{"id":64288,"date":"2025-05-03T10:20:04","date_gmt":"2025-05-03T02:20:04","guid":{"rendered":"https:\/\/fwq.ai\/blog\/64288\/"},"modified":"2025-05-03T10:20:04","modified_gmt":"2025-05-03T02:20:04","slug":"java%e4%b8%ad%e5%ad%97%e7%ac%a6%e6%95%b0%e7%bb%84%e6%97%a0%e9%99%90%e9%95%bf%e5%ba%a6%e6%80%8e%e4%b9%88%e5%ae%9a%e4%b9%89-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/64288\/","title":{"rendered":"java\u4e2d\u5b57\u7b26\u6570\u7ec4\u65e0\u9650\u957f\u5ea6\u600e\u4e48\u5b9a\u4e49"},"content":{"rendered":"<blockquote><p>\n  \u65e0\u6cd5\u5728 java \u4e2d\u5b9a\u4e49\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\u4f46\u53ef\u4ee5\u4f7f\u7528 stringbuilder \u7c7b\u5b9e\u73b0\u7c7b\u4f3c\u529f\u80fd\uff1a\u521b\u5efa stringbuilder \u5bf9\u8c61\u3002\u4f7f\u7528 append() \u65b9\u6cd5\u6dfb\u52a0\u5b57\u7b26\u3002\u4f7f\u7528 tostring() \u83b7\u53d6\u5f53\u524d\u5b57\u7b26\u5e8f\u5217\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/03\/2024110303365769678.jpg\" class=\"aligncenter\" title=\"java\u4e2d\u5b57\u7b26\u6570\u7ec4\u65e0\u9650\u957f\u5ea6\u600e\u4e48\u5b9a\u4e49\u63d2\u56fe\" alt=\"java\u4e2d\u5b57\u7b26\u6570\u7ec4\u65e0\u9650\u957f\u5ea6\u600e\u4e48\u5b9a\u4e49\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5728 Java \u4e2d\u5b9a\u4e49\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4<\/strong><\/p>\n<p>\u5728 Java \u4e2d\uff0c\u5b57\u7b26\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u65e0\u6cd5\u52a8\u6001\u6269\u5c55\u3002\u4f46\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 StringBuilder \u7c7b\u6765\u5b9e\u73b0\u7c7b\u4f3c\u4e8e\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\u529f\u80fd\u3002<\/p>\n<p><strong>\u4f7f\u7528 StringBuilder<\/strong><\/p>\n<p>StringBuilder \u662f\u4e00\u4e2a\u53ef\u53d8\u7684\u5b57\u7b26\u5e8f\u5217\uff0c\u5b83\u53ef\u4ee5\u52a8\u6001\u5730\u4fee\u6539\u548c\u6269\u5c55\u3002\u8981\u5b9a\u4e49\u4e00\u4e2a\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u6b65\u9aa4\u64cd\u4f5c\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<ol>\n<li>\n<p><strong>\u521b\u5efa StringBuilder \u5bf9\u8c61\uff1a<\/strong><\/p>\n<pre>StringBuilder sb = new StringBuilder();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<li>\n<p><strong>\u4f7f\u7528 append() \u65b9\u6cd5\u6dfb\u52a0\u5b57\u7b26\uff1a<\/strong><\/p>\n<pre>sb.append('a'); \/\/ \u6dfb\u52a0\u5355\u4e2a\u5b57\u7b26\nsb.append(\"string\"); \/\/ \u6dfb\u52a0\u5b57\u7b26\u4e32<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<li>\n<p><strong>\u968f\u65f6\u83b7\u53d6\u5f53\u524d\u5b57\u7b26\u5e8f\u5217\uff1a<\/strong><\/p>\n<pre>String str = sb.toString();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/li>\n<\/ol>\n<p><strong>\u793a\u4f8b<\/strong><\/p>\n<p>\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u4f7f\u7528 StringBuilder \u5b9e\u73b0\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\uff1a<\/p>\n<pre>StringBuilder sb = new StringBuilder();\nfor (int i = 0; i &lt; 1000000; i++) {\n    sb.append('a');\n}\nString longString = sb.toString();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u6b64\u793a\u4f8b\u5c06\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u4e00\u767e\u4e07\u4e2a\u5b57\u7b26 &#8216;a&#8217; \u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>StringBuilder \u5e76\u4e0d\u662f\u771f\u6b63\u7684\u6570\u7ec4\uff0c\u5b83\u662f\u4e00\u4e2a\u7c7b\uff0c\u7528\u4e8e\u64cd\u7eb5\u53ef\u53d8\u5b57\u7b26\u5e8f\u5217\u3002<\/li>\n<li>StringBuilder \u7684\u5185\u90e8\u5b9e\u73b0\u4f7f\u7528\u6570\u7ec4\uff0c\u4f46\u5b83\u4f1a\u81ea\u52a8\u91cd\u65b0\u5206\u914d\u6570\u7ec4\u4ee5\u9002\u5e94\u4e0d\u65ad\u589e\u957f\u7684\u5b57\u7b26\u5e8f\u5217\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u4e2d\u5b57\u7b26\u6570\u7ec4\u65e0\u9650\u957f\u5ea6\u600e\u4e48\u5b9a\u4e49\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u65e0\u6cd5\u5728 java \u4e2d\u5b9a\u4e49\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\u4f46\u53ef\u4ee5\u4f7f\u7528 stringbuilder \u7c7b\u5b9e\u73b0\u7c7b\u4f3c\u529f\u80fd\uff1a\u521b\u5efa stringbuilder \u5bf9\u8c61\u3002\u4f7f\u7528 append() \u65b9\u6cd5\u6dfb\u52a0\u5b57\u7b26\u3002\u4f7f\u7528 tostring() \u83b7\u53d6\u5f53\u524d\u5b57\u7b26\u5e8f\u5217\u3002 \u5982\u4f55\u5728 Java \u4e2d\u5b9a\u4e49\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4 \u5728 Java \u4e2d\uff0c\u5b57\u7b26\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u65e0\u6cd5\u52a8\u6001\u6269\u5c55\u3002\u4f46\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 StringBuilder \u7c7b\u6765\u5b9e\u73b0\u7c7b\u4f3c\u4e8e\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\u529f\u80fd\u3002 \u4f7f\u7528 StringBuilder StringBuilder \u662f\u4e00\u4e2a\u53ef\u53d8\u7684\u5b57\u7b26\u5e8f\u5217\uff0c\u5b83\u53ef\u4ee5\u52a8\u6001\u5730\u4fee\u6539\u548c\u6269\u5c55\u3002\u8981\u5b9a\u4e49\u4e00\u4e2a\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u6b65\u9aa4\u64cd\u4f5c\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u521b\u5efa StringBuilder \u5bf9\u8c61\uff1a StringBuilder sb = new StringBuilder(); \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528 append() \u65b9\u6cd5\u6dfb\u52a0\u5b57\u7b26\uff1a sb.append(&#8216;a&#8217;); \/\/ \u6dfb\u52a0\u5355\u4e2a\u5b57\u7b26 sb.append(&#8220;string&#8221;); \/\/ \u6dfb\u52a0\u5b57\u7b26\u4e32 \u767b\u5f55\u540e\u590d\u5236 \u968f\u65f6\u83b7\u53d6\u5f53\u524d\u5b57\u7b26\u5e8f\u5217\uff1a String str = sb.toString(); \u767b\u5f55\u540e\u590d\u5236 \u793a\u4f8b \u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u4f7f\u7528 StringBuilder \u5b9e\u73b0\u65e0\u9650\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u7ec4\uff1a StringBuilder sb [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-64288","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/64288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=64288"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/64288\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=64288"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=64288"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=64288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}