{"id":89338,"date":"2026-08-02T21:32:30","date_gmt":"2026-08-02T13:32:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/89338.html"},"modified":"2026-08-02T21:32:30","modified_gmt":"2026-08-02T13:32:30","slug":"%e9%98%bf%e9%87%8c%e9%9d%a2%e8%af%95%e5%ae%98%e5%bf%85%e9%97%ae%ef%bc%9astring%e3%80%81stringbuilder%e3%80%81stringbuffer-%e4%b8%89%e8%80%85%e5%8c%ba%e5%88%ab%ef%bc%9f90%e7%a8%8b%e5%ba%8f%e5%91%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/89338.html","title":{"rendered":"\u963f\u91cc\u9762\u8bd5\u5b98\u5fc5\u95ee\uff1aString\u3001StringBuilder\u3001StringBuffer \u4e09\u8005\u533a\u522b\uff1f90%\u7a0b\u5e8f\u5458\u7b54\u4e0d\u5230\u5e95\u5c42\u672c\u8d28\uff01"},"content":{"rendered":"<h2>\u963f\u91cc\u9762\u8bd5\u5b98\u5fc5\u95ee&#xff1a;String\u3001StringBuilder\u3001StringBuffer \u4e09\u8005\u533a\u522b&#xff1f;90%\u7a0b\u5e8f\u5458\u7b54\u4e0d\u5230\u5e95\u5c42\u672c\u8d28&#xff01;<\/h2>\n<h3>\u524d\u8a00<\/h3>\n<p>Java \u57fa\u7840\u5fc5\u95ee\u9ad8\u9891\u539f\u9898&#xff1a;String\u3001StringBuilder\u3001StringBuffer \u7684\u533a\u522b\u3002<\/p>\n<p>\u5f88\u591a\u4eba\u53ea\u4f1a\u80cc\u4e00\u53e5&#xff1a;<br \/>\nString \u4e0d\u53ef\u53d8\u3001\u540e\u4e24\u8005\u53ef\u53d8&#xff1b;Buffer\u7ebf\u7a0b\u5b89\u5168\u3001Builder\u4e0d\u5b89\u5168\u3002<\/p>\n<p>\u4f46\u9762\u8bd5\u5b98\u7ee7\u7eed\u6df1\u6316&#xff1a;<br \/>\n\u4e3a\u4ec0\u4e48 String \u4e0d\u53ef\u53d8&#xff1f;\u5e95\u5c42\u5b58\u50a8\u533a\u522b&#xff1f;\u62fc\u63a5\u6027\u80fd\u5dee\u8ddd\u5230\u5e95\u5728\u54ea&#xff1f;\u4e1a\u52a1\u573a\u666f\u600e\u4e48\u7cbe\u51c6\u9009\u578b&#xff1f;<\/p>\n<p>\u77ac\u95f4\u7ffb\u8f66\u3001\u7b54\u4e0d\u5168\u3001\u62ff\u4e0d\u5230\u6ee1\u5206\u3002<\/p>\n<p>\u672c\u7bc7\u4e00\u6b21\u6027\u8bb2\u900f\u5e95\u5c42\u539f\u7406\u3001\u53ef\u53d8\u6027\u3001\u7ebf\u7a0b\u5b89\u5168\u3001\u6027\u80fd\u3001\u6e90\u7801\u5dee\u5f02\u3001\u771f\u5b9e\u4e1a\u52a1\u9009\u578b&#xff0c;\u770b\u5b8c\u9762\u8bd5\u76f4\u63a5\u6ee1\u5206&#xff01;<\/p>\n<h3>\u4e00\u3001\u6838\u5fc3\u4e00\u53e5\u8bdd\u603b\u7ed3&#xff08;\u9762\u8bd5\u5f00\u7bc7\u5fc5\u6740&#xff09;<\/h3>\n<ul>\n<li>String&#xff1a;\u4e0d\u53ef\u53d8\u5b57\u7b26\u4e32\u3001\u7ebf\u7a0b\u5b89\u5168\u3001\u62fc\u63a5\u6027\u80fd\u5dee<\/li>\n<li>StringBuilder&#xff1a;\u53ef\u53d8\u5b57\u7b26\u4e32\u3001\u7ebf\u7a0b\u4e0d\u5b89\u5168\u3001\u6027\u80fd\u6700\u9ad8&#xff08;\u5355\u7ebf\u7a0b\u9996\u9009&#xff09;<\/li>\n<li>StringBuffer&#xff1a;\u53ef\u53d8\u5b57\u7b26\u4e32\u3001\u7ebf\u7a0b\u5b89\u5168\u3001\u6027\u80fd\u4f4e&#xff08;\u591a\u7ebf\u7a0b\u65e7\u65b9\u6848&#xff09;<\/li>\n<\/ul>\n<h3>\u4e8c\u3001\u5e95\u5c42\u672c\u8d28\u533a\u522b&#xff08;\u91cd\u4e2d\u4e4b\u91cd&#xff09;<\/h3>\n<h4>1. String&#xff08;\u4e0d\u53ef\u53d8&#xff09;<\/h4>\n<p>\u5e95\u5c42&#xff1a;private