eb\u30c0\u30fc.&lt;br&gt;\r\n * \u5404\u30e1\u30bd\u30c3\u30c9\u306f\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u547c\u3073\u51fa\u3059\u3053\u3068\u3092\u60f3\u5b9a.&lt;br&gt;\r\n *\/<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">MapBuilder<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">{<\/span>\r\n\r\n\t<span class=\"cm\">\/** \u751f\u6210\u3057\u305fMap *\/<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span><span class=\"o\">;<\/span>\r\n\r\n\t<span class=\"cm\">\/** Map\u30d3\u30eb\u30c0\u30fc\u3092\u751f\u6210 *\/<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"nf\">MapBuilder<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">LinkedHashMap<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"cm\">\/** Map\u306b\u5024\u3092\u767b\u9332 *\/<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">MapBuilder<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">put<\/span><span class=\"o\">(<\/span><span class=\"no\">K<\/span> <span class=\"n\">key<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span> <span class=\"n\">value<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"n\">key<\/span><span class=\"o\">,<\/span> <span class=\"n\">value<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"k\">this<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"cm\">\/** \u7de8\u96c6\u53ef\u80fd\u306aMap\u3092\u8fd4\u3059 *\/<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">toMap<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">map<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"cm\">\/** \u7de8\u96c6\u4e0d\u53ef\u306aMap\u3092\u8fd4\u3059 *\/<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">toConst<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">unmodifiableMap<\/span><span class=\"o\">(<\/span><span class=\"n\">map<\/span><span class=\"o\">);<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u4f7f\u3044\u65b9<\/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\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">MapBuilder<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;()<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">toConst<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<p>\u4f18\u70b9\u662f\u53ef\u4ee5\u521b\u5efa\u53ef\u7f16\u8f91\u548c\u4e0d\u53ef\u7f16\u8f91\u7684\u5730\u56fe\u3002<\/p>\n<p>\u7f3a\u70b9\u662f\u65e0\u6cd5\u4f7f\u7528\u94bb\u77f3\u64cd\u4f5c\u5458\u3002<\/p>\n<h2>\u533f\u540d\u51fd\u6570<br \/>\n\u5982\u679c\u60a8\u786e\u5b9e\u4e0d\u60f3\u5199\u4e24\u6b21\u6cdb\u578b\u7c7b\u578b\u7684\u8bdd\uff0c\u4f3c\u4e4e\u4e5f\u6709\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">toMap<\/span><span class=\"o\">(<\/span><span class=\"nc\">Consumer<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;&gt;<\/span> <span class=\"n\">initializer<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">LinkedHashMap<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n    <span class=\"n\">initializer<\/span><span class=\"o\">.<\/span><span class=\"na\">accept<\/span><span class=\"o\">(<\/span><span class=\"n\">map<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">map<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u4f7f\u3044\u65b9<\/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\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"n\">toMap<\/span><span class=\"o\">(<\/span><span class=\"n\">m<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">});<\/span>\r\n<\/code><\/pre>\n<h2>Java 8u60\u4ee5\u540e\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8eLambda\u548cReflection\u3002<br \/>\n\u636e\u8bf4\u5728Java8u60\u6216\u66f4\u9ad8\u7248\u672c\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u53cd\u5c04\u83b7\u53d6Lambda\u8868\u8fbe\u5f0f\u7684\u53c2\u6570\u540d\u79f0\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5b9e\u73b0\u4e00\u79cd\u6709\u8da3\u7684\u521d\u59cb\u5316\u65b9\u5f0f\u3002<\/p>\n<p>\u5728Java 