{"id":367,"date":"2024-06-22T15:28:15","date_gmt":"2024-06-22T07:28:15","guid":{"rendered":"http:\/\/www.cmd137blog.top\/?p=367"},"modified":"2024-11-10T22:57:17","modified_gmt":"2024-11-10T14:57:17","slug":"java-%e6%a0%b8%e5%bf%83%e7%b1%bb-string%e7%9b%b8%e5%85%b3","status":"publish","type":"post","link":"http:\/\/www.cmd137blog.top\/?p=367","title":{"rendered":"JAVA-\u6838\u5fc3\u7c7b-String\u76f8\u5173"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">1 String\u6982\u8ff0\uff1a<\/h1>\n\n\n\n<p>String \u662f\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b\u3002\u5728 java.lang \u5305\u4e2d\uff0c\u65e0\u9700\u624b\u52a8\u5bfc\u5305\u3002<\/p>\n\n\n\n<p>\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\u5728\u521b\u5efa\u540e\u5b58\u653e\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff08StringTable\uff09\u4e2d\uff0c\u4e0d\u4f1a\u53d1\u751f\u6539\u53d8\u3002\u76f4\u63a5\u62fc\u63a5\u3001\u66f4\u6539\u5b57\u7b26\u4e32\u4f1a\u4ea7\u751f\u65b0\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p>Java\u4e2d\u6240\u6709\u5b57\u7b26\u4e32\u90fd\u662fString\u7c7b\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528str.charAt()\u6765\u83b7\u53d6\u5355\u4e2a\u5b57\u7b26\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528str.toCharArray()\u6765\u5c06\u5b57\u7b26\u4e32\u8f6c\u53d8\u4e3a\u5b57\u7b26\u6570\u7ec4<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">2 \u521b\u5efaString\u5bf9\u8c61\uff1a<\/h1>\n\n\n\n<p>\u5171\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.1 \u76f4\u63a5\u8d4b\u503c\uff1a<\/h2>\n\n\n\n<p>String str = &#8220;abcd&#8221;;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.2 new \u6784\u9020\uff1a<\/h2>\n\n\n\n<p>\u4e0d\u5e38\u7528\u3002<\/p>\n\n\n\n<p>\u6784\u9020\u65b9\u6cd5\u53c2\u6570\u6709\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7a7a\u53c2\u6784\u9020<\/li>\n\n\n\n<li>\u5b57\u7b26\u4e32<\/li>\n\n\n\n<li>char\u6570\u7ec4<\/li>\n\n\n\n<li>byte\u6570\u7ec4<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">3 \u5b57\u7b26\u4e32\u7684\u6bd4\u8f83\uff1a== \u4e0e .equals()<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u201c==\u201d\u6bd4\u8f83\u7684\u662f\u5728\u4e32\u6c60\u4e2d\u7684\u5730\u5740\uff1b<\/li>\n\n\n\n<li>strA.equals(string strB)\u6bd4\u8f83\u7684\u662f\u4e24\u5b57\u7b26\u4e32\u7684\u5185\u5bb9<\/li>\n\n\n\n<li>strA.equalsIgnoreCase()\u6bd4\u8f83\u4e24\u5bf9\u8c61\u7684\u5185\u5bb9\uff0c\u4f46\u5ffd\u7565\u5927\u5c0f\u5199\uff0c\u5e38\u7528\u4e8e\u9a8c\u8bc1\u7801<\/li>\n<\/ul>\n\n\n\n<p>\u5e38\u7528.equals()\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">4 \u5b57\u7b26\u4e32\u7684\u622a\u53d6\uff1asubString\uff08\uff09\u65b9\u6cd5<\/h1>\n\n\n\n<p>Java\u4e2d\u7684<code>substring<\/code>\u65b9\u6cd5\u7528\u4e8e\u63d0\u53d6\u5b57\u7b26\u4e32\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u8fd9\u4e2a\u65b9\u6cd5\u6709\u4e24\u4e2a\u91cd\u8f7d\u7248\u672c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>String substring(int beginIndex)<\/code>\uff1a\u8fd4\u56de\u4ece\u6307\u5b9a\u7684 <code>beginIndex<\/code> \u5f00\u59cb\u5230\u5b57\u7b26\u4e32\u7ed3\u5c3e\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>String substring(int beginIndex, int endIndex)<\/code>\uff1a\u8fd4\u56de\u4ece\u6307\u5b9a\u7684 <code>beginIndex<\/code> \u5f00\u59cb\u5230 <code>endIndex<\/code> \u7ed3\u675f\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u6ce8\u610f\uff0c\u8fd4\u56de\u7684\u5b50\u5b57\u7b26\u4e32\u5305\u542b <code>beginIndex<\/code> \u5904\u7684\u5b57\u7b26\uff0c\u4f46\u4e0d\u5305\u542b <code>endIndex<\/code> \u5904\u7684\u5b57\u7b26\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4f8b\uff1a\u7535\u8bdd\u53f7\u7801\u7684\u622a\u53d6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    public static void main(String&#91;] args) {\n        String phoneNumber=\"12312312345\";\n        String begin=phoneNumber.substring(0,3);\n        String last=phoneNumber.substring(7);\n        String result=begin+\"****\"+last;\n        System.out.println(result);\n    }<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">5 \u5b57\u7b26\u4e32\u7684\u66ff\u6362\uff1arepalce\uff08\uff09\u65b9\u6cd5<\/h1>\n\n\n\n<p>Java\u4e2d\u7684replace\u65b9\u6cd5\u7528\u4e8e\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u6216\u5b50\u5b57\u7b26\u4e32\u3002\u8fd9\u4e2a\u65b9\u6cd5\u6709\u4e24\u4e2a\u5e38\u7528\u7684\u91cd\u8f7d\u7248\u672c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>String replace(char oldChar, char newChar)\uff1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\uff0c\u5728\u8fd9\u4e2a\u5b57\u7b26\u4e32\u4e2d\uff0c\u6240\u6709\u51fa\u73b0\u7684 oldChar \u90fd\u88ab\u66ff\u6362\u4e3a newChar\u3002<\/li>\n\n\n\n<li>String replace(String oldstring,String newstring)\uff1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\uff0c\u5728\u8fd9\u4e2a\u5b57\u7b26\u4e32\u4e2d\uff0c\u6240\u6709\u51fa\u73b0\u7684 oldstring \u90fd\u88ab\u66ff\u6362\u4e3a newstring\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String&#91;] args) {\n        String talk=\"\u4f60\u73a9\u7684\u771fTMD\u597d\uff0c\u4ee5\u540e\u4e0d\u8981\u518d\u73a9\u4e86\uff01cnm\";\n        talk=talk.replace(\"TMD\",\"***\").replace(\"cnm\",\"***\");\n        System.out.println(talk);\n    }<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\u4e3a\uff1a\u4f60\u73a9\u7684\u771f***\u597d\uff0c\u4ee5\u540e\u4e0d\u8981\u518d\u73a9\u4e86\uff01***<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">6 \u5b57\u7b26\u4e32\u7684\u5206\u5272  split\uff1a<\/h1>\n\n\n\n<p>\u5728 Java \u4e2d\uff0c<code>split<\/code> \u65b9\u6cd5\u662f <code>String<\/code> \u7c7b\u7684\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u5b83\u7528\u4e8e\u6839\u636e\u6307\u5b9a\u7684\u5206\u9694\u7b26\u5c06\u5b57\u7b26\u4e32\u5206\u5272\u6210\u5b50\u5b57\u7b26\u4e32\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u3002\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u5206\u9694\u7b26\uff0c\u4f7f\u5f97\u5b57\u7b26\u4e32\u5206\u5272\u975e\u5e38\u7075\u6d3b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528&nbsp;<code>split<\/code>&nbsp;\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u57fa\u672c\u7528\u6cd5<\/h4>\n\n\n\n<p><code>split<\/code> \u65b9\u6cd5\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>public String[] split(String regex)<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>regex<\/code>\uff1a\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u7528\u4e8e\u6307\u5b9a\u5206\u9694\u7b26\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b<\/h4>\n\n\n\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5305\u542b\u7528\u9017\u53f7\u5206\u9694\u7684\u6570\u5b57\uff0c\u6211\u4eec\u60f3\u8981\u5c06\u8fd9\u4e9b\u6570\u5b57\u5206\u5272\u6210\u5355\u72ec\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java<code>String