{"id":31195,"date":"2023-07-28T11:52:24","date_gmt":"2022-09-15T05:12:45","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e5%88%9b%e5%bb%ba%e4%ba%8c%e7%bb%b4%e5%85%b3%e8%81%94%e6%95%b0%e7%bb%84\/"},"modified":"2025-08-12T22:47:09","modified_gmt":"2025-08-12T14:47:09","slug":"%e3%80%90java%e3%80%91%e5%88%9b%e5%bb%ba%e4%ba%8c%e7%bb%b4%e5%85%b3%e8%81%94%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e5%88%9b%e5%bb%ba%e4%ba%8c%e7%bb%b4%e5%85%b3%e8%81%94%e6%95%b0%e7%bb%84\/","title":{"rendered":"\u3010Java\u3011\u521b\u5efa\u4e8c\u7ef4\u5173\u8054\u6570\u7ec4"},"content":{"rendered":"<p>\u5982\u679c\u6709\u5176\u4ed6\u4eba\u77e5\u9053\u4e8c\u7ef4\u5173\u8054\u6570\u7ec4\u7684\u5b9e\u73b0\u65b9\u6cd5\uff0c\u8bf7\u8bb2\u89e3\u7ed9\u6211\u542c\u3002<\/p>\n<h1>\u4ee3\u7801 (Mandarin Chinese: &#8220;&#8221;)<\/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<span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/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=\"o\">{<\/span>\r\n        <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Integer<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">Object<\/span><span class=\"o\">&gt;&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\">Integer<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span><span class=\"nc\">Object<\/span><span class=\"o\">&gt;&gt;();<\/span>\r\n        <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/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\">Object<\/span><span class=\"o\">&gt;());<\/span>\r\n        <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">).<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u540d\u524d\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u7530\u4e2d\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">).<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u56fd\u8a9e\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">33<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">).<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u6570\u5b66\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">10<\/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=\"mi\">2<\/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\">Object<\/span><span class=\"o\">&gt;());<\/span>\r\n        <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">2<\/span><span class=\"o\">).<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u540d\u524d\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">2<\/span><span class=\"o\">).<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u56fd\u8a9e\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">63<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">2<\/span><span class=\"o\">).<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u6570\u5b66\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">62<\/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=\"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<h1>\u7ed3\u5c40<\/p>\n<pre class=\"post-pre\"><code>{1={\u540d\u524d=\u7530\u4e2d, \u56fd\u8a9e=33, \u6570\u5b66=10}, 2={\u540d\u524d=\u9ad8\u6a4b, \u56fd\u8a9e=63, \u6570\u5b66=62}}\r\n\r\n<\/code><\/pre>\n<h1>\u7f16\u7801<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.*<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Map2d<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Integer<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Object<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Map2d<\/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=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u540d\u524d\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u7530\u4e2d\"<\/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=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u56fd\u8a9e\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">33<\/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=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u6570\u5b66\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">10<\/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=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u540d\u524d\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/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=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u56fd\u8a9e\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">63<\/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=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u6570\u5b66\"<\/span><span class=\"o\">,<\/span> <span class=\"mi\">62<\/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\">map<\/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\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u6570\u5b66\"<\/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\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u7406\u79d1\"<\/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\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u56fd\u8a9e\"<\/span><span class=\"o\">));<\/span>\r\n    <span class=\"o\">}<\/span>\r\n    \r\n    \r\n    <span class=\"kd\">static<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Map2d<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K1<\/span><span class=\"o\">,<\/span> <span class=\"no\">K2<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">K2<\/span><span class=\"o\">,<\/span><span class=\"no\">V<\/span><span class=\"o\">&gt;&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;&gt;();<\/span>\r\n    \r\n        <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">put<\/span><span class=\"o\">(<\/span><span class=\"no\">K1<\/span> <span class=\"n\">k1<\/span><span class=\"o\">,<\/span> <span class=\"no\">K2<\/span> <span class=\"n\">k2<\/span><span class=\"o\">,<\/span> <span class=\"no\">V<\/span> <span class=\"n\">v<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">computeIfAbsent<\/span><span class=\"o\">(<\/span><span class=\"n\">k1<\/span><span class=\"o\">,<\/span> <span class=\"n\">k<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">HashMap<\/span><span class=\"o\">&lt;&gt;()).<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"n\">k2<\/span><span class=\"o\">,<\/span> <span class=\"n\">v<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    \r\n        <span class=\"kd\">public<\/span> <span class=\"no\">V<\/span> <span class=\"nf\">get<\/span><span class=\"o\">(<\/span><span class=\"no\">K1<\/span> <span class=\"n\">k1<\/span><span class=\"o\">,<\/span> <span class=\"no\">K2<\/span> <span class=\"n\">k2<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"nc\">Optional<\/span><span class=\"o\">.<\/span><span class=\"na\">ofNullable<\/span><span class=\"o\">(<\/span><span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"n\">k1<\/span><span class=\"o\">))<\/span>\r\n                <span class=\"o\">.<\/span><span class=\"na\">map<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"n\">k2<\/span><span class=\"o\">))<\/span>\r\n                <span class=\"o\">.<\/span><span class=\"na\">orElse<\/span><span class=\"o\">(<\/span><span class=\"kc\">null<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    \r\n        <span class=\"nd\">@Override<\/span>\r\n        <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">toString<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"n\">map<\/span><span class=\"o\">.<\/span><span class=\"na\">toString<\/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\r\n<\/code><\/pre>\n<h1>\u7ed3\u679c &#8211;<\/p>\n<pre class=\"post-pre\"><code>{1={\u540d\u524d=\u7530\u4e2d, \u56fd\u8a9e=33, \u6570\u5b66=10}, 2={\u540d\u524d=\u9ad8\u6a4b, \u56fd\u8a9e=63, \u6570\u5b66=62}}\r\n10\r\nnull\r\nnull\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u679c\u6709\u5176\u4ed6\u4eba\u77e5\u9053\u4e8c\u7ef4\u5173\u8054\u6570\u7ec4\u7684\u5b9e\u73b0\u65b9\u6cd5\uff0c\u8bf7\u8bb2\u89e3\u7ed9\u6211\u542c\u3002 \u4ee3\u7801 (Mandarin Chinese: &#038;#822 [&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-31195","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) - 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