{"id":50722,"date":"2023-12-23T10:31:38","date_gmt":"2023-12-23T02:31:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e5%ad%97%e7%ac%a6%e4%b8%b2\/"},"modified":"2023-12-23T15:36:17","modified_gmt":"2023-12-23T07:36:17","slug":"java-%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e5%ad%97%e7%ac%a6%e4%b8%b2\/","title":{"rendered":"Java \u5b57\u7b26\u4e32"},"content":{"rendered":"<p>Java\u5b57\u7b26\u4e32\u662f\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684\u7c7b\u4e4b\u4e00\u3002Java\u5b57\u7b26\u4e32\u7c7b\u7684\u5b9a\u4e49\u5728java.lang\u5305\u4e2d\u3002<\/p>\n<h2>Java \u5b57\u7b26\u4e32<\/h2>\n<ul class=\"post-ul\">\n<li>Basically, string is a sequence of characters but it\u2019s not a primitive type.<\/li>\n<li>When we create a string in java, it actually creates an object of type String.<\/li>\n<li>String is immutable object which means that it cannot be changed once it is created.<\/li>\n<li>String is the only class where operator overloading is supported in java. We can concat two strings using + operator. For example &#8220;a&#8221;+&#8221;b&#8221;=&#8221;ab&#8221;.<\/li>\n<li>Java provides two useful classes for String manipulation &#8211; StringBuffer and StringBuilder.<\/li>\n<\/ul>\n<p>\u8ba9\u6211\u4eec\u7ee7\u7eed\u6df1\u5165\u4e86\u89e3Java\u7684String\u7c7b\u5427\u3002<\/p>\n<h3>\u521b\u5efa\u5b57\u7b26\u4e32\u7684\u4e0d\u540c\u65b9\u6cd5<\/h3>\n<p>\u5728Java\u4e2d\uff0c\u6709\u8bb8\u591a\u79cd\u65b9\u6cd5\u53ef\u4ee5\u521b\u5efa\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n<ol>\u4f7f\u7528\u5b57\u7b26\u4e32\u6587\u5b57<br \/>\n\u8fd9\u662f\u521b\u5efa\u5b57\u7b26\u4e32\u7684\u6700\u5e38\u89c1\u65b9\u6cd5\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b57\u7b26\u4e32\u6587\u5b57\u7528\u53cc\u5f15\u53f7\u62ec\u8d77\u6765\u3002<br \/>\nString str = &#8220;abc&#8221;;<\/p>\n<p>\u5f53\u6211\u4eec\u4f7f\u7528\u53cc\u5f15\u53f7\u521b\u5efa\u5b57\u7b26\u4e32\u65f6\uff0cJVM\u4f1a\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\u67e5\u627e\u662f\u5426\u6709\u76f8\u540c\u503c\u7684\u5176\u4ed6\u5b57\u7b26\u4e32\u5b58\u50a8\u3002\u5982\u679c\u627e\u5230\u4e86\uff0c\u5b83\u53ea\u4f1a\u8fd4\u56de\u5bf9\u8be5\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5426\u5219\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u7ed9\u5b9a\u503c\u7684\u65b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\u3002<\/p>\n<p>\u4f7f\u7528new\u5173\u952e\u5b57<br \/>\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528new\u8fd0\u7b97\u7b26\u6765\u521b\u5efaString\u5bf9\u8c61\uff0c\u5c31\u50cf\u521b\u5efa\u4efb\u4f55\u666e\u901a\u7684java\u7c7b\u4e00\u6837\u3002String\u7c7b\u4e2d\u6709\u51e0\u4e2a\u6784\u9020\u51fd\u6570\u53ef\u7528\u4e8e\u4ecechar\u6570\u7ec4\u3001byte\u6570\u7ec4\u3001StringBuffer\u548cStringBuilder\u4e2d\u83b7\u53d6\u5b57\u7b26\u4e32\u3002<br \/>\nString str = new String(&#8220;abc&#8221;);<br \/>\nchar[] a = {&#8216;a&#8217;, &#8216;b&#8217;, &#8216;c&#8217;};<br \/>\nString str2 = new