{"id":37229,"date":"2023-12-11T14:40:43","date_gmt":"2023-12-11T06:40:43","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=37229"},"modified":"2023-12-11T14:40:43","modified_gmt":"2023-12-11T06:40:43","slug":"string-%e5%92%8c-stringbu%ef%ac%80er%e3%80%81stringbuilder-%e7%9a%84%e5%8c%ba%e5%88%ab%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f%e9%87%8d%e8%a6%81","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/string-%e5%92%8c-stringbu%ef%ac%80er%e3%80%81stringbuilder-%e7%9a%84%e5%8c%ba%e5%88%ab%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f%e9%87%8d%e8%a6%81\/","title":{"rendered":"String \u548c StringBu\ufb00er\u3001StringBuilder \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f\u91cd\u8981"},"content":{"rendered":"<p>&#8220;`&#8221;                    <strong>\u53ef\u53d8\u6027<\/strong><\/p>\n<p>\u7b80\u5355\u7684\u6765\u8bf4\uff1aString \u7c7b\u4e2d\u4f7f\u7528 final \u5173\u952e\u5b57\u4fee\u9970\u5b57\u7b26\u6570\u7ec4\u6765\u4fdd\u5b58\u5b57\u7b26\u4e32\uff0c<code>private\u3000final\u3000char\u3000value[]<\/code>\uff0c\u6240\u4ee5 String \u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u800cStringBuilder \u4e0e StringBuffer \u90fd\u7ee7\u627f\u81ea AbstractStringBuilder \u7c7b\uff0c\u5728 AbstractStringBuilder \u4e2d\u4e5f\u662f\u4f7f\u7528\u5b57\u7b26\u6570\u7ec4\u4fdd\u5b58\u5b57\u7b26\u4e32<code>char[]value<\/code> \u4f46\u662f\u6ca1\u6709\u7528 final \u5173\u952e\u5b57\u4fee\u9970\uff0c\u6240\u4ee5\u8fd9\u4e24\u79cd\u5bf9\u8c61\u90fd\u662f\u53ef\u53d8\u7684\u3002<\/p>\n<p>StringBuilder \u4e0e StringBuffer \u7684\u6784\u9020\u65b9\u6cd5\u90fd\u662f\u8c03\u7528\u7236\u7c7b\u6784\u9020\u65b9\u6cd5\u4e5f\u5c31\u662f AbstractStringBuilder \u5b9e\u73b0\u7684\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u67e5\u9605\u6e90\u7801\u3002<\/p>\n<p>AbstractStringBuilder.java<\/p>\n<pre><code>javaabstract class AbstractStringBuilder implements Appendable, CharSequence {    char[] value;    int count;    AbstractStringBuilder() {    }    AbstractStringBuilder(int capacity) {        value = new char[capacity];    }<\/code><\/pre>\n<p><strong>\u7ebf\u7a0b\u5b89\u5168\u6027<\/strong><\/p>\n<p>String \u4e2d\u7684\u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u4e5f\u5c31\u53ef\u4ee5\u7406\u89e3\u4e3a\u5e38\u91cf\uff0c\u7ebf\u7a0b\u5b89\u5168\u3002AbstractStringBuilder \u662f StringBuilder \u4e0e StringBuffer \u7684\u516c\u5171\u7236\u7c7b\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e9b\u5b57\u7b26\u4e32\u7684\u57fa\u672c\u64cd\u4f5c\uff0c\u5982 expandCapacity\u3001append\u3001insert\u3001indexOf \u7b49\u516c\u5171\u65b9\u6cd5\u3002StringBuffer \u5bf9\u65b9\u6cd5\u52a0\u4e86\u540c\u6b65\u9501\u6216\u8005\u5bf9\u8c03\u7528\u7684\u65b9\u6cd5\u52a0\u4e86\u540c\u6b65\u9501\uff0c\u6240\u4ee5\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002StringBuilder \u5e76\u6ca1\u6709\u5bf9\u65b9\u6cd5\u8fdb\u884c\u52a0\u540c\u6b65\u9501\uff0c\u6240\u4ee5\u662f\u975e\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u3000<\/p>\n<p><strong>\u6027\u80fd<\/strong><\/p>\n<p>\u6bcf\u6b21\u5bf9 String \u7c7b\u578b\u8fdb\u884c\u6539\u53d8\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684 String \u5bf9\u8c61\uff0c\u7136\u540e\u5c06\u6307\u9488\u6307\u5411\u65b0\u7684 String \u5bf9\u8c61\u3002StringBuffer \u6bcf\u6b21\u90fd\u4f1a\u5bf9 StringBuffer \u5bf9\u8c61\u672c\u8eab\u8fdb\u884c\u64cd\u4f5c\uff0c\u800c\u4e0d\u662f\u751f\u6210\u65b0\u7684\u5bf9\u8c61\u5e76\u6539\u53d8\u5bf9\u8c61\u5f15\u7528\u3002\u76f8\u540c\u60c5\u51b5\u4e0b\u4f7f\u7528 StringBuilder \u76f8\u6bd4\u4f7f\u7528 StringBuffer \u4ec5\u80fd\u83b7\u5f97 10%~15% \u5de6\u53f3\u7684\u6027\u80fd\u63d0\u5347\uff0c\u4f46\u5374\u8981\u5192\u591a\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u98ce\u9669\u3002<\/p>\n<p><strong>\u5bf9\u4e8e\u4e09\u8005\u4f7f\u7528\u7684\u603b\u7ed3\uff1a<\/strong> <\/p>\n<ol>\n<li>\u64cd\u4f5c\u5c11\u91cf\u7684\u6570\u636e: \u9002\u7528String<\/li>\n<li>\u5355\u7ebf\u7a0b\u64cd\u4f5c\u5b57\u7b26\u4e32\u7f13\u51b2\u533a\u4e0b\u64cd\u4f5c\u5927\u91cf\u6570\u636e: \u9002\u7528StringBuilder<\/li>\n<li>\u591a\u7ebf\u7a0b\u64cd\u4f5c\u5b57\u7b26\u4e32\u7f13\u51b2\u533a\u4e0b\u64cd\u4f5c\u5927\u91cf\u6570\u636e: \u9002\u7528StringBuffer<\/li>\n<\/ol>\n<pre><code>            \"```\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`&#8221; \u53ef\u53d8\u6027 \u7b80\u5355\u7684\u6765\u8bf4\uff1aString \u7c7b\u4e2d\u4f7f\u7528 final \u5173\u952e\u5b57\u4fee\u9970\u5b57\u7b26\u6570\u7ec4\u6765\u4fdd [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37229","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37229","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37229"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37229\/revisions"}],"predecessor-version":[{"id":37230,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37229\/revisions\/37230"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37229"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37229"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}