{"id":183,"date":"2023-11-27T02:19:41","date_gmt":"2023-07-16T16:34:45","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98%e5%8f%8a%e7%ad%94%e6%a1%88\/"},"modified":"2025-08-01T02:04:03","modified_gmt":"2025-07-31T18:04:03","slug":"java%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98%e5%8f%8a%e7%ad%94%e6%a1%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98%e5%8f%8a%e7%ad%94%e6%a1%88\/","title":{"rendered":"Java\u5b57\u7b26\u4e32\u9762\u8bd5\u7cbe\u8bb2\uff1a\u5e38\u89c1\u95ee\u9898\u4e0e\u9ad8\u5206\u7b54\u6848\u89e3\u6790"},"content":{"rendered":"<h3>\u7b80\u4ecb<\/h3>\n<p>\u5b57\u7b26\u4e32\u662fJava\u7c7b\u4e2d\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u7c7b\u578b\u4e4b\u4e00\u3002\u672c\u6587\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5173\u4e8e\u5b57\u7b26\u4e32\u7684\u7ec3\u4e60\u95ee\u9898\u548c\u7b54\u6848\uff0c\u65e8\u5728\u5e2e\u52a9\u60a8\u4e3a\u9762\u8bd5\u505a\u597d\u51c6\u5907\u3002<\/p>\n<p>\u60a8\u8fd8\u53ef\u4ee5\u5c1d\u8bd5<a href=\"#\" title=\"Java\u5b57\u7b26\u4e32\u6d4b\u9a8c\">Java\u5b57\u7b26\u4e32\u6d4b\u9a8c<\/a>\uff0c\u4ee5\u6d4b\u8bd5\u60a8\u5bf9\u5b57\u7b26\u4e32\u7c7b\u7684\u7406\u89e3\u3002<\/p>\n<h2>Java\u4e2d\u7684String\u7c7b\u662f\u4ec0\u4e48\uff1fString\u662f\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u5417\uff1f<\/h2>\n<p>String\u662fJava\u4e2d\u7684\u4e00\u4e2a\u7c7b\uff0c\u5b9a\u4e49\u5728<code>java.lang<\/code>\u5305\u4e2d\u3002\u5b83\u4e0d\u662f\u50cf<code>int<\/code>\u548c<code>long<\/code>\u90a3\u6837\u7684\u539f\u59cb\u6570\u636e\u7c7b\u578b\u3002<code>String<\/code>\u7c7b\u7528\u4e8e\u8868\u793a\u5b57\u7b26\u4e32\u3002\u5b57\u7b26\u4e32\u51e0\u4e4e\u5728\u6240\u6709\u7684Java\u5e94\u7528\u7a0b\u5e8f\u4e2d\u90fd\u88ab\u4f7f\u7528\u3002\u5728Java\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff08immutable\uff09\u548c\u6700\u7ec8\u7684\uff08final\uff09\uff0c\u5e76\u4e14JVM\u4f7f\u7528\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff08String Pool\uff09\u6765\u5b58\u50a8\u6240\u6709\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u53cc\u5f15\u53f7\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u5e76\u4e14<code>+<\/code>\u8fd0\u7b97\u7b26\u53ef\u4ee5\u88ab\u91cd\u8f7d\u7528\u4e8e\u5b57\u7b26\u4e32\u8fde\u63a5\u3002<\/p>\n<h2>\u5728Java\u4e2d\u6709\u54ea\u4e9b\u4e0d\u540c\u7684\u65b9\u6cd5\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2aString\u5bf9\u8c61\uff1f<\/h2>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528<code>new<\/code>\u8fd0\u7b97\u7b26\u521b\u5efa\u4e00\u4e2a<code>String<\/code>\u5bf9\u8c61\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u53cc\u5f15\u53f7\u521b\u5efa\u4e00\u4e2a<code>String<\/code>\u5bf9\u8c61\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> str <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">String<\/span> str1 <span class=\"token