String(a);<\/ol>\n<h3>Java\u5b57\u7b26\u4e32\u6bd4\u8f83<\/h3>\n<p>String\u7c7b\u63d0\u4f9b\u4e86equals()\u548cequalsIgnoreCase()\u65b9\u6cd5\u6765\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u3002\u8fd9\u4e9b\u65b9\u6cd5\u4f1a\u6bd4\u8f83\u5b57\u7b26\u4e32\u7684\u503c\uff0c\u4ee5\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002\u5982\u679c\u4e24\u4e2a\u5b57\u7b26\u4e32\u76f8\u7b49\uff0c\u5219\u8fd4\u56detrue\uff1b\u5426\u5219\u8fd4\u56defalse\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.string.examples;\r\n\r\n\/**\r\n * Java String Example\r\n * \r\n * @author pankaj\r\n *\r\n *\/\r\npublic class StringEqualExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/creating two string object\r\n\t\tString s1 = \"abc\";\r\n\t\tString s2 = \"abc\";\r\n\t\tString s3 = \"def\";\r\n\t\tString s4 = \"ABC\";\r\n\t\t\r\n\t\tSystem.out.println(s1.equals(s2));\/\/true\r\n\t\tSystem.out.println(s2.equals(s3));\/\/false\r\n\t\t\r\n\t\tSystem.out.println(s1.equals(s4));\/\/false;\r\n\t\tSystem.out.println(s1.equalsIgnoreCase(s4));\/\/true\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>true\r\nfalse\r\nfalse\r\ntrue\r\n<\/code><\/pre>\n<p>\u5b57\u7b26\u4e32\u7c7b\u5b9e\u73b0\u4e86\u53ef\u6bd4\u8f83\u63a5\u53e3\uff0c\u63d0\u4f9b\u4e86compareTo()\u548ccompareToIgnoreCase()\u65b9\u6cd5\uff0c\u7528\u4e8e\u6309\u5b57\u5178\u987a\u5e8f\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u3002\u8fd9\u4e24\u4e2a\u5b57\u7b26\u4e32\u4f1a\u88ab\u8f6c\u6362\u4e3aUnicode\u503c\u8fdb\u884c\u6bd4\u8f83\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u503c\uff0c\u8be5\u503c\u53ef\u4ee5\u5927\u4e8e\u3001\u5c0f\u4e8e\u6216\u7b49\u4e8e\u96f6\u3002\u5982\u679c\u5b57\u7b26\u4e32\u76f8\u7b49\uff0c\u5219\u8fd4\u56de\u96f6\uff0c\u5426\u5219\u8fd4\u56de\u5927\u4e8e\u6216\u5c0f\u4e8e\u96f6\u7684\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.examples;\r\n\r\n\/**\r\n * Java String compareTo Example\r\n * \r\n * @author pankaj\r\n *\r\n *\/\r\npublic class StringCompareToExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString a1 = \"abc\";\r\n\t\tString a2 = \"abc\";\r\n\t\tString a3 = \"def\";\r\n\t\tString a4 = \"ABC\";\r\n\t\t\r\n\t\tSystem.out.println(a1.compareTo(a2));\/\/0\r\n\t\tSystem.out.println(a2.compareTo(a3));\/\/less than 0\r\n\t\tSystem.out.println(a1.compareTo(a4));\/\/greater than 0\r\n\t\tSystem.out.println(a1.compareToIgnoreCase(a4));\/\/0\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>0\r\n-3\r\n32\r\n0\r\n<\/code><\/pre>\n<p>\u8bf7\u66f4\u8be6\u7ec6\u5730\u9605\u8bfb\u5b57\u7b26\u4e32 compareTo \u793a\u4f8b\uff0c\u8be6\u7ec6\u5185\u5bb9\u8bf7\u53c2\u9605\u5b57\u7b26\u4e32 compareTo \u793a\u4f8b\u3002<\/p>\n<h3>Java\u5b57\u7b26\u4e32\u65b9\u6cd5<\/h3>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4e00\u4e9b\u5e38\u7528\u7684String\u7c7b\u65b9\u6cd5\uff0c\u5e76\u9644\u4e0a\u4e00\u4e2a\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n<ol>split()<br \/>\nJava String split()\u65b9\u6cd5\u7528\u4e8e\u4f7f\u7528\u7ed9\u5b9a\u7684\u8868\u8fbe\u5f0f\u62c6\u5206\u5b57\u7b26\u4e32\u3002split()\u65b9\u6cd5\u6709\u4e24\u4e2a\u53d8\u4f53\u3002<\/p>\n<p>split(String