8u60\u4e2d\uff0c\u5173\u4e8eMap\u7684\u521d\u59cb\u5316\u7b49\u65b9\u9762\u53d8\u5f97\u975e\u5e38\u7b80\u4fbf\u3002<\/p>\n<p>\u6211\u53ea\u9009\u62e9\u4e86\u4e0e\u76f8\u5173\u90e8\u5206\uff0c\u7136\u540e\u6267\u884c\u4e86\u4e00\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.io.Serializable<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.invoke.SerializedLambda<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.reflect.Method<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.lang.reflect.Parameter<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Arrays<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Collections<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Map<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.function.Function<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.stream.Collectors<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"cm\">\/** \u30e9\u30e0\u30c0\u5f0f\u306e\u5909\u6570\u540d\u3092\u53d6\u5f97\u3057\u3066\u30de\u30c3\u30d7\u3092\u5b9a\u7fa9\u3059\u308b\u30c6\u30b9\u30c8 *\/<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">LambdaNameMap<\/span> <span class=\"o\">{<\/span>\r\n\t\r\n\t<span class=\"cm\">\/** \u30c6\u30b9\u30c8\u5b9f\u884c *\/<\/span>\r\n\t<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\t\t<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\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">getProperty<\/span><span class=\"o\">(<\/span><span class=\"s\">\"java.version\"<\/span><span class=\"o\">));<\/span>\r\n\t\t\r\n        <span class=\"c1\">\/\/ \u3053\u3093\u306a\u611f\u3058\u3067\u30de\u30c3\u30d7\u304c\u4f5c\u308c\u308b<\/span>\r\n\t\t<span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"n\">toConstMap<\/span><span class=\"o\">(<\/span>\r\n\t\t\t\t<span class=\"n\">one<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">,<\/span>\r\n\t\t\t\t<span class=\"n\">two<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">,<\/span>\r\n\t\t\t\t<span class=\"n\">three<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n\t\t\r\n\t\t<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\">map<\/span><span class=\"o\">);<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"cm\">\/** \u540d\u524d\u4ed8\u304d\u306e\u5024\u306e\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9 *\/<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kd\">interface<\/span> <span class=\"nc\">NamedValue<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Function<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"no\">T<\/span><span class=\"o\">&gt;,<\/span> <span class=\"nc\">Serializable<\/span> <span class=\"o\">{<\/span>\r\n\t\t\r\n\t\t<span class=\"k\">default<\/span> <span class=\"no\">T<\/span> <span class=\"nf\">value<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"nf\">apply<\/span><span class=\"o\">(<\/span><span class=\"n\">name<\/span><span class=\"o\">());<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t\t\r\n\t\t<span class=\"k\">default<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">name<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"nf\">getName<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\t\r\n\t<span class=\"cm\">\/** \u5909\u66f4\u4e0d\u80fd\u30de\u30c3\u30d7\u3092\u751f\u6210 *\/<\/span>\r\n\t<span class=\"nd\">@SafeVarargs<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">toConstMap<\/span><span class=\"o\">(<\/span><span class=\"nc\">NamedValue<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;...<\/span> <span class=\"n\">namedValues<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">(<\/span><span class=\"n\">namedValues<\/span><span class=\"o\">)<\/span>\r\n\t\t\t\t<span class=\"o\">.<\/span><span class=\"na\">collect<\/span><span class=\"o\">(<\/span><span class=\"nc\">Collectors<\/span><span class=\"o\">.<\/span><span class=\"na\">toMap<\/span><span class=\"o\">(<\/span><span class=\"n\">namedValue<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">namedValue<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span><span class=\"o\">(),<\/span> <span class=\"n\">namedValue<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">namedValue<\/span><span class=\"o\">.