operator\">=<\/span> <span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<p><code>String<\/code>\u7c7b\u63d0\u4f9b\u4e86\u591a\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4ece\u5b57\u7b26\u6570\u7ec4\u3001\u5b57\u8282\u6570\u7ec4\u3001<code>StringBuffer<\/code>\u548c<code>StringBuilder<\/code>\u4e2d\u83b7\u53d6\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n<p>\u5f53\u4f7f\u7528\u53cc\u5f15\u53f7\u521b\u5efa\u5b57\u7b26\u4e32\u65f6\uff0cJVM\u4f1a\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u67e5\u627e\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u5177\u6709\u76f8\u540c\u503c\u7684\u5176\u4ed6\u5b57\u7b26\u4e32\u3002\u5982\u679c\u5b57\u7b26\u4e32\u5df2\u7ecf\u5b58\u50a8\u5728\u6c60\u4e2d\uff0cJVM\u4f1a\u8fd4\u56de\u5bf9\u8be5\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u5982\u679c\u65b0\u5b57\u7b26\u4e32\u4e0d\u5728\u6c60\u4e2d\uff0cJVM\u4f1a\u521b\u5efa\u4e00\u4e2a\u5177\u6709\u7ed9\u5b9a\u503c\u7684\u65b0\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u3002\u5f53\u4f7f\u7528<code>new<\/code>\u8fd0\u7b97\u7b26\u65f6\uff0cJVM\u4f1a\u521b\u5efa\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u4f46\u4e0d\u4f1a\u5c06\u5176\u5b58\u50a8\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528<code>intern()<\/code>\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u5bf9\u8c61\u5b58\u50a8\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\uff0c\u6216\u8005\u5982\u679c\u6c60\u4e2d\u5df2\u7ecf\u5b58\u5728\u76f8\u7b49\u503c\u7684\u5b57\u7b26\u4e32\uff0c\u5219\u8fd4\u56de\u5bf9\u5176\u5f15\u7528\u3002<\/p>\n<h2>\u7f16\u5199\u4e00\u4e2aJava\u65b9\u6cd5\u6765\u68c0\u67e5\u8f93\u5165\u5b57\u7b26\u4e32\u662f\u5426\u662f\u56de\u6587\u3002<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u5b57\u7b26\u4e32\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51716\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5728\u53cd\u8f6c\u540e\u4e0e\u539f\u59cb\u503c\u76f8\u540c\uff0c\u90a3\u4e48\u5b83\u5c31\u662f\u4e00\u4e2a<strong>\u56de\u6587\u4e32<\/strong>\u3002\u4f8b\u5982\uff0c<code>aba<\/code> \u5c31\u662f\u4e00\u4e2a\u56de\u6587\u4e32\u3002<code>String<\/code> \u7c7b\u6ca1\u6709\u63d0\u4f9b\u4efb\u4f55\u65b9\u6cd5\u6765\u53cd\u8f6c\u5b57\u7b26\u4e32\uff0c\u4f46\u662f <code>StringBuffer<\/code> \u548c <code>StringBuilder<\/code> \u7c7b\u6709\u4e00\u4e2a <code>reverse()<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u662f\u4e00\u4e2a\u56de\u6587\u4e32\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">isPalindrome<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>str <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token class-name\">StringBuilder<\/span> strBuilder <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StringBuilder<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    strBuilder<span class=\"token punctuation\">.<\/span><span class=\"token function\">reverse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> strBuilder<span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6709\u65f6\u5019\uff0c\u9762\u8bd5\u5b98\u53ef\u80fd\u8981\u6c42\u4f60\u4e0d\u4f7f\u7528\u4efb\u4f55\u5176\u4ed6\u7c7b\u6765\u68c0\u67e5\u662f\u5426\u4e3a\u56de\u6587\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u4ee5\u4ece\u5b57\u7b26\u4e32\u4e24\u7aef\u6bd4\u8f83\u5b57\u7b26\uff0c\u4ee5\u786e\u5b9a\u5176\u662f\u5426\u4e3a\u56de\u6587\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">isPalindromeString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>str <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">int<\/span> length <span class=\"token operator\">=<\/span> str<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>length <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> length <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">++<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n         <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!