numbers = \"1,2,3,4,5\";\nString[] numberArray = numbers.split(\",\"); <em>\/\/ \u4f7f\u7528\u9017\u53f7\u4f5c\u4e3a\u5206\u9694\u7b26<\/em><\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>split<\/code> \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32 <code>\"1,2,3,4,5\"<\/code> \u5206\u5272\u6210\u4e94\u4e2a\u5b50\u5b57\u7b26\u4e32\uff1a<code>[\"1\", \"2\", \"3\", \"4\", \"5\"]<\/code>\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/h4>\n\n\n\n<p><code>split<\/code> \u65b9\u6cd5\u4e5f\u652f\u6301\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u5206\u9694\u7b26\uff0c\u8fd9\u4f7f\u5f97\u5206\u5272\u66f4\u52a0\u7075\u6d3b\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u6839\u636e\u4e00\u4e2a\u6216\u591a\u4e2a\u7a7a\u683c\u6765\u5206\u5272\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java<code>String text = \"Hello World! How are you?\";\nString[] words = text.split(\"\\\\s+\"); <em>\/\/ \\s+ \u8868\u793a\u4e00\u4e2a\u6216\u591a\u4e2a\u7a7a\u767d\u5b57\u7b26<\/em><\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>split<\/code> \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32 <code>\"Hello World! How are you?\"<\/code> \u5206\u5272\u6210\u591a\u4e2a\u5b50\u5b57\u7b26\u4e32\uff0c\u6bcf\u4e2a\u5355\u8bcd\u90fd\u662f\u4e00\u4e2a\u5143\u7d20\uff1a<code>[\"Hello\", \"World!\", \"How\", \"are\", \"you?\"]<\/code>\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">7 \u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u4e0eStringBuild\uff1a<\/h1>\n\n\n\n<p>Java\u7f16\u8bd1\u5668\u5bf9<code>String<\/code>\u505a\u4e86\u7279\u6b8a\u5904\u7406\uff0c\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u7528 <code> +<\/code>   \u62fc\u63a5\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7.1 StringBuild\u6982\u8ff0\uff1a<\/h2>\n\n\n\n<p>\u7531\u4e8e\u5b57\u7b26\u4e32\u4e0d\u53ef\u53d8\uff0c\u6240\u4ee5\u5f53\u62fc\u63a5\u5b57\u7b26\u4e32\u7684\u65f6\u5019\uff08\u5c24\u5176\u662f\u4f7f\u7528<code>+<\/code>\u53f7\u64cd\u4f5c\u7b26\uff09\u7684\u65f6\u5019\uff0c\u5c31\u9700\u8981\u8003\u91cf\u6027\u80fd\u7684\u95ee\u9898\uff0c\u4f60\u4e0d\u80fd\u6beb\u65e0\u987e\u8651\u5730\u751f\u4ea7\u592a\u591a String \u5bf9\u8c61\uff0c\u5bf9\u73cd\u8d35\u7684\u5185\u5b58\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u538b\u529b\u3002<\/p>\n\n\n\n<p>\u4e8e\u662f Java \u5c31\u8bbe\u8ba1\u4e86\u4e00\u4e2a\u4e13\u95e8\u7528\u6765\u89e3\u51b3\u6b64\u95ee\u9898\u7684 StringBuild \u7c7b\u3002<\/p>\n\n\n\n<p>StringBuild\u7c7b\u7684\u5bf9\u8c61\u53ef\u4ee5\u7b80\u5355\u89c6\u4f5c\u4e00\u4e2a\u5bb9\u5668\uff0c\u53ef\u4ee5\u6539\u53d8\u5b83\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7.2 \u65b9\u6cd5\uff1a<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6784\u9020\u65b9\u6cd5\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>StringBuilder()<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684<code>StringBuilder<\/code>\u5bf9\u8c61\uff0c\u521d\u59cb\u5bb9\u91cf\u4e3a16\u4e2a\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>StringBuilder(int