regex)\uff1a\u8be5\u65b9\u6cd5\u4f7f\u7528\u7ed9\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u62c6\u5206\u5b57\u7b26\u4e32\u5e76\u8fd4\u56de\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<br \/>\nsplit(String regex, int limit)\uff1a\u8be5\u65b9\u6cd5\u4f7f\u7528\u7ed9\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u62c6\u5206\u5b57\u7b26\u4e32\u5e76\u8fd4\u56de\u5b57\u7b26\u4e32\u6570\u7ec4\uff0c\u4f46\u6570\u7ec4\u7684\u5143\u7d20\u53d7\u6307\u5b9a\u9650\u5236\u9650\u5236\u3002\u5982\u679c\u6307\u5b9a\u7684\u9650\u5236\u4e3a2\uff0c\u5219\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5927\u5c0f\u4e3a2\u7684\u6570\u7ec4\u3002<\/p>\n<p>package com.Olivia.examples;<\/p>\n<p>\/**<br \/>\n* Java\u5b57\u7b26\u4e32\u62c6\u5206\u793a\u4f8b<br \/>\n*<br \/>\n* @author pankaj<br \/>\n*<br \/>\n*\/<br \/>\npublic class StringSplitExample {<\/p>\n<p>public static void main(String[] args) {<\/p>\n<p>String s = &#8220;a\/b\/c\/d&#8221;;<br \/>\nString[] a1 = s.split(&#8220;\/&#8221;);<br \/>\nSystem.out.println(&#8220;\u53ea\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u62c6\u5206\u5b57\u7b26\u4e32\uff1a&#8221;);<br \/>\nfor (String string : a1) {<br \/>\nSystem.out.println(string);<br \/>\n}<br \/>\nSystem.out.println(&#8220;\u4f7f\u7528\u5e26\u6709\u9650\u5236\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u62c6\u5206\u5b57\u7b26\u4e32\uff1a&#8221;);<br \/>\nString[] a2 = s.split(&#8220;\/&#8221;, 2);<br \/>\nfor (String string : a2) {<br \/>\nSystem.out.println(string);<br \/>\n}<br \/>\n}<\/p>\n<p>}<\/p>\n<p>\u4e0a\u9762\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<br \/>\n\u53ea\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u62c6\u5206\u5b57\u7b26\u4e32\uff1a<br \/>\na<br \/>\nb<br \/>\nc<br \/>\nd<br \/>\n\u4f7f\u7528\u5e26\u6709\u9650\u5236\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u62c6\u5206\u5b57\u7b26\u4e32\uff1a<br \/>\na<br \/>\nb\/c\/d<\/p>\n<p>contains(CharSequence s)<br \/>\nJava String contains()\u65b9\u6cd5\u7528\u4e8e\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u6307\u5b9a\u7684\u5b57\u7b26\u5e8f\u5217\u3002\u5982\u679c\u5b57\u7b26\u4e32\u5305\u542b\u6307\u5b9a\u7684\u5b57\u7b26\u5e8f\u5217\uff0c\u5219\u8be5\u65b9\u6cd5\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse\u3002<br \/>\npackage com.Olivia.examples;<\/p>\n<p>\/**<br \/>\n* Java\u5b57\u7b26\u4e32\u5305\u542b()\u793a\u4f8b<br \/>\n*<br \/>\n* @\u4f5c\u8005\uff1apankaj<br \/>\n*<br \/>\n*\/<br \/>\npublic class StringContainsExample {<\/p>\n<p>public static void main(String[] args) {<br \/>\nString s = &#8220;Hello World&#8221;;<\/p>\n<p>System.out.println(s.contains(&#8220;W&#8221;));\/\/true<br \/>\nSystem.out.println(s.contains(&#8220;X&#8221;));\/\/false<br \/>\n}<\/p>\n<p>}<\/p>\n<p>\u4e0a\u9762\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<br \/>\ntrue<br \/>\nfalse<\/p>\n<p>length()<br \/>\nJava String length()\u65b9\u6cd5\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<br \/>\npackage com.Olivia.examples;<\/p>\n<p>\/**<br \/>\n* Java\u5b57\u7b26\u4e32\u957f\u5ea6<br \/>\n*<br \/>\n* @\u4f5c\u8005\uff1apankaj<br \/>\n*<br \/>\n*\/<br \/>\npublic