final char[] \/ byte[] value<br \/>\n\u4e00\u65e6\u521b\u5efa&#xff0c;\u6570\u7ec4\u5185\u5bb9\u4e0d\u53ef\u4fee\u6539\u3002<\/p>\n<p>\u6240\u6709\u5b57\u7b26\u4e32\u62fc\u63a5\u3001\u66ff\u6362\u3001\u622a\u53d6\u4e0d\u4f1a\u4fee\u6539\u539f\u5bf9\u8c61&#xff0c;\u53ea\u4f1a \u65b0\u5efa\u4e00\u4e2a\u65b0 String \u5bf9\u8c61\u3002<br \/>\n\u9891\u7e41\u62fc\u63a5\u4f1a\u4ea7\u751f\u5927\u91cf\u5e9f\u5f03\u5bf9\u8c61\u3001\u6d6a\u8d39\u5185\u5b58\u3001GC\u538b\u529b\u5927\u3002<\/p>\n<h4>2. StringBuilder&#xff08;\u53ef\u53d8&#xff09;<\/h4>\n<p>\u5e95\u5c42&#xff1a;\u975e final \u5b57\u8282\u6570\u7ec4 &#043; \u81ea\u52a8\u6269\u5bb9<br \/>\n\u5bf9\u8c61\u521b\u5efa\u540e&#xff0c;\u76f4\u63a5\u5728\u539f\u6570\u7ec4\u4e0a\u4fee\u6539\u3001\u8ffd\u52a0\u3001\u5220\u9664&#xff0c;\u4e0d\u4ea7\u751f\u65b0\u5bf9\u8c61\u3002<br \/>\n\u6027\u80fd\u6781\u9ad8\u3002<\/p>\n<h4>3. StringBuffer&#xff08;\u53ef\u53d8&#xff09;<\/h4>\n<p>\u5e95\u5c42\u548c StringBuilder \u4e00\u6a21\u4e00\u6837&#xff0c;<br \/>\n\u53ea\u662f\u6240\u6709\u65b9\u6cd5\u52a0\u4e86 synchronized \u9501&#xff0c;\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n<h3>\u4e09\u3001\u4e09\u5927\u7ef4\u5ea6\u5b8c\u6574\u5bf9\u6bd4&#xff08;\u9762\u8bd5\u9ed8\u5199\u8868&#xff09;<\/h3>\n<table>\n<tr>\u5bf9\u6bd4\u9879StringStringBuilderStringBuffer<\/tr>\n<tbody>\n<tr>\n<td>\u53ef\u53d8\u6027<\/td>\n<td>\u4e0d\u53ef\u53d8<\/td>\n<td>\u53ef\u53d8<\/td>\n<td>\u53ef\u53d8<\/td>\n<\/tr>\n<tr>\n<td>\u7ebf\u7a0b\u5b89\u5168<\/td>\n<td>\u5b89\u5168<\/td>\n<td>\u4e0d\u5b89\u5168<\/td>\n<td>\u5b89\u5168&#xff08;synchronized&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u6027\u80fd<\/td>\n<td>\u6781\u4f4e&#xff08;\u9891\u7e41\u521b\u5efa\u65b0\u5bf9\u8c61&#xff09;<\/td>\n<td>\u6700\u9ad8<\/td>\n<td>\u8f83\u4f4e&#xff08;\u9501\u5f00\u9500&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5e95\u5c42\u5b9e\u73b0<\/td>\n<td>final \u6570\u7ec4<\/td>\n<td>\u53ef\u53d8\u52a8\u6001\u6570\u7ec4<\/td>\n<td>\u53ef\u53d8\u52a8\u6001\u6570\u7ec4<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/td>\n<td>\u5c11\u91cf\u5b57\u7b26\u4e32\u3001\u5e38\u91cf\u3001\u56fa\u5b9a\u6587\u672c<\/td>\n<td>\u5355\u7ebf\u7a0b\u5927\u91cf\u62fc\u63a5<\/td>\n<td>\u591a\u7ebf\u7a0b\u62fc\u63a5&#xff08;\u57fa\u672c\u6dd8\u6c70&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u56db\u3001\u4e3a\u4ec0\u4e48 String \u4e0d\u53ef\u53d8&#xff1f;&#xff08;\u9762\u8bd5\u52a0\u5206\u8d85\u7ea7\u91cd\u70b9&#xff09;<\/h3>\n<li>\u5e95\u5c42\u6570\u7ec4\u88ab final \u4fee\u9970&#xff0c;\u5f15\u7528\u4e0d\u53ef\u53d8&#xff1b;<\/li>\n<li>\u5185\u90e8\u6ca1\u6709\u63d0\u4f9b\u4efb\u4f55\u4fee\u6539\u3001\u8ffd\u52a0\u3001\u5220\u9664\u7684\u65b9\u6cd5&#xff1b;<\/li>\n<li>\u4fdd\u8bc1\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u590d\u7528&#xff0c;\u8282\u7701\u5185\u5b58&#xff1b;<\/li>\n<li>\u4fdd\u8bc1\u54c8\u5e0c\u503c\u6052\u5b9a&#xff0c;\u9002\u5408\u505a HashMap key&#xff1b;<\/li>\n<li>\u4fdd\u8bc1\u7ebf\u7a0b\u5929\u7136\u5b89\u5168\u3002<\/li>\n<p>\u91cd\u70b9&#xff1a;String \u7684\u6240\u6709\u4fee\u6539\u90fd\u662f \u65b0\u5efa\u5bf9\u8c61&#xff0c;\u4e0d\u662f\u539f\u5730\u4fee\u6539\u3002<\/p>\n<h3>\u4e94\u3001\u4e3a\u4ec0\u4e48 StringBuilder \u6027\u80fd\u8fdc\u8d85 String&#xff1f;<\/h3>\n<h4>String \u62fc\u63a5\u539f\u7406<\/h4>\n<p><span class=\"token class-name\">String<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;a&#034;<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;b&#034;<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;c&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5faa\u73af\u62fc\u63a5\u4f1a&#xff1a;<br \/>\n\u4ea7\u751f\u5927\u91cf\u4e2d\u95f4 String \u5bf9\u8c61 \u2192 \u5806\u5185\u5b58\u66b4\u6da8 \u2192 \u9891\u7e41GC \u2192 \u6027\u80fd\u6781\u5dee<\/p>\n<h4>StringBuilder \u539f\u7406<\/h4>\n<p>\u5185\u90e8\u81ea\u52a8\u6269\u5bb9&#xff0c;\u5168\u7a0b\u53ea\u6709\u4e00\u4e2a\u5bf9\u8c61&#xff0c;\u76f4\u63a5\u539f\u5730\u8ffd\u52a0\u6570\u636e&#xff0c;\u65e0\u591a\u4f59\u5f00\u9500\u3002<\/p>\n<p>\u5faa\u73af\u62fc\u63a5\u5fc5\u987b\u7528 StringBuilder&#xff01;<\/p>\n<h3>\u516d\u3001StringBuffer \u4e3a\u4ec0\u4e48\u73b0\u5728\u57fa\u672c\u6dd8\u6c70&#xff1f;<\/h3>\n<li>\u4f9d\u9760 synchronized \u91cd\u91cf\u7ea7\u9501&#xff0c;\u5e76\u53d1\u6027\u80fd\u5dee&#xff1b;<\/li>\n<li>\u73b0\u4ee3\u591a\u7ebf\u7a0b\u573a\u666f&#xff0c;\u4e0d\u4f1a\u5171\u7528\u540c\u4e00\u4e2a\u62fc\u63a5\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u591a\u7ebf\u7a0b\u573a\u666f\u4e00\u822c\u81ea\u5df1\u52a0\u9501&#xff0c;\u4e0d\u4f1a\u7528\u81ea\u5e26\u9501&#xff1b;<\/li>\n<li>JDK1.8&#043; \u4f01\u4e1a\u5f00\u53d1\u5b8c\u5168\u63a8\u8350 StringBuilder\u3002<\/li>\n<h3>\u4e03\u3001\u4e1a\u52a1\u573a\u666f\u9009\u578b\u6807\u51c6&#xff08;\u9762\u8bd5\u5b98\u6700\u7231\u95ee&#xff09;<\/h3>\n<h4>1. \u80fd\u7528 String \u7684\u573a\u666f<\/h4>\n<ul>\n<li>\u5b57\u7b26\u4e32\u56fa\u5b9a\u4e0d\u53d8<\/li>\n<li>\u5c11\u91cf\u5b9a\u4e49\u3001\u5e38\u91cf\u3001\u914d\u7f6e\u3001key\u3001\u6587\u672c\u5c55\u793a<\/li>\n<\/ul>\n<h4>2. \u5fc5\u987b\u7528 StringBuilder \u7684\u573a\u666f&#xff08;99%\u4e1a\u52a1&#xff09;<\/h4>\n<ul>\n<li>for \u5faa\u73af\u62fc\u63a5\u5b57\u7b26\u4e32<\/li>\n<li>\u52a8\u6001\u7ec4\u88c5 SQL\u3001JSON\u3001\u65e5\u5fd7\u3001\u62a5\u6587<\/li>\n<li>\u5355\u7ebf\u7a0b\u6240\u6709\u5b57\u7b26\u4e32\u62fc\u63a5\u573a\u666f<\/li>\n<\/ul>\n<h4>3. 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