{"id":31059,"date":"2023-02-13T07:31:07","date_gmt":"2023-06-06T12:54:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%9a%84-map-%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/"},"modified":"2025-08-12T22:06:36","modified_gmt":"2025-08-12T14:06:36","slug":"java-%e7%9a%84-map-%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%9a%84-map-%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/","title":{"rendered":"Java \u7684 Map \u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<h2>\u5730\u56fe<\/h2>\n<p>\u5730\u56fe\u662f\u4e00\u79cd\u4ee5\u552f\u4e00\u952e\u548c\u503c\u5bf9\u8fdb\u884c\u7ba1\u7406\u7684\u6570\u636e\u7ed3\u6784\u3002\u6839\u636e\u4e0d\u540c\u7684\u8bed\u8a00\uff0c\u5b83\u88ab\u79f0\u4e3a\u5b57\u5178\u3001\u54c8\u5e0c\u6216\u5173\u8054\u6570\u7ec4\u3002<br \/>\n\u952e\u662f\u5730\u56fe\u7684\u4e00\u4e2a\u91cd\u8981\u7279\u5f81\uff0c\u5b83\u5b58\u50a8\u6709\u610f\u4e49\u7684\u4fe1\u606f\u3002<\/p>\n<h2>\u9996\u5148\u8ba9\u6211\u4eec\u8bd5\u7740\u5199\u4e0b\u6765&#8230;<\/h2>\n<p>Main.java \u7684\u4e2d\u6587\u7ffb\u8bd1\u9009\u9879\uff1a\u4e3b\u7a0b\u5e8f.java<\/p>\n<pre class=\"post-pre\"><code>package com.company;\r\n\r\nimport java.util.HashMap;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n    public static void main(String[] args) {\r\n        var map = new HashMap&lt;String, String&gt;(Map.of(\"Rose\", \"\u30d0\u30e9\",\r\n                \"Sunflower\", \"\u3072\u307e\u308f\u308a\", \"Morning Glory\", \"\u3042\u3055\u304c\u304a\"));\r\n        \/\/ \u6307\u5b9a\u306e\u30ad\u30fc\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u691c\u7d22\r\n        System.out.println(map.containsKey(\"Rose\")); \/\/ \u7d50\u679c : true\r\n        \/\/ \u6307\u5b9a\u306e\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u691c\u7d22\r\n        System.out.println(map.containsValue(\"\u30d0\u30e9\")); \/\/ \u7d50\u679c : true\r\n        \/\/ \u30de\u30c3\u30d7\u306e\u4e2d\u8eab\u304c\u7a7a\u304b\u3092\u691c\u7d22\r\n        System.out.println(map.isEmpty()); \/\/ \u7d50\u679c : false\r\n\r\n        \/\/ \u3059\u3079\u3066\u306e\u30ad\u30fc\u3092\u53d6\u5f97\r\n        for (var key : map.keySet()) {\r\n            System.out.println(key); \/\/ \u7d50\u679c : Rose, Sunflower, Morning Glory\r\n        }\r\n        \/\/ \u3059\u3079\u3066\u306e\u5024\u3092\u53d6\u5f97\r\n        for (var value : map.values()) {\r\n            System.out.println(value); \/\/ \u7d50\u679c : \u30d0\u30e9\u3001\u3072\u307e\u308f\u308a\u3001\u3042\u3055\u304c\u304a\r\n        }\r\n        \/\/ \u6307\u5b9a\u306e\u30ad\u30fc\u306e\u5024\u3092value\u306b\u7f6e\u304d\u63db\u3048\r\n        map.replace(\"Rose\", \"\u8594\u8587\");\r\n        \/\/ \u6307\u5b9a\u306e\u30ad\u30fckey\/\u5024old\u304c\u3042\u308b\u5834\u5408\u3001\u305d\u306e\u5024\u3092new\u306b\u7f6e\u304d\u63db\u3048\r\n        map.replace(\"Sunflower\", \"\u3072\u307e\u308f\u308a\", \"\u5411\u65e5\u8475\");\r\n\r\n        for (var entry : map.entrySet()) {\r\n            System.out.println(entry.getKey() + \":\" + entry.getValue());\r\n            \/\/ \/\/ \u7d50\u679c : Rose:\u8594\u8587\u3001 Sunflower:\u5411\u65e5\u8475\u3001 Morning Glory:\u3042\u3055\u304c\u304a\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>true\r\ntrue\r\nfalse\r\nRose\r\nSunflower\r\nMorning