{"id":91,"date":"2023-11-16T21:24:11","date_gmt":"2024-01-30T17:33:22","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e5%88%9b%e5%bb%ba%e4%b8%80%e4%b8%aa%e4%b8%8d%e5%8f%af%e5%8f%98%e7%b1%bb\/"},"modified":"2025-07-31T22:44:42","modified_gmt":"2025-07-31T14:44:42","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e5%88%9b%e5%bb%ba%e4%b8%80%e4%b8%aa%e4%b8%8d%e5%8f%af%e5%8f%98%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8java%e4%b8%ad%e5%88%9b%e5%bb%ba%e4%b8%80%e4%b8%aa%e4%b8%8d%e5%8f%af%e5%8f%98%e7%b1%bb\/","title":{"rendered":"Java\u4e2d\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b\uff1a\u7ec8\u6781\u6307\u5357\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"<h3>\u7b80\u4ecb\uff1aJava\u4e2d\u5982\u4f55\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b<\/h3>\n<p>\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8\u5982\u4f55\u5728Java\u7f16\u7a0b\u4e2d\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7c7b\u3002<\/p>\n<p>\u5f53\u4e00\u4e2a\u5bf9\u8c61\u5728\u521d\u59cb\u5316\u540e\u5176\u72b6\u6001\u65e0\u6cd5\u88ab\u4fee\u6539\u65f6\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a\u4e0d\u53ef\u53d8\u5bf9\u8c61\u3002\u4f8b\u5982\uff0cJava\u4e2d\u7684<code>String<\/code>\u7c7b\u5c31\u662f\u4e00\u4e2a\u5178\u578b\u7684\u4e0d\u53ef\u53d8\u7c7b\u3002\u4e00\u65e6<code>String<\/code>\u5bf9\u8c61\u88ab\u521b\u5efa\uff0c\u5176\u5185\u90e8\u7684\u503c\u5c31\u4e0d\u80fd\u518d\u6539\u53d8\u3002\u5982\u679c\u60a8\u60f3\u4e86\u89e3\u66f4\u591a\u5173\u4e8e<a href=\"#\" title=\"\u4e3a\u4ec0\u4e48Java\u4e2d\u7684String\u7c7b\u662f\u4e0d\u53ef\u53d8\u7684\">\u4e3a\u4ec0\u4e48Java\u4e2d\u7684String\u7c7b\u662f\u4e0d\u53ef\u53d8\u7684<\/a>\uff0c\u53ef\u4ee5\u70b9\u51fb\u67e5\u770b\u3002<\/p>\n<p>\u7531\u4e8e\u4e0d\u53ef\u53d8\u5bf9\u8c61\u4e00\u65e6\u521b\u5efa\u5c31\u65e0\u6cd5\u66f4\u65b0\uff0c\u7a0b\u5e8f\u5728\u9700\u8981\u6539\u53d8\u5176\u201c\u72b6\u6001\u201d\u65f6\uff0c\u5fc5\u987b\u521b\u5efa\u4e00\u4e2a\u5168\u65b0\u7684\u5bf9\u8c61\u3002\u5c3d\u7ba1\u5982\u6b64\uff0c\u4e0d\u53ef\u53d8\u5bf9\u8c61\u4f9d\u7136\u5177\u6709\u663e\u8457\u7684\u4f18\u52bf\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u4e0d\u53ef\u53d8\u7c7b\u975e\u5e38\u9002\u5408\u7528\u4e8e\u7f13\u5b58\uff0c\u56e0\u4e3a\u60a8\u65e0\u9700\u62c5\u5fc3\u5176\u503c\u7684\u610f\u5916\u6539\u53d8\u3002<\/li>\n<li>\u4e0d\u53ef\u53d8\u7c7b\u5929\u751f\u5c31\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u8fd9\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u7701\u53bb\u4e86\u5904\u7406\u7ebf\u7a0b\u540c\u6b65\u7684\u590d\u6742\u6027\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c\u60a8\u5bf9Java\u591a\u7ebf\u7a0b\u611f\u5174\u8da3\uff0c\u53ef\u4ee5<a href=\"#\" title=\"\u4e86\u89e3Java\u4e2d\u7684\u591a\u7ebf\u7a0b\">\u4e86\u89e3\u66f4\u591aJava\u591a\u7ebf\u7a0b\u77e5\u8bc6<\/a>\uff0c\u5e76\u6d4f\u89c8<a href=\"#\" title=\"Java\u591a\u7ebf\u7a0b\u9762\u8bd5\u95ee\u9898\">Java\u591a\u7ebf\u7a0b\u9762\u8bd5\u5e38\u89c1\u95ee\u9898<\/a>\u3002<\/p>\n<h2>\u5728Java\u4e2d\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b\u7684\u539f\u5219<\/h2>\n<p>\u8981\u5728Java\u4e2d\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7c7b\uff0c\u60a8\u9700\u8981\u9075\u5faa\u4ee5\u4e0b\u6838\u5fc3\u539f\u5219\uff1a<\/p>\n<ol>\n<li>\u5c06\u7c7b\u58f0\u660e\u4e3a<code>final<\/code>\uff0c\u4ee5\u9632\u6b62\u5176\u88ab\u7ee7\u627f\u548c\u4fee\u6539\u884c\u4e3a\u3002<\/li>\n<li>\u5c06\u6240\u6709\u7684\u5b57\u6bb5\uff08\u6210\u5458\u53d8\u91cf\uff09\u58f0\u660e\u4e3a<code>private<\/code>\uff0c\u4ee5\u9632\u6b62\u5916\u90e8\u76f4\u63a5\u8bbf\u95ee\u548c\u4fee\u6539\u3002<\/li>\n<li>\u4e0d\u63d0\u4f9b\u4efb\u4f55\u4fee\u6539\u53d8\u91cf\u7684<code>setter<\/code>\u65b9\u6cd5\u3002<\/li>\n<li>\u5c06\u6240\u6709\u53ef\u53d8\u5b57\u6bb5\u58f0\u660e\u4e3a<code>final<\/code>\uff0c\u4ee5\u786e\u4fdd\u5b83\u4eec\u7684\u503c\u53ea\u80fd\u88ab\u8d4b\u503c\u4e00\u6b21\u3002<\/li>\n<li>\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\uff0c\u5bf9\u6240\u6709\u53ef\u53d8\u5bf9\u8c61\u5b57\u6bb5\u6267\u884c\u6df1\u62f7\u8d1d\uff08deep