<\/span><span class=\"na\">value<\/span><span class=\"o\">()));<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">unmodifiableMap<\/span><span class=\"o\">(<\/span><span class=\"n\">map<\/span><span class=\"o\">);<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"cm\">\/** \u30e9\u30e0\u30c0\u5f0f\u304b\u3089\u5909\u6570\u306e\u540d\u524d\u3092\u53d6\u5f97 *\/<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getName<\/span><span class=\"o\">(<\/span><span class=\"nc\">Function<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">func<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"nc\">SerializedLambda<\/span> <span class=\"n\">lambdaInfo<\/span> <span class=\"o\">=<\/span> <span class=\"n\">toSerializedLambda<\/span><span class=\"o\">(<\/span><span class=\"n\">func<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"nc\">Method<\/span> <span class=\"n\">method<\/span> <span class=\"o\">=<\/span> <span class=\"n\">getMethod<\/span><span class=\"o\">(<\/span><span class=\"n\">lambdaInfo<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n\t\t\r\n\t\t<span class=\"nc\">Parameter<\/span> <span class=\"n\">parameter<\/span> <span class=\"o\">=<\/span> <span class=\"n\">method<\/span><span class=\"o\">.<\/span><span class=\"na\">getParameters<\/span><span class=\"o\">()[<\/span><span class=\"mi\">0<\/span><span class=\"o\">];<\/span>\r\n\t\t<span class=\"k\">if<\/span> <span class=\"o\">(!<\/span><span class=\"n\">parameter<\/span><span class=\"o\">.<\/span><span class=\"na\">isNamePresent<\/span><span class=\"o\">())<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">IllegalStateException<\/span><span class=\"o\">(<\/span><span class=\"s\">\"no name\"<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">parameter<\/span><span class=\"o\">.<\/span><span class=\"na\">getName<\/span><span class=\"o\">();<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\t\r\n\t<span class=\"cm\">\/** SerializedLambda \u304b\u3089\u6307\u5b9a\u306e\u30b7\u30b0\u30cd\u30c1\u30e3\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u53d6\u5f97 *\/<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"nc\">Method<\/span> <span class=\"nf\">getMethod<\/span><span class=\"o\">(<\/span><span class=\"nc\">SerializedLambda<\/span> <span class=\"n\">lambdaInfo<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Class<\/span><span class=\"o\">&lt;?&gt;...<\/span> <span class=\"n\">argClasses<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"c1\">\/\/ \u5b9f\u88c5\u30af\u30e9\u30b9\u540d<\/span>\r\n\t\t\t<span class=\"nc\">String<\/span> <span class=\"n\">implClassName<\/span> <span class=\"o\">=<\/span> <span class=\"n\">lambdaInfo<\/span><span class=\"o\">.<\/span><span class=\"na\">getImplClass<\/span><span class=\"o\">().<\/span><span class=\"na\">replace<\/span><span class=\"o\">(<\/span><span class=\"sc\">'\/'<\/span><span class=\"o\">,<\/span> <span class=\"sc\">'.'<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"nc\">Class<\/span><span class=\"o\">&lt;?&gt;<\/span> <span class=\"n\">implClass<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Class<\/span><span class=\"o\">.<\/span><span class=\"na\">forName<\/span><span class=\"o\">(<\/span><span class=\"n\">implClassName<\/span><span class=\"o\">);<\/span>\r\n\t\t\t\r\n\t\t\t<span class=\"c1\">\/\/ \u5b9f\u88c5\u30e1\u30bd\u30c3\u30c9\u540d<\/span>\r\n\t\t\t<span class=\"nc\">String<\/span> <span class=\"n\">implMethodName<\/span> <span class=\"o\">=<\/span> <span class=\"n\">lambdaInfo<\/span><span class=\"o\">.<\/span><span class=\"na\">getImplMethodName<\/span><span class=\"o\">();<\/span>\r\n\t\t\t<span class=\"nc\">Method<\/span> <span class=\"n\">implMethod<\/span> <span class=\"o\">=<\/span> <span class=\"n\">implClass<\/span><span class=\"o\">.