{"id":4617,"date":"2019-10-19T13:31:09","date_gmt":"2019-10-19T04:31:09","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=4617"},"modified":"2019-10-19T13:43:05","modified_gmt":"2019-10-19T04:43:05","slug":"java-%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/zh\/blog\/java\/java-string","title":{"rendered":"Java \u4e2d\u57fa\u672c\u5b57\u7b26\u4e32\u64cd\u4f5c\u6982\u8ff0"},"content":{"rendered":"<h2>\u5206\u5272\u5b57\u7b26\u4e32 \u2013 <strong>\u70b9<\/strong><\/h2>\n<p>\u6b64\u64cd\u4f5c\u4f7f\u7528\u7279\u5b9a\u5206\u9694\u7b26\u5206\u5272\u5b57\u7b26\u4e32\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void splitSample() {\r\n    String line = \"\u308a\u3093\u3054,\u307f\u304b\u3093,\u30d0\u30ca\u30ca\";\r\n    String[] fruits = line.split(\",\");\r\n    for (String fruit : fruits) {\r\n        System.out.println(fruit);\r\n    }\r\n}\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u82f9\u679c\u3001\u7389\u7c73\u3001\u9999\u8549\r\n<\/pre>\n<h2>\u57fa\u672c\u5b57\u7b26\u4e32\u8fde\u63a5<\/h2>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528\u201c+\u201d\u8fd0\u7b97\u7b26\u8fde\u63a5\u5b57\u7b26\u4e32\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void plusSample() { String s1 = &quot;hello &quot;; String s2 = &quot;world!&quot;; System.out.println(s1 + s2); }\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u4f60\u597d\u4e16\u754c\uff01\r\n<\/pre>\n<p><script type=\"text\/javascript\" src=\"https:\/\/chat-messenger.com\/js\/common.js?dd12sssas2223\" charset=\"UTF-8\"><\/script><br \/>\n<script type=\"text\/javascript\"> writePR(); <\/script><\/p>\n<h2>\u4f7f\u7528\u5206\u9694\u7b26\u8fde\u63a5\u5b57\u7b26\u4e32\u3002 <strong>\u4e3b\u9898\uff1a<\/strong><\/h2>\n<p>\u6b64\u51fd\u6570\u4f7f\u7528\u7279\u5b9a\u5206\u9694\u7b26\u8fde\u63a5\u5b57\u7b26\u4e32\uff08Java 8 \u53ca\u66f4\u9ad8\u7248\u672c\u53ef\u7528\uff09\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void joinSample() {\r\n    String line = String.join(\",\", \"\u308a\u3093\u3054\", \"\u307f\u304b\u3093\", \"\u30d0\u30ca\u30ca\");\r\n    System.out.println(line);\r\n}\r\n<\/pre>\n<p>\u8fde\u63a5\u8fd0\u7b97\u7b26\u4e5f\u53ef\u4ee5\u7528\u540c\u6837\u7684\u65b9\u6cd5\u8fde\u63a5\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/p>\n<pre class=\"sample_src\">\r\npublic static void joinArraySample() {\r\n    String[] fruits = {\"\u308a\u3093\u3054\", \"\u307f\u304b\u3093\", \"\u30d0\u30ca\u30ca\"};\r\n    String line = String.join(\",\", fruits);\r\n    System.out.println(line); \/\/\u7d50\u679c\u306f\u540c\u3058\r\n}\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u82f9\u679c\u3001\u6a59\u5b50\u3001\u9999\u8549\r\n<\/pre>\n<h2>\u4ece\u6307\u5b9a\u8303\u56f4\u5185\u63d0\u53d6\u5b57\u7b26\u4e32\u3002 <strong>\u5b50\u5b57\u7b26\u4e32<\/strong><\/h2>\n<p>\u60a8\u53ef\u4ee5\u6307\u5b9a\u63d0\u53d6\u7684\u8d77\u59cb\u70b9\u548c\u7ed3\u675f\u70b9\uff0c\u5e76\u63d0\u53d6\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void substringSample() {\r\n    String str = \"hello world!\";\r\n    System.out.println(str.substring(0, 5));\r\n    System.out.println(str.substring(2, 9));\r\n    System.out.println(str.substring(6)); \/\/\u59cb\u70b9\u3060\u3051\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\r\n}\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u4f60\u597d\uff0c\u4e16\u754c\uff01\r\n<\/pre>\n<h2>\u5220\u9664\u5f00\u5934\u548c\u7ed3\u5c3e\u7684\u7a7a\u683c\u3002 <strong>\u4fee\u526a<\/strong><\/h2>\n<p>\u5220\u9664\u5b57\u7b26\u4e32\u5f00\u5934\u548c\u7ed3\u5c3e\u7684\u7a7a\u683c\u3001\u6362\u884c\u7b26\u548c\u5236\u8868\u7b26\u3002<br \/>\n\u5b57\u7b26\u4e32\u4e2d\u7684\u7a7a\u767d\u5b57\u7b26\u548c\u5168\u89d2\u7a7a\u683c\u4e0d\u4f1a\u88ab\u5220\u9664\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void trimSample() { String str = &quot; hello world!