capacity)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u6307\u5b9a\u521d\u59cb\u5bb9\u91cf\u7684<code>StringBuilder<\/code>\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>capacity<\/code>\uff1a\u521d\u59cb\u5bb9\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>StringBuilder(String str)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u6307\u5b9a\u5b57\u7b26\u4e32\u5185\u5bb9\u7684<code>StringBuilder<\/code>\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>str<\/code>\uff1a\u521d\u59cb\u5316\u5185\u5bb9\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5e38\u7528\u65b9\u6cd5\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>StringBuilder append(Object obj)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c06\u6307\u5b9a\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u8ffd\u52a0\u5230\u6b64\u5e8f\u5217\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>obj<\/code>\uff1a\u8981\u8ffd\u52a0\u7684\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a<code>StringBuilder<\/code>\u5bf9\u8c61\u672c\u8eab\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>StringBuilder insert(int offset, Object obj)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5728\u6307\u5b9a\u4f4d\u7f6e\u63d2\u5165\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>offset<\/code>\uff1a\u63d2\u5165\u4f4d\u7f6e\u7684\u504f\u79fb\u91cf\u3002<\/li>\n\n\n\n<li><code>obj<\/code>\uff1a\u8981\u63d2\u5165\u7684\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a<code>StringBuilder<\/code>\u5bf9\u8c61\u672c\u8eab\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>StringBuilder delete(int start, int end)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5220\u9664\u4ece\u6307\u5b9a\u5f00\u59cb\u7d22\u5f15\u5230\u7ed3\u675f\u7d22\u5f15\uff08\u4e0d\u5305\u62ec\uff09\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>start<\/code>\uff1a\u5f00\u59cb\u7d22\u5f15\uff08\u5305\u542b\uff09\u3002<\/li>\n\n\n\n<li><code>end<\/code>\uff1a\u7ed3\u675f\u7d22\u5f15\uff08\u4e0d\u5305\u542b\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a<code>StringBuilder<\/code>\u5bf9\u8c61\u672c\u8eab\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>int capacity()<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u8fd4\u56de\u5f53\u524d<code>StringBuilder<\/code>\u5bf9\u8c61\u7684\u5bb9\u91cf\u3002<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a\u5bb9\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>String toString()<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u8fd4\u56de\u6b64\u5e8f\u5217\u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u3002<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>StringBuilder reverse()<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c06\u6b64\u5b57\u7b26\u5e8f\u5217\u7528\u5176\u53cd\u8f6c\u5f62\u5f0f\u53d6\u4ee3\u3002<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a<code>StringBuilder<\/code>\u5bf9\u8c61\u672c\u8eab\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u5176\u4ed6\u5982subString\u3001replace\u4e0eString\u7c7b\u7684\u4e00\u6837\u3002<\/p>\n\n\n\n<p><strong>\u6ce8\u610f<\/strong>\uff1a\u5bf9\u4e8e\u666e\u901a\u7684\u5b57\u7b26\u4e32<code>+<\/code>\u64cd\u4f5c\uff0c\u5e76\u4e0d\u9700\u8981\u6211\u4eec\u5c06\u5176\u6539\u5199\u4e3a<code>StringBuilder<\/code>\uff0c\u56e0\u4e3aJava\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u5c31\