<\/span><span class=\"na\">getDeclaredMethod<\/span><span class=\"o\">(<\/span><span class=\"n\">implMethodName<\/span><span class=\"o\">,<\/span> <span class=\"n\">argClasses<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"n\">implMethod<\/span><span class=\"o\">;<\/span>\r\n\t\t<span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">RuntimeException<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\t\r\n\t<span class=\"cm\">\/** \u30e9\u30e0\u30c0\u5f0f\u304b\u3089 SerializedLambda \u3092\u53d6\u5f97 *\/<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"nc\">SerializedLambda<\/span> <span class=\"nf\">toSerializedLambda<\/span><span class=\"o\">(<\/span><span class=\"nc\">Object<\/span> <span class=\"n\">lambda<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"nc\">Method<\/span> <span class=\"n\">replaceMethod<\/span> <span class=\"o\">=<\/span> <span class=\"n\">lambda<\/span><span class=\"o\">.<\/span><span class=\"na\">getClass<\/span><span class=\"o\">().<\/span><span class=\"na\">getDeclaredMethod<\/span><span class=\"o\">(<\/span><span class=\"s\">\"writeReplace\"<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"n\">replaceMethod<\/span><span class=\"o\">.<\/span><span class=\"na\">setAccessible<\/span><span class=\"o\">(<\/span><span class=\"kc\">true<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"o\">(<\/span><span class=\"nc\">SerializedLambda<\/span><span class=\"o\">)<\/span> <span class=\"n\">replaceMethod<\/span><span class=\"o\">.<\/span><span class=\"na\">invoke<\/span><span class=\"o\">(<\/span><span class=\"n\">lambda<\/span><span class=\"o\">);<\/span>\r\n\r\n\t\t<span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">RuntimeException<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u7f16\u8bd1\u65f6\uff0c\u9700\u8981\u5728javac\u547d\u4ee4\u540e\u52a0\u4e0a-parameters\u9009\u9879\u3002<\/p>\n<p>\u5982\u679c\u662f\u5728Eclipse\u4e2d\u7684\u60c5\u51b5\u4e0b\uff0c\u8bf7\u5728\u504f\u597d\u8bbe\u7f6e\u7684Java\/\u7f16\u8bd1\u5668\u4e2d\u7684&#8221;\u5b58\u50a8\u6709\u5173\u65b9\u6cd5\u53c2\u6570\u7684\u4fe1\u606f\uff08\u53ef\u901a\u8fc7\u53cd\u5c04\u4f7f\u7528\uff09&#8221;\u9009\u9879\u4e0a\u8fdb\u884c\u52fe\u9009\uff0c\u800c\u4e0d\u662f\u4f7f\u7528-parameters\u53c2\u6570\u3002\uff08\u6216\u8005\u5728\u9879\u76ee\u5c5e\u6027\u7684Java\u7f16\u8bd1\u5668\u4e2d\u627e\u5230\u76f8\u540c\u7684\u9009\u9879\uff09<\/p>\n<p>\u6267\u884c\u7ed3\u679c\u5982\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code>1.8.0_65\r\n{one=1st, three=3rd, two=2nd}\r\n<\/code><\/pre>\n<p>\u8fd9\u975e\u5e38\u6709\u8da3\uff0c\u4f46\u4e5f\u53ef\u80fd\u5b58\u5728\u7f3a\u70b9\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ad\u30fc\u306f\u5909\u6570\u540d\u306b\u4f7f\u3048\u308b\u3082\u306e\u3060\u3051<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u73fe\u6642\u70b9\u3067\u306f\u52d5\u4f5c\u74b0\u5883\u304c\u5c11\u306a\u3044\uff08Java9\u306a\u3069\u306b\u5207\u308a\u66ff\u308f\u3063\u305f\u5f8c\u306a\u3089\u5b89\u5fc3\u3057\u3066\u4f7f\u3048\u308b\u304b\u3082\u306d\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u5909\u66f4\u3057\u306a\u3044\u3068\u4f7f\u3048\u306a\u3044<\/ul>\n<h2>\u4e00\u822c\u7684\u542f\u52a8<br \/>\n\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u8ba4\u4e3a\u5e94\u8be5\u76f4\u63a5\u800c\u4e0d\u4f7f\u7528\u5947\u602a\u7684\u6280\u5de7\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n<p>\u5728\u7c7b\u9759\u6001\u53d8\u91cf\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528static\u521d\u59cb\u5316\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"no\">CONST_MAP<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kd\">static<\/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=\"n\">string<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">LinkedHashMap<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"no\">CONST_MAP<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">unmodifiableMap<\/span><span class=\"o\">(<\/span><span class=\"n\">map<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u662f\u5b9e\u4f8b\u53d8\u91cf\uff0c\u5219\u4f7f\u7528\u521d\u59cb\u5316\u5668\u6216\u6784\u9020\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">private<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">{<\/span>\r\n    <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">LinkedHashMap<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u662f\u672c\u5730\u53d8\u91cf\uff0c\u5219\u5728\u751f\u6210\u540e\u6309\u987a\u5e8f\u8fdb\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"n\">string<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">LinkedHashMap<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n<span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u6216\u8005\uff0c\u6211\u8ba4\u4e3a\u4eba\u4eec\u7ecf\u5e38\u4f1a\u51c6\u5907\u4e00\u4e2a\u751f\u6210\u5730\u56fe\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"no\">CONST_MAP<\/span> <span class=\"o\">=<\/span> <span class=\"n\">createMap<\/span><span class=\"o\">();<\/span>\r\n\r\n<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">createMap<\/span><span class=\"o\">()<\/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=\"n\">string<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">LinkedHashMap<\/span><span class=\"o\">&lt;&gt;();<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">unmodifiableMap<\/span><span class=\"o\">(<\/span><span class=\"n\">map<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>Java 9\u4e4b\u540e\u7684\u521d\u59cb\u5316\uff08\u4e0d\u53ef\u66f4\u6539\u5217\u8868\uff09<br \/>\n\u5982\u524d\u6240\u8ff0\uff0cJava 9 \u73b0\u5728\u53ef\u4ee5\u8f7b\u677e\u751f\u6210\u4e0d\u53ef\u66f4\u6539\u7684\u5217\u8868\u3002<\/p>\n<p>\u7136\u800c\uff0c\u7531\u4e8e\u53c2\u6570\u7684\u7c7b\u578b\u6709\u4e24\u79cd\u60c5\u51b5\uff0c\u56e0\u6b64\u5b83\u5e76\u4e0d\u662f\u53ef\u53d8\u53c2\u6570\uff0c\u800c\u662f\u901a\u8fc7\u53c2\u6570\u7684\u521d\u59cb\u503c\u6765\u5b9e\u73b0\u91cd\u8f7d\uff0c\u8303\u56f4\u4e3a0\u81f310\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"no\">CONST_MAP<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span>\r\n    <span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">,<\/span>\r\n    <span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">,<\/span>\r\n    <span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u8fd8\u6709\u4e00\u79cd\u4f7f\u7528Map\uff03ofEntries\u7684\u751f\u6210\u65b9\u6cd5\u3002\u8fd9\u662f\u56e0\u4e3a\u5b83\u5c06Map.Entry\u4f5c\u4e3a\u53d8\u957f\u53c2\u6570\uff0c\u6240\u4ee5\u6ca1\u6709\u6570\u91cf\u9650\u5236\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Map<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">static<\/span> <span class=\"n\">java<\/span><span class=\"o\">.<\/span><span class=\"na\">util<\/span><span class=\"o\">.<\/span><span class=\"na\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">entry<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ ...<\/span>\r\n\r\n<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"no\">CONST_MAP<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">ofEntries<\/span><span class=\"o\">(<\/span>\r\n    <span class=\"n\">entry<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">),<\/span>\r\n    <span class=\"n\">entry<\/span><span class=\"o\">(<\/span><span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">),<\/span>\r\n    <span class=\"n\">entry<\/span><span class=\"o\">(<\/span><span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">));<\/span>\r\n<\/code><\/pre>\n<h1>Hashtable \u7684 contains() \u65b9\u6cd5Map\u63a5\u53e3\u6709containsKey()\u548ccontainsValue()\u65b9\u6cd5\u3002<br \/>\n\u7136\u800c\uff0c\u65e7\u7684Hashtable\u548c\u5176\u5b50\u7c7bProperties\u8fd8\u6709contains()\u65b9\u6cd5\u3002\u4ece\u529f\u80fd\u4e0a\u8bb2\uff0c\u5b83\u4e0econtainsValue()\u662f\u76f8\u540c\u7684\u3002<br \/>\n\u6ce8\u610f\u4e0d\u8981\u628a\u5b83\u4e0econtainsKey()\u6df7\u6dc6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7684\u610f\u601d Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\uff11\u3064\u3067\u3042\u308b Map \u306b\u3064\u3044\u3066\u3001\u6574\u7406\u3057\u3066\u307f\u307e\u3059\u3002 &nbsp; \u5404 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31276","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO 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