{"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":"chuoi-java","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/vi\/blog\/java\/java-string","title":{"rendered":"T\u00f3m t\u1eaft c\u00e1c thao t\u00e1c x\u1eed l\u00fd chu\u1ed7i c\u01a1 b\u1ea3n trong Java"},"content":{"rendered":"<h2>T\u00e1ch chu\u1ed7i \u2013 <strong>\u0111i\u1ec3m<\/strong><\/h2>\n<p>Thao t\u00e1c n\u00e0y t\u00e1ch m\u1ed9t chu\u1ed7i b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t d\u1ea5u ph\u00e2n c\u00e1ch c\u1ee5 th\u1ec3.<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\nt\u00e1o, ng\u00f4, chu\u1ed1i\r\n<\/pre>\n<h2>N\u1ed1i chu\u1ed7i c\u01a1 b\u1ea3n<\/h2>\n<p>B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng to\u00e1n t\u1eed &quot;+&quot; \u0111\u1ec3 n\u1ed1i c\u00e1c chu\u1ed7i.<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\nCh\u00e0o th\u1ebf gi\u1edbi!\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>N\u1ed1i c\u00e1c chu\u1ed7i b\u1eb1ng d\u1ea5u ph\u00e2n c\u00e1ch. <strong>Ch\u1ee7 \u0111\u1ec1:<\/strong><\/h2>\n<p>H\u00e0m n\u00e0y n\u1ed1i c\u00e1c chu\u1ed7i b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t d\u1ea5u ph\u00e2n c\u00e1ch c\u1ee5 th\u1ec3 (c\u00f3 s\u1eb5n trong Java 8 tr\u1edf l\u00ean).<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/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>To\u00e1n t\u1eed join c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 n\u1ed1i c\u00e1c m\u1ea3ng chu\u1ed7i theo c\u00f9ng m\u1ed9t c\u00e1ch.<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\nT\u00e1o, cam, chu\u1ed1i\r\n<\/pre>\n<h2>Tr\u00edch xu\u1ea5t m\u1ed9t chu\u1ed7i t\u1eeb m\u1ed9t ph\u1ea1m vi \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh. <strong>chu\u1ed7i con<\/strong><\/h2>\n<p>B\u1ea1n c\u00f3 th\u1ec3 ch\u1ec9 \u0111\u1ecbnh \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u v\u00e0 \u0111i\u1ec3m k\u1ebft th\u00fac \u0111\u1ec3 tr\u00edch xu\u1ea5t v\u00e0 tr\u00edch xu\u1ea5t m\u1ed9t ph\u1ea7n c\u1ee7a chu\u1ed7i.<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\nCh\u00e0o th\u1ebf gi\u1edbi!\r\n<\/pre>\n<h2>X\u00f3a kho\u1ea3ng tr\u1eafng \u0111\u1ea7u v\u00e0 cu\u1ed1i d\u00f2ng. <strong>c\u1eaft t\u1ec9a<\/strong><\/h2>\n<p>Lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng \u0111\u1ea7u v\u00e0 cu\u1ed1i, d\u1ea5u xu\u1ed1ng d\u00f2ng v\u00e0 d\u1ea5u tab kh\u1ecfi chu\u1ed7i k\u00fd t\u1ef1.<br \/>\nKho\u1ea3ng tr\u1eafng v\u00e0 c\u00e1c kho\u1ea3ng tr\u1eafng to\u00e0n chi\u1ec1u r\u1ed9ng trong chu\u1ed7i s\u1ebd kh\u00f4ng b\u1ecb x\u00f3a.<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\nCh\u00e0o th\u1ebf gi\u1edbi!\r\n<\/pre>\n<h2>Thay th\u1ebf m\u1ed9t ph\u1ea7n c\u1ee7a chu\u1ed7i b\u1eb1ng m\u1ed9t chu\u1ed7i kh\u00e1c. <strong>thay th\u1ebf<\/strong><\/h2>\n<p>H\u00e0m n\u00e0y thay th\u1ebf m\u1ed9t ph\u1ea7n c\u1ee7a chu\u1ed7i b\u1eb1ng m\u1ed9t chu\u1ed7i \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh. `replace` thay th\u1ebf t\u1ea5t c\u1ea3 c\u00e1c chu\u1ed7i kh\u1edbp.<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\nhe\u00d7\u00d7o wor\u00d7d!\r\n<\/pre>\n<p>`replaceFirst` ch\u1ec9 thay th\u1ebf chu\u1ed7i kh\u1edbp \u0111\u1ea7u ti\u00ean.<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\nXin ch\u00e0o th\u1ebf gi\u1edbi!\r\n<\/pre>\n<h2>Tr\u1ea3 v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng k\u00fd t\u1ef1 trong m\u1ed9t chu\u1ed7i. <strong>k\u00edch c\u1ee1<\/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>M\u00e3 v\u00ed d\u1ee5<\/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>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/p>\n<pre class=\"console\">\r\n14\r\n<\/pre>\n<p>\u0110\u1ec3 t\u00ecm s\u1ed1 byte, h\u00e3y s\u1eed d\u1ee5ng String.getBytes().length. V\u00ec Java 8 s\u1eed d\u1ee5ng UTF8 l\u00e0m m\u00e3 h\u00f3a k\u00fd t\u1ef1 m\u1eb7c \u0111\u1ecbnh, m\u1ed7i k\u00fd t\u1ef1 c\u00f3 \u0111\u1ed9 r\u1ed9ng \u0111\u1ea7y \u0111\u1ee7 l\u00e0 3 byte.<\/p>\n<h4>M\u00e3 v\u00ed d\u1ee5<\/h4>\n<pre class=\"sample_src\">\r\npublic static void byteLengthSample() { String str = &quot;\u3007\u3007 T\u1ec9nh \u25a1\u25a1 Th\u00e0nh ph\u1ed1 \u25b3\u25b3 Th\u1ecb tr\u1ea5n 10-11&quot;; System.out.println(str.getBytes().length); }\r\n<\/pre>\n<p>K\u1ebft qu\u1ea3 \u0111\u1ea7u ra:<\/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\/vi\/wp-json\/wp\/v2\/posts\/4617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/comments?post=4617"}],"version-history":[{"count":8,"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/posts\/4617\/revisions"}],"predecessor-version":[{"id":4628,"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/posts\/4617\/revisions\/4628"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/media?parent=4617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/categories?post=4617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/vi\/wp-json\/wp\/v2\/tags?post=4617"}],"curies":[{"name":"trang web","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}