class StringLengthExample {<\/p>\n<p>public static void main(String[] args) {<\/p>\n<p>String s1 = &#8220;abc&#8221;;<br \/>\nString s2 = &#8220;abcdef&#8221;;<br \/>\nString s3 = &#8220;abcdefghi&#8221;;<\/p>\n<p>System.out.println(s1.length());\/\/3<br \/>\nSystem.out.println(s2.length());\/\/6<br \/>\nSystem.out.println(s3.length());\/\/9<\/p>\n<p>}<\/p>\n<p>}<\/p>\n<p>replace()<br \/>\nJava String replace()\u65b9\u6cd5\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u7684\u7279\u5b9a\u90e8\u5206\u66ff\u6362\u4e3a\u5176\u4ed6\u5b57\u7b26\u4e32\u3002replace()\u65b9\u6cd5\u6709\u56db\u4e2a\u53d8\u4f53\u3002<\/p>\n<p>replace(char oldChar, char newChar)\uff1a\u8be5\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u4e2doldChar\u7684\u6240\u6709\u51fa\u73b0\u90fd\u66ff\u6362\u4e3anewChar\u3002<br \/>\nreplace(CharSequence target, CharSequence replacement)\uff1a\u8be5\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e2a\u76ee\u6807\u6587\u672c\u66ff\u6362\u4e3a\u66ff\u6362\u6587\u672c\u3002<br \/>\nreplaceAll(String regex, String replacement)\uff1a\u8be5\u65b9\u6cd5\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u4e0e\u6307\u5b9a\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u7684\u6240\u6709\u5b50\u5b57\u7b26\u4e32\u4e0e\u6307\u5b9a\u66ff\u6362\u5b57\u7b26\u4e32\u3002<br \/>\nreplaceFirst(String regex, String replacement)\uff1a\u8be5\u65b9\u6cd5\u5c06\u4e0e\u6307\u5b9a\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u7684\u7b2c\u4e00\u4e2a\u5b50\u5b57\u7b26\u4e32\u66ff\u6362\u4e3a\u6307\u5b9a\u66ff\u6362\u5b57\u7b26\u4e32\u3002<\/p>\n<p>package com.Olivia.examples;<\/p>\n<p>\/**<br \/>\n* Java\u5b57\u7b26\u4e32\u66ff\u6362<br \/>\n*<br \/>\n* @\u4f5c\u8005\uff1apankaj<br \/>\n*<br \/>\n*\/<br \/>\npublic class StringReplaceExample {<\/p>\n<p>public static void main(String[] args) {<\/p>\n<p>\/\/replace(char oldChar,  char newChar)<br \/>\nString s = &#8220;Hello World&#8221;;<br \/>\ns = s.replace(&#8216;l&#8217;, &#8216;m&#8217;);<br \/>\nSystem.out.println(&#8220;\u5c06l\u66ff\u6362\u4e3am\u540e\u7684\u5b57\u7b26\u4e32\uff1a&#8221;);<br \/>\nSystem.out.println(s);<\/p>\n<p>\/\/replaceAll(String regex, String replacement)<br \/>\nString s1 = &#8220;Hello journaldev, Hello pankaj&#8221;;<br \/>\ns1 = s1.replaceAll(&#8220;Hello&#8221;, &#8220;Hi&#8221;);<br \/>\nSystem.out.println(&#8220;\u5c06Hello\u66ff\u6362\u4e3aHi\u540e\u7684\u5b57\u7b26\u4e32\uff1a&#8221;);<br \/>\nSystem.out.println(s1);<\/p>\n<p>\/\/replaceFirst(String regex, String replacement)<br \/>\nString s2 = &#8220;Hello guys, Hello world&#8221;;<br \/>\ns2 = s2.replaceFirst(&#8220;Hello&#8221;, &#8220;Hi&#8221;);<br \/>\nSystem.out.println(&#8220;\u5c06\u7b2c\u4e00\u4e2aHello\u66ff\u6362\u4e3aHi\u540e\u7684\u5b57\u7b26\u4e32\uff1a&#8221;);<br \/>\nSystem.out.println(s2);<\/p>\n<p>}<\/p>\n<p>}<\/p>\n<p>\u4e0a\u9762\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<br \/>\n\u5c06l\u66ff\u6362\u4e3am\u540e\u7684\u5b57\u7b26\u4e32\uff1a<br \/>\nHemmo Wormd<br \/>\n\u5c06Hello\u66ff\u6362\u4e3aHi\u540e\u7684\u5b57\u7b26\u4e32\uff1a<br \/>\nHi journaldev, Hi