u81ea\u52a8\u628a\u591a\u4e2a\u8fde\u7eed\u7684<code>+<\/code>\u64cd\u4f5c\u7f16\u7801\u4e3a<code>StringConcatFactory<\/code>\u7684\u64cd\u4f5c\u3002\u5728\u8fd0\u884c\u671f\uff0c<code>StringConcatFactory<\/code>\u4f1a\u81ea\u52a8\u628a\u5b57\u7b26\u4e32\u8fde\u63a5\u64cd\u4f5c\u4f18\u5316\u4e3a\u6570\u7ec4\u590d\u5236\u6216\u8005<code>StringBuilder<\/code>\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">StringBuffer<\/h2>\n\n\n\n<p><code>StringBuffer<\/code>\uff0c\u8fd9\u662fJava\u65e9\u671f\u7684\u4e00\u4e2a<code>StringBuilder<\/code>\u7684\u7ebf\u7a0b\u5b89\u5168\u7248\u672c\uff0c\u5b83\u901a\u8fc7\u540c\u6b65\u6765\u4fdd\u8bc1\u591a\u4e2a\u7ebf\u7a0b\u64cd\u4f5c<code>StringBuffer<\/code>\u4e5f\u662f\u5b89\u5168\u7684\uff0c\u4f46\u662f\u540c\u6b65\u4f1a\u5e26\u6765\u6267\u884c\u901f\u5ea6\u7684\u4e0b\u964d\u3002<\/p>\n\n\n\n<p><code>StringBuilder<\/code>\u548c<code>StringBuffer<\/code>\u63a5\u53e3\u5b8c\u5168\u76f8\u540c\uff0c<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">8 StringJoiner\uff1a<\/h1>\n\n\n\n<p>\u8981\u9ad8\u6548\u62fc\u63a5\u5b57\u7b26\u4e32\uff0c\u5e94\u8be5\u4f7f\u7528<code>StringBuilder<\/code>\u3002<\/p>\n\n\n\n<p><code>StringJoiner<\/code>\u662fJava 8\u5f15\u5165\u7684\u65b0\u7c7b\uff0c\u7528\u4e8e\u751f\u6210\u7531\u5206\u9694\u7b26\u5206\u9694\u7684\u5b57\u7b26\u4e32\u5e8f\u5217\u3002\u5b83\u7b80\u5316\u4e86\u5b57\u7b26\u4e32\u8fde\u63a5\u7684\u8fc7\u7a0b\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u96c6\u5408\u6216\u6570\u7ec4\u65f6\u3002<code>StringJoiner<\/code>\u63d0\u4f9b\u4e86\u53ef\u9009\u7684\u524d\u7f00\u548c\u540e\u7f00\uff0c\u53ef\u4ee5\u5728\u751f\u6210\u7684\u5b57\u7b26\u4e32\u4e4b\u524d\u548c\u4e4b\u540e\u6dfb\u52a0\u5185\u5bb9\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6784\u9020\u65b9\u6cd5\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>StringJoiner(CharSequence delimiter)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u521b\u5efa\u4e00\u4e2a\u6ca1\u6709\u524d\u7f00\u548c\u540e\u7f00\u7684<code>StringJoiner<\/code>\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>delimiter<\/code>\uff1a\u5206\u9694\u7b26\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>StringJoiner(CharSequence delimiter, CharSequence prefix, CharSequence suffix)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u6307\u5b9a\u524d\u7f00\u548c\u540e\u7f00\u7684<code>StringJoiner<\/code>\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>delimiter<\/code>\uff1a\u5206\u9694\u7b26\u3002<\/li>\n\n\n\n<li><code>prefix<\/code>\uff1a\u524d\u7f00\u3002<\/li>\n\n\n\n<li><code>suffix<\/code>\uff1a\u540e\u7f00\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5e38\u7528\u65b9\u6cd5\uff1a<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">\u5e38\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>StringJoiner add(CharSequence newElement)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c06\u6307\u5b9a\u7684\u5185\u5bb9\u6dfb\u52a0\u5230<code>StringJoiner<\/code>\u4e2d\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>newElement<\/code>\uff1a\u8981\u6dfb\u52a0\u7684\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a\u6b64<code>StringJoiner<\/code>\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>StringJoiner merge(StringJoiner