copy\uff09\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u5f15\u7528\u5916\u90e8\u5bf9\u8c61\u3002<\/li>\n<li>\u5728<code>getter<\/code>\u65b9\u6cd5\u4e2d\uff0c\u5bf9\u4e8e\u8fd4\u56de\u53ef\u53d8\u5bf9\u8c61\u5b57\u6bb5\u65f6\uff0c\u5e94\u8fd4\u56de\u5176\u526f\u672c\uff08\u514b\u9686\u5bf9\u8c61\uff09\uff0c\u800c\u4e0d\u662f\u5b9e\u9645\u7684\u5bf9\u8c61\u5f15\u7528\uff0c\u4ee5\u9632\u6b62\u5916\u90e8\u4fee\u6539\u5185\u90e8\u72b6\u6001\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u7c7b\uff0c\u65e8\u5728\u8bf4\u660e\u4e0d\u53ef\u53d8\u6027\u7684\u57fa\u672c\u6982\u5ff5\u3002<code>FinalClassExample<\/code>\u7c7b\u5b9a\u4e49\u4e86\u5b57\u6bb5\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4f7f\u7528\u6df1\u62f7\u8d1d\u6765\u521d\u59cb\u5316\u5bf9\u8c61\u7684\u6784\u9020\u65b9\u6cd5\u3002<code>FinalClassExample.java<\/code>\u6587\u4ef6\u4e2d\u7684<code>main<\/code>\u65b9\u6cd5\u5c06\u7528\u4e8e\u6d4b\u8bd5\u5bf9\u8c61\u7684\u4e0d\u53ef\u53d8\u6027\u3002<\/p>\n<p>\u8bf7\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a<code>FinalClassExample.java<\/code>\u7684\u65b0\u6587\u4ef6\uff0c\u5e76\u590d\u5236\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre><code>\/\/ FinalClassExample.java \u6700\u7ec8\u7c7b\u793a\u4f8b\r\n\/\/ ... (\u6b64\u5904\u5c06\u662fJava\u4ee3\u7801\u5185\u5bb9)<\/code><\/pre>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728Java\u4e2d\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7c7b\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51715\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><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\">Iterator<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FinalClassExample<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ FinalClassExample \u7c7b\u7684\u5b57\u6bb5<\/span>\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <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=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> testMap<span class=\"token punctuation\">;<\/span>\r\n\r\n\t\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ \u53ef\u53d8\u5bf9\u8c61\u7684 Getter \u65b9\u6cd5<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <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> <span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><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><span class=\"token punctuation\">)<\/span> testMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">clone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ \u6267\u884c\u6df1\u62f7\u8d1d\u7684\u6784\u9020\u65b9\u6cd5<\/span>\r\n\t\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> n<span class=\"token punctuation\">,<\/span> <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> hm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span>\r\n\t\t<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><span class=\"token string\">\"\u6b63\u5728\u4e3a\u5bf9\u8c61\u521d\u59cb\u5316\u6267\u884c\u6df1\u62f7\u8d1d\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t\t<span class=\"token comment\">\/\/ \"this\" \u5173\u952e\u5b57\u6307\u5411\u5f53\u524d\u5bf9\u8c61<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id<span class=\"token operator\">=<\/span>i<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name<span class=\"token operator\">=<\/span>n<span class=\"token punctuation\">;<\/span>\r\n\r\n\t\t<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> tempMap<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\">String<\/span><span class=\"token punctuation\">,<\/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\t\t<span class=\"token class-name\">String<\/span> key<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">Iterator<\/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> it <span class=\"token operator\">=<\/span> hm<span class=\"token punctuation\">.<\/span><span class=\"token function\">keySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><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\">;<\/span>\r\n\t\t<span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>it<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\">{<\/span>\r\n\t\t\tkey<span class=\"token operator\">=<\/span>it<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\">;<\/span>\r\n\t\t\ttempMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> hm<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token punctuation\">}<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>testMap<span class=\"token operator\">=<\/span>tempMap<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ \u6d4b\u8bd5\u4e0d\u53ef\u53d8\u7c7b<\/span>\r\n\r\n\t<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\t\t<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> h1 <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\">String<\/span><span class=\"token punctuation\">,<\/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\t\th1<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\">\"\u7b2c\u4e00\u4e2a\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<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\">\"\u7b2c\u4e8c\u4e2a\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">String<\/span> s <span class=\"token operator\">=<\/span> <span class=\"token string\">\"\u539f\u59cb\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token keyword\">int<\/span> i<span class=\"token operator\">=<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">FinalClassExample<\/span> ce <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span>s<span class=\"token punctuation\">,<\/span>h1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token comment\">\/\/ \u6253\u5370 ce \u7684\u503c<\/span>\r\n\t\t<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><span class=\"token string\">\"ce id: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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><span class=\"token string\">\"ce name: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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><span class=\"token string\">\"ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ \u6539\u53d8\u5c40\u90e8\u53d8\u91cf\u7684\u503c<\/span>\r\n\t\ti<span class=\"token operator\">=<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\ts<span class=\"token operator\">=<\/span><span class=\"token string\">\"\u5df2\u4fee\u6539\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"3\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"\u7b2c\u4e09\u4e2a\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ \u518d\u6b21\u6253\u5370\u503c<\/span>\r\n\t\t<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><span class=\"token string\">\"\u5c40\u90e8\u53d8\u91cf\u6539\u53d8\u540e ce id: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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><span class=\"token string\">\"\u5c40\u90e8\u53d8\u91cf\u6539\u53d8\u540e ce name: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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 string\">\"\u5c40\u90e8\u53d8\u91cf\u6539\u53d8\u540e ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<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> hmTest <span class=\"token operator\">=<\/span> ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\thmTest<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\">\"\u65b0\u7684\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<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><span class=\"token string\">\"\u901a\u8fc7 getter \u65b9\u6cd5\u6539\u53d8\u53d8\u91cf\u540e ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u7f16\u8bd1\u5e76\u8fd0\u884c\u7a0b\u5e8f\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\">javac FinalClassExample.java<\/li>\n<li data-prefix=\"$\"><span class=\"token function\">java<\/span> FinalClassExample<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"post-conf-note\">\n<p class=\"post-conf-desc\">\u6ce8\u610f<\/p>\n<\/div>\n<div>\n<p>\u6ce8\u610f\uff1a\u7f16\u8bd1\u6587\u4ef6\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u4ee5\u4e0b\u6d88\u606f\uff1a<\/p>\n<p>\u6ce8\u610f\uff1aFinalClassExample.java\u4f7f\u7528\u4e86\u672a\u7ecf\u68c0\u67e5\u6216\u4e0d\u5b89\u5168\u7684\u64cd\u4f5c\uff0c\u56e0\u4e3agetter\u65b9\u6cd5\u5c06<code>HashMap&lt;String, String&gt;<\/code>\u5f3a\u5236\u8f6c\u6362\u4e3a<code>Object<\/code>\u65f6\u8fdb\u884c\u4e86\u672a\u7ecf\u68c0\u67e5\u7684\u8f6c\u6362\u3002\u4f60\u53ef\u4ee5\u5ffd\u7565\u7f16\u8bd1\u5668\u8b66\u544a\uff0c\u4ec5\u4f9b\u672c\u4f8b\u4f7f\u7528\u3002<\/p>\n<p>\u4f60\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Performing Deep Copy for Object initialization\r\nce id: 10\r\nce name: original\r\nce testMap: {1=first, 2=second}\r\nce id after local variable change: 10\r\nce name after local variable change: original\r\nce testMap after local variable change: {1=first, 2=second}\r\nce testMap after changing variable from getter methods: {1=first, 