pankaj<br \/>\n\u5c06\u7b2c\u4e00\u4e2aHello\u66ff\u6362\u4e3aHi\u540e\u7684\u5b57\u7b26\u4e32\uff1a<br \/>\nHi guys, Hello world<\/p>\n<p>format()<br \/>\nJava Sting format()\u65b9\u6cd5\u7528\u4e8e\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3002java String format()\u65b9\u6cd5\u6709\u4e24\u4e2a\u53d8\u4f53\u3002<\/p>\n<p>format(Locale l, String format, Object\u2026 args)\uff1a\u8be5\u65b9\u6cd5\u4f7f\u7528\u6307\u5b9a\u7684\u4f4d\u7f6e\u3001\u5b57\u7b26\u4e32\u683c\u5f0f\u548c\u53c2\u6570\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3002<br \/>\nformat(String format, Object\u2026 args)\uff1a\u8be5\u65b9\u6cd5\u4f7f\u7528\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u548c\u53c2\u6570\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3002<\/p>\n<p>package com.Olivia.examples;<\/p>\n<p>import java.util.Locale;<\/p>\n<p>\/**<br \/>\n* Java\u5b57\u7b26\u4e32\u683c\u5f0f\u5316<br \/>\n*<br \/>\n* @\u4f5c\u8005\uff1apankaj<br \/>\n*<br \/>\n*\/<br \/>\npublic class StringFormatExample {<\/p>\n<p>public static void main(String[] args) {<\/p>\n<p>String s = &#8220;journaldev.com&#8221;;<br \/>\n\/\/ %s\u7528\u4e8e\u9644\u52a0\u5b57\u7b26\u4e32<br \/>\nSystem.out.println(String.format(&#8220;\u8fd9\u662f%s&#8221;, s));<\/p>\n<p>\/\/\u4f7f\u7528Locale.US\u4f5c\u4e3aLocale<br \/>\nSystem.out.println(String.format(Locale.US, &#8220;%f&#8221;, 3.14));<br \/>\n}<br \/>\n}<\/p>\n<p>\u4e0a\u9762\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<br \/>\n\u8fd9\u662fjournaldev.com<br \/>\n3.140000<\/p>\n<p>substring()<br \/>\n\u6b64\u65b9\u6cd5\u6839\u636e\u6307\u5b9a\u7684\u7d22\u5f15\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002<br \/>\npackage com.Olivia.examples;<\/p>\n<p>\/**<br \/>\n* Java\u5b57\u7b26\u4e32\u5b50\u5b57\u7b26\u4e32<br \/>\n*<br \/>\n*\/<br \/>\npublic class StringSubStringExample {<\/p>\n<p>public static void main(String[] args) {<\/p>\n<p>String s = &#8220;This is journaldev.com&#8221;;<br \/>\ns = s.substring(8,18);<br \/>\nSystem.out.println(s);<br \/>\n}<br \/>\n}<\/ol>\n<h3>\u5b57\u7b26\u4e32\u62fc\u63a5<\/h3>\n<p>\u5728Java\u4e2d\uff0c\u5b57\u7b26\u4e32\u62fc\u63a5\u662f\u975e\u5e38\u57fa\u672c\u7684\u64cd\u4f5c\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u201c+\u201d\u64cd\u4f5c\u7b26\u6216\u4f7f\u7528concat()\u65b9\u6cd5\u6765\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u62fc\u63a5\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.examples;\r\n\r\n\/**\r\n * Java String concatenation\r\n * \r\n * @author pankaj\r\n *\r\n *\/\r\npublic class StringConcatExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString s1 = \"Hello\";\r\n\t\tString s2 = \"World\";\r\n\t\tString s3 = s1 + s2;\r\n\t\t\/\/using + operator\r\n\t\tSystem.out.println(\"Using + operator: \");\r\n\t\tSystem.out.println(s3);\r\n\t\t\r\n\t\t\/\/using concat method\r\n\t\tSystem.out.println(\"Using concat method: \");\r\n\t\tSystem.out.println(s1.concat(s2));\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>Using + operator: \r\nHelloWorld\r\nUsing concat method: \r\nHelloWorld\r\n<\/code><\/pre>\n<p>\u8bf7\u67e5\u770b\u6b64\u5e16\u5b50\u4ee5\u83b7\u53d6\u66f4\u591a\u5173\u4e8eJava\u4e2d\u5b57\u7b26\u4e32\u62fc\u63a5\u7684\u4fe1\u606f\u3002<\/p>\n<h3>Java\u5b57\u7b26\u4e32\u6c60<\/h3>\n<p>\u5185\u5b58\u7ba1\u7406\u662f\u4efb\u4f55\u7f16\u7a0b\u8bed\u8a00\u4e2d\u6700\u91cd\u8981\u7684\u65b9\u9762\u3002\u5728Java\u4e2d\uff0c\u5b57\u7b26\u4e32\u7684\u5185\u5b58\u7ba1\u7406\u4e0e\u5176\u4ed6\u7c7b\u6709\u4e9b\u4e0d\u540c\u3002\u4e3a\u4e86\u4f7fJava\u66f4\u52a0\u5185\u5b58\u9ad8\u6548\uff0cJVM\u5f15\u5165\u4e86\u4e00\u4e2a\u7279\u6b8a\u7684\u5185\u5b58\u533a\u57df\uff0c\u79f0\u4e3a\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u3002\u5f53\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u6587\u5b57\u65f6\uff0c\u5b83\u4f1a\u68c0\u67e5\u5b57\u7b26\u4e32\u6c60\u4e2d\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u3002\u5982\u679c\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u5b57\u7b26\u4e32\u6c60\u4e2d\u73b0\u6709\u5b57\u7b26\u4e32\u7684\u5f15\u7528\u3002\u8ba9\u6211\u4eec\u6765\u770b\u770b\u4e0b\u9762\u7684\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.examples;\r\n\r\n\/**\r\n * Java String Pool Example\r\n * \r\n *\/\r\npublic class StringPoolExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString a = \"abc\";\r\n\t\tString b = \"abc\";\r\n\t\tString c = \"def\";\r\n\t\t\r\n\t\t\/\/same reference\r\n\t\tif (a==b) {\r\n\t\t\tSystem.out.println(\"Both string refer to the same object\");\r\n\t\t}\r\n\t\t\r\n\t\t\/\/different reference\r\n\t\tif (a==c) {\r\n\t\t\tSystem.out.println(\"Both strings refer to the same object\");\r\n\t\t}else {\r\n\t\t\tSystem.out.println(\"Both strings refer to the different object\");\r\n\t\t}\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>Both string refer to the same object\r\nBoth strings refer to the different object\r\n<\/code><\/pre>\n<p>\u8bf7\u9605\u8bfb\u8fd9\u7bc7\u6587\u7ae0\u4e86\u89e3\u6709\u5173Java\u5b57\u7b26\u4e32\u6c60\u7684\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n<h3>\u5b57\u7b26\u4e32\u7684intern()\u65b9\u6cd5<\/h3>\n<p>\u5f53\u6211\u4eec\u4f7f\u7528\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u65f6\uff0c\u5b83\u5c06\u88ab\u521b\u5efa\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\uff0c\u4f46\u662f\u5982\u679c\u6211\u4eec\u4f7f\u7528\u76f8\u540c\u7684\u503c\u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5b83\u4f1a\u600e\u6837\u5462\uff1f\u6211\u4eec\u80fd\u5c06\u5806\u5185\u5b58\u4e2d\u7684\u5b57\u7b26\u4e32\u79fb\u5230\u5b57\u7b26\u4e32\u6c60\u4e2d\u5417\uff1f\u4e3a\u6b64\uff0c\u53ef\u4ee5\u4f7f\u7528intern()\u65b9\u6cd5\uff0c\u5b83\u8fd4\u56de\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u89c4\u8303\u8868\u793a\u3002\u5f53\u6211\u4eec\u5728\u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u4e0a\u8c03\u7528intern()\u65b9\u6cd5\u65f6\uff0c\u5b83\u4f1a\u68c0\u67e5\u6c60\u4e2d\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u4e00\u4e2a\u5177\u6709\u76f8\u540c\u503c\u7684\u5b57\u7b26\u4e32\uff1f\u5982\u679c\u662f\uff0c\u5219\u4ece\u6c60\u4e2d\u8fd4\u56de\u8be5\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u5982\u679c\u6ca1\u6709\uff0c\u5219\u5728\u6c60\u4e2d\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u76f8\u540c\u5185\u5bb9\u7684\u65b0\u5b57\u7b26\u4e32\u5e76\u8fd4\u56de\u5f15\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.examples;\r\n\r\n\/**\r\n * Java String intern\r\n * \r\n * @author pankaj\r\n *\r\n *\/\r\npublic class StringInternExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\tString s1 = \"pankaj\";\r\n\t\tString s2 = \"pankaj\";\r\n\t\tString s3 = new String(\"pankaj\");\r\n\t\t\r\n\t\tSystem.out.println(s1==s2);\/\/true\r\n\t\tSystem.out.println(s2==s3);\/\/false\r\n\t\t\r\n\t\tString s4 = s3.intern();\r\n\t\tSystem.out.println(s1==s4);\/\/true\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u67e5\u770b\u6b64\u5e16\u5b50\u4ee5\u4e86\u89e3\u66f4\u591a\u5173\u4e8eJava String intern\u65b9\u6cd5\u7684\u4fe1\u606f\u3002<\/p>\n<h3>\u5b57\u7b26\u4e32\u7684\u4e0d\u53ef\u53d8\u6027\u7684\u597d\u5904<\/h3>\n<p>\u4e0d\u53ef\u53d8\u7c7bString\u7684\u4e00\u4e9b\u597d\u5904\u5305\u62ec\uff1a<\/p>\n<ol>\u5e38\u91cf\u6c60\uff0c\u4ece\u800c\u8282\u7701\u5185\u5b58\u3002<br \/>\n\u5b89\u5168\u6027\uff0c\u56e0\u4e3a\u5b83\u4e0d\u80fd\u88ab\u66f4\u6539\u3002<br \/>\n\u7ebf\u7a0b\u5b89\u5168\u3002<br \/>\n\u7c7b\u52a0\u8f7d\u7684\u5b89\u5168\u6027\u3002<\/ol>\n<p>\u70b9\u51fb\u8fd9\u7bc7\u5e16\u5b50\u4e86\u89e3\u66f4\u591a\u5173\u4e8eSting\u7684\u4e0d\u53ef\u53d8\u6027\u4f18\u52bf\u3002<\/p>\n<h2>Java 8 \u7684\u5b57\u7b26\u4e32 join() \u65b9\u6cd5<\/h2>\n<p>\u5728Java 8\u4e2d\uff0cString\u7c7b\u65b0\u589e\u4e86\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5join()\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7531CharSequence\u5143\u7d20\u7684\u526f\u672c\u7ec4\u5408\u800c\u6210\u7684\u65b0String\uff0c\u5e76\u4f7f\u7528\u6307\u5b9a\u7684\u5206\u9694\u7b26\u8fdb\u884c\u5206\u9694\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4f8b\u5b50\u6765\u66f4\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<pre class=\"post-pre\"><code>List&lt;String&gt; words = Arrays.asList(new String[]{\"Hello\", \"World\", \"2019\"});\r\nString msg = String.join(\" \", words);\r\nSystem.out.println(msg);\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a\u4f60\u597d\uff0c\u4e16\u754c2019\u3002<\/p>\n<h2>Java 9 \u5b57\u7b26\u4e32\u65b9\u6cd5<\/h2>\n<p>\u5728Java 9\u7248\u672c\u4e2d\uff0cString\u7c7b\u4e2d\u6dfb\u52a0\u4e86\u4e24\u79cd\u65b9\u6cd5: codePoints() \u548c chars()\u3002\u8fd9\u4e24\u79cd\u65b9\u6cd5\u90fd\u8fd4\u56deIntStream\u5bf9\u8c61\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u5176\u4e0a\u6267\u884c\u4e00\u4e9b\u64cd\u4f5c\u3002\u8ba9\u6211\u4eec\u5feb\u901f\u6d4f\u89c8\u4e00\u4e0b\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>String s = \"abc\";\r\n\r\ns.codePoints().forEach(x -&gt; System.out.println(x));\r\n\r\ns.chars().forEach(x -&gt; System.out.println(x));\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>97\r\n98\r\n99\r\n97\r\n98\r\n99\r\n<\/code><\/pre>\n<h2>Java 11 \u5b57\u7b26\u4e32\u7c7b\u7684\u65b0\u65b9\u6cd5<\/h2>\n<p>\u5728 Java 11 \u7248\u672c\u4e2d\uff0cString \u7c7b\u4e2d\u6dfb\u52a0\u4e86\u8bb8\u591a\u65b0\u7684\u65b9\u6cd5\u3002<\/p>\n<ul class=\"post-ul\">\n<li>isBlank() &#8211; returns true if the string is empty or contains only white space codepoints, otherwise false.