other)<\/code><\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c06\u53e6\u4e00\u4e2a<code>StringJoiner<\/code>\u7684\u5185\u5bb9\u5408\u5e76\u5230\u6b64<code>StringJoiner<\/code>\u4e2d\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\n<ul class=\"wp-block-list\">\n<li><code>other<\/code>\uff1a\u8981\u5408\u5e76\u7684<code>StringJoiner<\/code>\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u8fd4\u56de\u503c\uff1a\u6b64<code>StringJoiner<\/code>\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">public static void main(String[] args) {<br>    StringJoiner sj1 =new StringJoiner(\", \",\"[\",\"]\");<br>    sj1.add(\"aaa\").add(\"bbb\").add(\"ccc\").add(\"ddd\");<br>    System.<em>out<\/em>.println(sj1);<br>    StringJoiner sj2 =new StringJoiner(\", \",\"[\",\"]\");<br>    sj2.add(\"11\").add(\"22\").add(\"33\").add(\"44\");<br>    System.<em>out<\/em>.println(sj2);<br>    sj1.merge(sj2);<br>    System.<em>out<\/em>.println(sj1);<br>}<\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">9 \u5176\u4ed6\u6848\u4f8b\uff1a<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">9.1 \u91d1\u989d\u6570\u5b57\u8f6c\u5927\u5199\uff1a<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Stringdemo {\n    public static void main(String&#91;] args) {\n        Scanner sc=new Scanner(System.in);\n        int cash=sc.nextInt();\n        toLargecash(cash);\n    }\n\n    public static void toLargecash(int cash){\n        char&#91;] Large={'\u96f6','\u58f9','\u8d30','\u53c1','\u8086','\u4f0d','\u9646','\u67d2','\u6252','\u7396'};\n        int&#91;] arr_cash={0,0,0,0,0,0,0};\n        for (int i = 0; i &lt; 7; i++) {\n            int digit=cash%10;\n            cash\/=10;\n            if (digit==0)\n                continue;\n            else {\n                arr_cash&#91;i]=digit;\n            }\n        }\n        System.out.print(Large&#91;arr_cash&#91;6]]+\"\u4f70\");\n        System.out.print(Large&#91;arr_cash&#91;5]]+\"\u62fe\");\n        System.out.print(Large&#91;arr_cash&#91;4]]+\"\u4e07\");\n        System.out.print(Large&#91;arr_cash&#91;3]]+\"\u4edf\");\n        System.out.print(Large&#91;arr_cash&#91;2]]+\"\u4f70\");\n        System.out.print(Large&#91;arr_cash&#91;1]]+\"\u62fe\");\n        System.out.println(Large&#91;arr_cash&#91;0]]+\"\u5143\");\n\n    }\n}<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>1 String\u6982\u8ff0\uff1a String \u662f\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b\u3002\u5728 java.lang \u5305\u4e2d\uff0c\u65e0\u9700\u624b\u52a8\u5bfc\u5305\u3002 \u5b57\u7b26\u4e32\u7684\u5185 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56],"tags":[25,54,53],"class_list":{"0":"post-367","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-java","7":"tag-java","9":"tag-string"},"_links":{"self":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/367","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=367"}],"version-history":[{"count":5,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/367\/revisions"}],"predecessor-version":[{"id":517,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/367\/revisions\/517"}],"wp:attachment":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=367"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=367"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=367"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}