2=second}<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\u663e\u793a<code>HashMap<\/code>\u7684\u503c\u6ca1\u6709\u6539\u53d8\uff0c\u8fd9\u662f\u56e0\u4e3a\u6784\u9020\u51fd\u6570\u4f7f\u7528\u4e86\u6df1\u62f7\u8d1d\uff0c\u5e76\u4e14getter\u51fd\u6570\u8fd4\u56de\u539f\u59cb\u5bf9\u8c61\u7684\u514b\u9686\u4f53\u3002<\/p>\n<h2>\u5f53\u4f60\u4e0d\u4f7f\u7528\u6df1\u62f7\u8d1d\u548c\u514b\u9686\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u4f60\u53ef\u4ee5\u5bf9<code>FinalClassExample.java<\/code>\u6587\u4ef6\u8fdb\u884c\u66f4\u6539\uff0c\u4ee5\u5c55\u793a\u5728\u4f7f\u7528\u6d45\u62f7\u8d1d\u800c\u4e0d\u662f\u6df1\u62f7\u8d1d\u5e76\u8fd4\u56de\u5bf9\u8c61\u800c\u4e0d\u662f\u526f\u672c\u65f6\u4f1a\u53d1\u751f\u7684\u60c5\u51b5\u3002\u5bf9\u8c61\u5c06\u4e0d\u518d\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5e76\u4e14\u53ef\u4ee5\u88ab\u66f4\u6539\u3002\u5bf9\u793a\u4f8b\u6587\u4ef6\u8fdb\u884c\u4ee5\u4e0b\u66f4\u6539\uff08\u6216\u4ece\u4ee3\u7801\u793a\u4f8b\u4e2d\u590d\u5236\u7c98\u8d34\uff09\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u5220\u9664\u63d0\u4f9b\u6df1\u62f7\u8d1d\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5e76\u6dfb\u52a0\u4ee5\u4e0b\u793a\u4f8b\u4e2d\u7a81\u51fa\u663e\u793a\u7684\u63d0\u4f9b\u6d45\u62f7\u8d1d\u7684\u6784\u9020\u65b9\u6cd5\u3002<\/li>\n<li>\u5728getter\u51fd\u6570\u4e2d\uff0c\u5220\u9664<code>return (HashMap&lt;String, String&gt;) testMap.clone();<\/code>\u5e76\u6dfb\u52a0<code>return testMap;<\/code>\u3002<\/li>\n<\/ul>\n<p>\u73b0\u5728\u793a\u4f8b\u6587\u4ef6\u5e94\u8be5\u50cf\u8fd9\u6837\uff1a<\/p>\n<div>\u7ec8\u6001\u793a\u4f8b\u7c7b.java<\/div>\n<\/div>\n<pre class=\"post-pre\"><code><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\">Iterator<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FinalClassExample<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ FinalClassExample \u7c7b\u7684\u5b57\u6bb5<\/span>\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <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> testMap<span class=\"token punctuation\">;<\/span>\r\n\r\n\t\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ \u53ef\u53d8\u5bf9\u8c61\u7684 Getter \u65b9\u6cd5<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <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> <span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<mark><span class=\"token keyword\">return<\/span> testMap<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<mark><span class=\"token comment\">\/\/ \u6267\u884c\u6d45\u62f7\u8d1d\u7684\u6784\u9020\u65b9\u6cd5<\/span><\/mark>\r\n\r\n\t<mark><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> n<span class=\"token punctuation\">,<\/span> <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> hm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><\/mark>\r\n\t\t<mark><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><span class=\"token string\">\"\u6b63\u5728\u4e3a\u5bf9\u8c61\u521d\u59cb\u5316\u6267\u884c\u6d45\u62f7\u8d1d\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/mark>\r\n\t\t<mark><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id<span class=\"token operator\">=<\/span>i<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t\t<mark><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name<span class=\"token operator\">=<\/span>n<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t\t<mark><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>testMap<span class=\"token operator\">=<\/span>hm<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t<mark><span class=\"token punctuation\">}<\/span><\/mark>\r\n\r\n\t<span class=\"token comment\">\/\/ \u6d4b\u8bd5\u4e0d\u53ef\u53d8\u7c7b<\/span>\r\n\r\n\t<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\t\t<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> h1 <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\">String<\/span><span class=\"token punctuation\">,<\/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\t\th1<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\">\"first\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<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\">\"second\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">String<\/span> s <span class=\"token operator\">=<\/span> <span class=\"token string\">\"original\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token keyword\">int<\/span> i<span class=\"token operator\">=<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">FinalClassExample<\/span> ce <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span>s<span class=\"token punctuation\">,<\/span>h1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token comment\">\/\/ \u6253\u5370 ce \u7684\u503c<\/span>\r\n\t\t<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><span class=\"token string\">\"ce id: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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><span class=\"token string\">\"ce name: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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><span class=\"token string\">\"ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ \u6539\u53d8\u5c40\u90e8\u53d8\u91cf\u7684\u503c<\/span>\r\n\t\ti<span class=\"token operator\">=<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\ts<span class=\"token operator\">=<\/span><span class=\"token string\">\"modified\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"3\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"third\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ \u518d\u6b21\u6253\u5370\u503c<\/span>\r\n\t\t<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><span class=\"token string\">\"\u5c40\u90e8\u53d8\u91cf\u6539\u53d8\u540e ce id: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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><span class=\"token string\">\"\u5c40\u90e8\u53d8\u91cf\u6539\u53d8\u540e ce name: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<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><span class=\"token string\">\"\u5c40\u90e8\u53d8\u91cf\u6539\u53d8\u540e ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<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> hmTest <span class=\"token operator\">=<\/span> ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\thmTest<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\">\"new\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<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><span class=\"token string\">\"\u901a\u8fc7 getter \u65b9\u6cd5\u6539\u53d8\u53d8\u91cf\u540e ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u7f16\u8bd1\u5e76\u8fd0\u884c\u7a0b\u5e8f\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\">javac FinalClassExample.java<\/li>\n<li data-prefix=\"$\"><span class=\"token function\">java<\/span> FinalClassExample<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u4f60\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u6267\u884c\u5bf9\u8c61\u7684\u6d45\u62f7\u8d1d\u521d\u59cb\u5316<\/p>\n<p>ce id: 10<\/p>\n<p>ce name: original<\/p>\n<p>ce testMap: {1=first, 2=second}<\/p>\n<p>ce id after local variable change: 10<\/p>\n<p>ce name after local variable change: original<\/p>\n<p>ce testMap after local variable change: {1=first, 2=second, 3=third}<\/p>\n<p>ce testMap after changing variable from getter methods: {1=first, 2=second, 3=third, 4=new}<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u8f93\u51fa\u663e\u793aHashMap\u7684\u503c\u5df2\u7ecf\u88ab\u66f4\u6539\uff0c\u56e0\u4e3a\u6784\u9020\u65b9\u6cd5\u4f7f\u7528\u4e86\u6d45\u62f7\u8d1d\uff0c\u5728getter\u51fd\u6570\u4e2d\u76f4\u63a5\u5f15\u7528\u4e86\u539f\u59cb\u5bf9\u8c61\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5728\u521b\u5efaJava\u4e2d\u7684\u4e0d\u53ef\u53d8\u7c7b\u65f6\uff0c\u60a8\u5df2\u7ecf\u5b66\u5230\u4e86\u4e00\u4e9b\u8981\u9075\u5faa\u7684\u4e00\u822c\u539f\u5219\uff0c\u5305\u62ec\u6df1\u62f7\u8d1d\u7684\u91cd\u8981\u6027\u3002\u63a5\u4e0b\u6765\uff0c\u8bf7\u7ee7\u7eed\u5b66\u4e60\u66f4\u591a\u7684Java\u6559\u7a0b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u4ecb\uff1aJava\u4e2d\u5982\u4f55\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b \u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8\u5982\u4f55\u5728Java\u7f16\u7a0b\u4e2d\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7c7b\u3002 \u5f53\u4e00\u4e2a\u5bf9\u8c61\u5728\u521d\u59cb\u5316\u540e\u5176 [&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":[485,189,484,259,486],"class_list":["post-91","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-immutable-class","tag-java","tag-484","tag-259","tag-486"],"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\u4e2d\u521b\u5efa\u4e0d\u53ef\u53d8\u7c7b\uff1a\u7ec8\u6781\u6307\u5357\u4e0e\u6700\u4f73\u5b9e\u8df5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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