{"id":46884,"date":"2023-06-08T23:06:46","date_gmt":"2024-01-03T07:07:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-util-%e6%80%bb%e7%bb%931%ef%bc%88hashmap%e3%80%81map-entry%ef%bc%89\/"},"modified":"2024-04-30T07:58:33","modified_gmt":"2024-04-29T23:58:33","slug":"java-util-%e6%80%bb%e7%bb%931%ef%bc%88hashmap%e3%80%81map-entry%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-util-%e6%80%bb%e7%bb%931%ef%bc%88hashmap%e3%80%81map-entry%ef%bc%89\/","title":{"rendered":"Java.util \u603b\u7ed31\uff08HashMap\u3001Map.Entry\uff09"},"content":{"rendered":"<h2>\u54c8\u5e0c\u6620\u5c04\u7c7b<\/h2>\n<p>\u4e00\u79cd\u88ab\u79f0\u4e3a&#8221;\u5173\u8054\u6570\u7ec4&#8221;\u7684\u6570\u636e\u7ed3\u6784\u3002\u5173\u8054\u6570\u7ec4\u901a\u8fc7\u4f7f\u7528\u952e\u548c\u503c\u7684\u7ec4\u5408\uff08\u8fd9\u4e2a\u7ec4\u5408\u88ab\u79f0\u4e3a\u6761\u76ee\uff09\u6765\u5b58\u50a8\u548c\u6ce8\u518c\u5143\u7d20\u3002<\/p>\n<p>\u73b0\u5728\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528HashMap\u7c7b\u6765\u6dfb\u52a0\u952e\u548c\u503c\uff0c\u4ee5\u53ca\u5176\u4ed6\u5404\u79cd\u64cd\u4f5c\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\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">HashMapSample<\/span><span class=\"o\">{<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">){<\/span>\r\n        <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=\"n\">hashmap<\/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>\r\n\r\n        <span class=\"n\">hashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hadoop\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"Java\"<\/span><span class=\"o\">);<\/span>  <span class=\"c1\">\/\/\u30ad\u30fc\u3001\u5024\u3092hashmap\u306b\u683c\u7d0d<\/span>\r\n        <span class=\"n\">hashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Spark\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"Scala\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">hashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Kafka\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"Java\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">hashmap<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">hashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">containsKey<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hadoop\"<\/span><span class=\"o\">)){<\/span>\r\n            <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hadoop!!\"<\/span><span class=\"o\">);<\/span>\r\n            <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">hashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hadoop\"<\/span><span class=\"o\">));<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>The execution result is&#8230;<\/p>\n<pre class=\"post-pre\"><code>{Hadoop=Java, Kafka=Java, Spark=Scala}\r\nHadoop!!\r\nJava\r\n<\/code><\/pre>\n<p>\u9644\u8fd1\uff0c\u786e\u8ba4\u5df2\u5c06\u952e=\u503c\u5b58\u50a8\u5728\u5176\u4e2d\u3002<\/p>\n<h3>put\u65b9\u6cd5<\/h3>\n<p>\u5c06\u952e\u503c\u5bf9\u5b58\u50a8\u5230HashMap\u4e2d\u3002<\/p>\n<h3>\u5305\u542b\u6709\u952e\u65b9\u6cd5<\/h3>\n<p>\u5982\u679cHashMap\u5185\u5b58\u5728\u6307\u5b9a\u7684\u952e\uff0c\u5219\u8fd4\u56de\u8be5\u952e\u7684\u503c\u3002<\/p>\n<h2>Map.Entry\u63a5\u53e3-<\/h2>\n<p>\u5177\u6709\u5730\u56fe\u6761\u76ee\u7684\u5bf9\u8c61\u3002\u53ef\u4ee5\u4f7f\u7528\u8fed\u4ee3\u5668\u83b7\u53d6\u5230\u5730\u56fe\u6761\u76ee\u7684\u5f15\u7528\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.Entry<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.util.WeakHashMap<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">EntrySample<\/span><span class=\"o\">{<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">){<\/span>\r\n        <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=\"n\">hashmap<\/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>\r\n        <span class=\"nc\">WeakHashMap<\/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\">weakhashmap<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">WeakHashMap<\/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\r\n        <span class=\"n\">weakhashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hadoop\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"Java\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">weakhashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Spark\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"Scala\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">weakhashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Kafka\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"Java\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"WeakHashMap:\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">weakhashmap<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"k\">for<\/span><span class=\"o\">(<\/span><span class=\"nc\">Entry<\/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\">entry<\/span> <span class=\"o\">:<\/span> <span class=\"n\">weakhashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">entrySet<\/span><span class=\"o\">()){<\/span>\r\n            <span class=\"n\">hashmap<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"n\">entry<\/span><span class=\"o\">.<\/span><span class=\"na\">getKey<\/span><span class=\"o\">(),<\/span> <span class=\"n\">entry<\/span><span class=\"o\">.<\/span><span class=\"na\">getValue<\/span><span class=\"o\">());<\/span>\r\n        <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"HashMap:\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">hashmap<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e2d\u6587\u672c\u5730\u5316\u91ca\u4e49\u4ee5\u4e0b\u53e5\u5b50\uff0c\u53ea\u63d0\u4f9b\u4e00\u79cd\u9009\u62e9\uff1a<br \/>\n\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>WeakHashMap:\r\n{Kafka=Java, Hadoop=Java, Spark=Scala}\r\n\r\nHashMap:\r\n{Hadoop=Java, Kafka=Java, Spark=Scala}\r\n<\/code><\/pre>\n<p>\u6211\u628a WeakHashMap \u4e2d\u7684\u5185\u5bb9\u79fb\u52a8\u5230\u4e86 HashMap \u4e2d\u3002<\/p>\n<h3>entrySet\u65b9\u6cd5<\/h3>\n<p>\u5728Map\u7c7b\u7684\u65b9\u6cd5\u4e2d\uff0c\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6620\u5c04\u96c6\u5408\u7684\u5bf9\u8c61\u3002<\/p>\n<h3>getKey\u65b9\u6cd5<\/h3>\n<p>\u8fd4\u56de\u4e0e\u6761\u76ee\u5bf9\u5e94\u7684\u952e\u3002<\/p>\n<h3>\u53d6\u5f97getValue\u65b9\u6cd5<\/h3>\n<p>\u8fd4\u56de\u5bf9\u6761\u76ee\u7684\u503c\u3002<\/p>\n<h2>\u7ed3\u675f<\/h2>\n<p>\u5982\u679c\u60a8\u6709\u4efb\u4f55\u610f\u89c1\u3001\u66f4\u6b63\u6216\u6307\u5bfc\uff0c\u8bf7\u968f\u610f\u63d0\u51fa\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u54c8\u5e0c\u6620\u5c04\u7c7b \u4e00\u79cd\u88ab\u79f0\u4e3a&#8221;\u5173\u8054\u6570\u7ec4&#8221;\u7684\u6570\u636e\u7ed3\u6784\u3002\u5173\u8054\u6570\u7ec4\u901a\u8fc7\u4f7f\u7528\u952e\u548c\u503c\u7684\u7ec4\u5408\uff08\u8fd9\u4e2a\u7ec4\u5408\u88ab [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-46884","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java.util \u603b\u7ed31\uff08HashMap\u3001Map.Entry\uff09 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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