Glory\r\n\u30d0\u30e9\r\n\u3072\u307e\u308f\u308a\r\n\u3042\u3055\u304c\u304a\r\nRose:\u8594\u8587\r\nSunflower:\u5411\u65e5\u8475\r\nMorning Glory:\u3042\u3055\u304c\u304a\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u5730\u56fe\u4e0d\u80fd\u76f4\u63a5\u4f20\u9012\u7ed9\u6269\u5c55for\u547d\u4ee4\u3002\u8981\u679a\u4e3e\u952e\/\u503c\uff0c\u8bf7\u4f7f\u7528keySet\/values\u65b9\u6cd5\u6765\u83b7\u53d6\u952e\/\u503c\u7684\u96c6\u5408\u3002<br \/>\n\u6216\u8005\uff0c\u60a8\u4e5f\u53ef\u4ee5\u4f7f\u7528entrySet\u65b9\u6cd5\u6765\u83b7\u53d6\u5730\u56fe\u6761\u76ee(Map.Entry)\u7684\u96c6\u5408\u3002<br \/>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7entry.getKey\/entry.getValue\u65b9\u6cd5\u8bbf\u95ee\u952e\/\u503c\u3002<\/p>\n<h2>\u6dfb\u52a0\u6570\u503c\u5e76\u5728\u65e5\u5fd7\u4e2d\u8fdb\u884c\u83b7\u53d6\u7684\u793a\u4f8b<\/h2>\n<p>\u4e3b\u8981\u662fJava\u6587\u4ef6<\/p>\n<pre class=\"post-pre\"><code>package com.company;\r\n\r\nimport java.util.HashMap;\r\n\r\npublic class Main {\r\n    public static void main(String[] args) {\r\n        var key1 = Integer.valueOf(1);\r\n        var key2 = Integer.valueOf(2);\r\n        var key3 = Integer.valueOf(3);\r\n        var key4 = Integer.valueOf(4);\r\n\r\n        var data = new HashMap&lt;Integer, String&gt;() {\r\n            {\r\n                \/\/ pub(K key, V value) \u6307\u5b9a\u306e\u30ad\u30fc\/\u5024\u306e\u8981\u7d20\u3092\u8ffd\u52a0\r\n                put(key1, \"Apple\");\r\n                put(key2, \"Google\");\r\n                put(key3, \"FaceBook\");\r\n                put(key4, \"Amazon\");\r\n            }\r\n        };\r\n        System.out.println(data.get(key1)); \/\/ \u6307\u5b9a\u306e\u30ad\u30fc\u306e\u5024\u3092\u53d6\u5f97\r\n        System.out.println(data.getOrDefault(key2, \"Google\")); \/\/ \u6307\u5b9a\u306e\u30ad\u30fc\u306e\u5024\u3092\u53d6\u5f97\r\n        System.out.println(data.entrySet()); \/\/ \u3059\u3079\u3066\u8981\u7d20\u3092\u53d6\u5f97\r\n        System.out.println(data.keySet()); \/\/ \u3059\u3079\u3066\u306e\u30ad\u30fc\u3092\u53d6\u5f97\r\n        System.out.println(data.size()); \/\/ \u30de\u30c3\u30d7\u306e\u8981\u7d20\u6570\u3092\u53d6\u5f97\r\n        System.out.println(data.values()); \/\/ \u3059\u3079\u3066\u306e\u5024\u3092\u53d6\u5f97\r\n    }\r\n}\r\n\r\n<\/code><\/pre>\n<p>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>Apple\r\nGoogle\r\n[1=Apple, 2=Google, 3=FaceBook, 4=Amazon]\r\n[1, 2, 3, 4]\r\n4\r\n[Apple, Google, FaceBook, Amazon]\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5730\u56fe \u5730\u56fe\u662f\u4e00\u79cd\u4ee5\u552f\u4e00\u952e\u548c\u503c\u5bf9\u8fdb\u884c\u7ba1\u7406\u7684\u6570\u636e\u7ed3\u6784\u3002\u6839\u636e\u4e0d\u540c\u7684\u8bed\u8a00\uff0c\u5b83\u88ab\u79f0\u4e3a\u5b57\u5178\u3001\u54c8\u5e0c\u6216\u5173\u8054\u6570\u7ec4\u3002 \u952e\u662f\u5730\u56fe\u7684\u4e00 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31059","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"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 \u7684 Map \u662f\u4ec0\u4e48\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava \u7684 Map \u662f\u4ec0\u4e48\uff1f\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u7684-map-\u662f\u4ec0\u4e48\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" 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