<\/li>\n<li>lines() &#8211; returns a stream of lines extracted from this string, separated by line terminators.<\/li>\n<li>strip(), stripLeading(), stripTrailing() &#8211; for stripping leading and trailing white spaces from the string.<\/li>\n<li>repeat() &#8211; returns a string whose value is the concatenation of this string repeated given number of times.<\/li>\n<\/ul>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u5173\u4e8e\u8fd9\u4e9b\u65b9\u6cd5\u7684\u4e00\u4e2a\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.strings;\r\n\r\nimport java.util.List;\r\nimport java.util.stream.Collectors;\r\n\r\n\/**\r\n * JDK 11 New Functions in String class\r\n * \r\n * @author pankaj\r\n *\r\n *\/\r\npublic class JDK11StringFunctions {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ isBlank()\r\n\t\tString s = \"abc\";\r\n\t\tSystem.out.println(s.isBlank());\r\n\t\ts = \"\";\r\n\t\tSystem.out.println(s.isBlank());\r\n\r\n\t\t\/\/ lines()\r\n\t\tString s1 = \"Hi\\nHello\\rHowdy\";\r\n\t\tSystem.out.println(s1);\r\n\t\tList lines = s1.lines().collect(Collectors.toList());\r\n\t\tSystem.out.println(lines);\r\n\r\n\t\t\/\/ strip(), stripLeading(), stripTrailing()\r\n\t\tString s2 = \"  Java,  \\tPython\\t \";\r\n\t\tSystem.out.println(\"#\" + s2 + \"#\");\r\n\t\tSystem.out.println(\"#\" + s2.strip() + \"#\");\r\n\t\tSystem.out.println(\"#\" + s2.stripLeading() + \"#\");\r\n\t\tSystem.out.println(\"#\" + s2.stripTrailing() + \"#\");\r\n\r\n\t\t\/\/ repeat()\r\n\t\tString s3 = \"Hello\\n\";\r\n\t\tSystem.out.println(s3.repeat(3));\r\n\t\ts3 = \"Co\";\r\n\t\tSystem.out.println(s3.repeat(2));\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>false\r\ntrue\r\nHi\r\nHello\r\nHowdy\r\n[Hi, Hello, Howdy]\r\n#  Java,  \tPython\t #\r\n#Java,  \tPython#\r\n#Java,  \tPython\t #\r\n#  Java,  \tPython#\r\nHello\r\nHello\r\nHello\r\n\r\nCoCo\r\n<\/code><\/pre>\n<p>\u8fd9\u5c31\u662f\u5173\u4e8eJava String\u7c7b\u7684\u6240\u6709\u5185\u5bb9\uff0c\u5305\u62ec\u5b83\u7684\u65b9\u6cd5\u548c\u5b57\u7b26\u4e32\u64cd\u4f5c\u793a\u4f8b\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u4ed3\u5e93\u4e2d\u67e5\u770b\u66f4\u591a\u6709\u5173\u5b57\u7b26\u4e32\u7684\u4f8b\u5b50\u3002<\/p>\n<p>\u53c2\u8003\u6587\u6863\uff1aAPI\u6587\u6863<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u5b57\u7b26\u4e32\u662f\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684\u7c7b\u4e4b\u4e00\u3002Java\u5b57\u7b26\u4e32\u7c7b\u7684\u5b9a\u4e49\u5728java.lang\u5305\u4e2d\u3002 Java \u5b57\u7b26\u4e32 Bas [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50722","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java \u5b57\u7b26\u4e32 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u5b57\u7b26\u4e32\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u5b57\u7b26\u4e32\" \/>\n<meta property=\"og:description\" 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