&quot;; System.out.println(str.trim()); }\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u4f60\u597d\u4e16\u754c\uff01\r\n<\/pre>\n<h2>\u5c06\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u66ff\u6362\u4e3a\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002 <strong>\u4ee3\u66ff<\/strong><\/h2>\n<p>\u6b64\u51fd\u6570\u5c06\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u66ff\u6362\u4e3a\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u3002`replace` \u4f1a\u66ff\u6362\u6240\u6709\u5339\u914d\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void replaceSample() {\r\n    String str = \"hello world!\";\r\n    System.out.println(str.replace(\"l\", \"\u00d7\"));\r\n}\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\nhe\u00d7\u00d7o wor\u00d7d\uff01\r\n<\/pre>\n<p>`replaceFirst` \u53ea\u4f1a\u66ff\u6362\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void replaceFirstSample() { String str = &quot;hello world!&quot;; System.out.println(str.replaceFirst(&quot;l&quot;, &quot;\u00d7&quot;)); }\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u4f60\u597d\u4e16\u754c\uff01\r\n<\/pre>\n<h2>\u8fd4\u56de\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u6570\u3002 <strong>\u5c3a\u5bf8<\/strong><\/h2>\n<p>\u6587\u5b57\u5217\u306e\u6587\u5b57\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002String.length()\u306f\u5358\u7d14\u306b\u6587\u5b57\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void lengthSample() {\r\n    String str = \"\u3007\u3007\u770c\u25a1\u25a1\u5e02\u25b3\u25b3\u753a10-11\";\r\n    System.out.println(str.length());\r\n}\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n14\r\n<\/pre>\n<p>\u8981\u83b7\u53d6\u5b57\u8282\u6570\uff0c\u8bf7\u4f7f\u7528 String.getBytes().length\u3002\u7531\u4e8e Java 8 \u4f7f\u7528 UTF-8 \u4f5c\u4e3a\u9ed8\u8ba4\u5b57\u7b26\u7f16\u7801\uff0c\u56e0\u6b64\u6bcf\u4e2a\u5168\u89d2\u5b57\u7b26\u5360\u7528 3 \u4e2a\u5b57\u8282\u3002<\/p>\n<h4>\u793a\u4f8b\u4ee3\u7801<\/h4>\n<pre class=\"sample_src\">\r\npublic static void byteLengthSample() { String str = &quot;\u3007\u3007 \u5e9c \u25a1\u25a1 \u5e02 \u25b3\u25b3 \u9547 10-11&quot;; System.out.println(str.getBytes().length); }\r\n<\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n32\r\n<\/pre>","protected":false},"excerpt":{"rendered":"<p>\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308b &#8211; split \u7279\u5b9a\u306e\u6587\u5b57\u5217(\u30c7\u30ea\u30df\u30bf)\u3067\u6587\u5b57\u5217\u3092\u5206\u5272\u3057\u307e\u3059\u3002 \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[19],"tags":[],"class_list":["post-4617","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/4617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/comments?post=4617"}],"version-history":[{"count":8,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/4617\/revisions"}],"predecessor-version":[{"id":4628,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/4617\/revisions\/4628"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/media?parent=4617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/categories?post=4617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/tags?post=4617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}