=<\/span> str<span class=\"token punctuation\">.<\/span><span class=\"token function\">charAt<\/span><span class=\"token punctuation\">(<\/span>length <span class=\"token operator\">-<\/span> i <span class=\"token operator\">-<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7f16\u5199\u4e00\u4e2aJava\u65b9\u6cd5\uff0c\u5c06\u4ece\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\u4e2d\u5220\u9664\u7ed9\u5b9a\u7684\u5b57\u7b26\u3002<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u5b57\u7b26\u4e32\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51716\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 `replaceAll` \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u6240\u6709\u51fa\u73b0\u66ff\u6362\u4e3a\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u9700\u8981\u6ce8\u610f\u7684\u91cd\u8981\u4e00\u70b9\u662f\uff0c`replaceAll()` \u63a5\u53d7\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528 `Character` \u7c7b\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5e76\u5c06\u5176\u7528\u4f5c\u5c06\u6240\u6709\u5b57\u7b26\u66ff\u6362\u4e3a\u7a7a\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">removeChar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> str<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> c<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>str <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> str<span class=\"token punctuation\">.<\/span><span class=\"token function\">replaceAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5728Java\u4e2d\uff0c\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u6216\u5c0f\u5199\uff1f<\/h2>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528 `String` \u7c7b\u7684 `toUpperCase` \u548c `toLowerCase` \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5168\u5927\u5199\u6216\u5168\u5c0f\u5199\u3002\u8fd9\u4e9b\u65b9\u6cd5\u6709\u4e00\u4e2a\u63a5\u53d7 `Locale` \u53c2\u6570\u7684\u53d8\u4f53\uff0c\u5b83\u4f1a\u4f7f\u7528\u7ed9\u5b9a\u533a\u57df\u8bbe\u7f6e\u7684\u89c4\u5219\u6765\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u6216\u5c0f\u5199\u3002<\/p>\n<h2>\u5b57\u7b26\u4e32\u7684 `subSequence` \u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>Java 1.4 \u5f15\u5165\u4e86 `CharSequence` \u63a5\u53e3\uff0c\u5e76\u4e14 `String` \u7c7b\u5b9e\u73b0\u4e86\u8fd9\u4e2a\u63a5\u53e3\uff0c\u56e0\u6b64 `String` \u7c7b\u62e5\u6709\u4e86 `subSequence` \u65b9\u6cd5\u3002\u5728\u5185\u90e8\uff0c`subSequence` \u65b9\u6cd5\u8c03\u7528\u4e86 `String` \u7684 `substring` \u65b9\u6cd5\u3002<\/p>\n<h2>\u5728Java\u7a0b\u5e8f\u4e2d\uff0c\u5982\u4f55\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\uff1f<\/h2>\n<p>Java\u5b57\u7b26\u4e32\u5b9e\u73b0\u4e86 `Comparable` \u63a5\u53e3\uff0c\u5b83\u6709\u4e24\u4e2a `compareTo()` \u65b9\u6cd5\u7684\u53d8\u4f53\u3002<\/p>\n<ul>\n<li>`compareTo(String anotherString)` \u65b9\u6cd5\u662f\u57fa\u4e8e\u5b57\u5178\u987a\u5e8f\u6bd4\u8f83 `String` \u5bf9\u8c61\u548c\u4f20\u5165\u7684 `String` \u53c2\u6570\u3002\u5982\u679c `String` \u5bf9\u8c61\u5728\u53c2\u6570\u4e4b\u524d\uff0c\u5b83\u8fd4\u56de\u4e00\u4e2a\u8d1f\u6574\u6570\uff1b\u5982\u679c `String` \u5bf9\u8c61\u5728\u53c2\u6570\u4e4b\u540e\uff0c\u5b83\u8fd4\u56de\u4e00\u4e2a\u6b63\u6574\u6570\uff1b\u5f53\u4e24\u4e2a `String` \u5bf9\u8c61\u7684\u503c\u76f8\u540c\u65f6\uff0c\u8fd4\u56de0\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c`equals(String str)` \u65b9\u6cd5\u4e5f\u8fd4\u56de `true`\u3002<\/li>\n<li>`compareToIgnoreCase(String str)` \u65b9\u6cd5\u4e0e\u7b2c\u4e00\u4e2a\u65b9\u6cd5\u7c7b\u4f3c\uff0c\u4f46\u5ffd\u7565\u5927\u5c0f\u5199\u3002\u5b83\u4f7f\u7528 `Comparator` \u548c `CASE_INSENSITIVE_ORDER` \u8fdb\u884c\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684\u6bd4\u8f83\u3002\u5982\u679c\u8fd4\u56de\u503c\u4e3a0\uff0c\u5219 `equalsIgnoreCase(String str)` \u4e5f\u5c06\u8fd4\u56de `true`\u3002<\/li>\n<\/ul>\n<h2>\u5728Java\u4e2d\uff0c\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u7b26\u6570\u7ec4\uff1f<\/h2>\n<p>\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\u662f\u4e00\u4e2a\u5b57\u7b26\u5e8f\u5217\uff0c\u6240\u4ee5\u65e0\u6cd5\u5c06\u5176\u8f6c\u6362\u4e3a\u5355\u4e2a\u5b57\u7b26\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 `charAt` \u65b9\u6cd5\u83b7\u53d6\u7ed9\u5b9a\u7d22\u5f15\u5904\u7684\u5b57\u7b26\uff0c\u6216\u8005\u53ef\u4ee5\u4f7f\u7528 `toCharArray()` \u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u7b26\u6570\u7ec4\u3002\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u7b26\u6570\u7ec4\u7684\u4fe1\u606f\u3002<\/p>\n<h2>\u5728Java\u4e2d\uff0c\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u8282\u6570\u7ec4\uff1f<\/h2>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528 `getBytes()` \u65b9\u6cd5\u5c06 `String` \u5bf9\u8c61\u8f6c\u6362\u6210\u5b57\u8282\u6570\u7ec4\uff0c\u5e76\u4e14\u4f60\u53ef\u4ee5\u4f7f\u7528\u6784\u9020\u51fd\u6570 `new String(byte[] arr)` \u5c06\u5b57\u8282\u6570\u7ec4\u8f6c\u6362\u6210 `String` \u5bf9\u8c61\u3002\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u5b57\u8282\u6570\u7ec4\u7684\u65b9\u6cd5\u3002<\/p>\n<h2>\u5728Java\u4e2d\uff0c\u4f60\u80fd\u5728 `switch case` \u8bed\u53e5\u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\u5417\uff1f<\/h2>\n<p>Java 7 \u589e\u5f3a\u4e86\u5bf9\u5b57\u7b26\u4e32\u7684 `switch case` \u80fd\u529b\uff0c\u4e4b\u524d\u7684Java\u7248\u672c\u4e0d\u652f\u6301\u6b64\u529f\u80fd\u3002\u5982\u679c\u4f60\u9700\u8981\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u6761\u4ef6\u6d41\u7a0b\u63a7\u5236\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 `if-else` \u6761\u4ef6\u8bed\u53e5\uff0c\u800c\u5982\u679c\u4f60\u4f7f\u7528\u7684\u662fJava 7\u6216\u66f4\u9ad8\u7248\u672c\uff0c\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528 `switch case` \u8bed\u53e5\u3002\u4e86\u89e3\u66f4\u591a\u5173\u4e8eJava `switch case` \u5b57\u7b26\u4e32\u7684\u77e5\u8bc6\u3002<\/p>\n<h2>\u7f16\u5199\u4e00\u4e2aJava\u7a0b\u5e8f\uff0c\u6253\u5370\u51fa\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u6240\u6709\u6392\u5217\u3002<\/h2>\n<p>\u4f60\u9700\u8981\u4f7f\u7528\u9012\u5f52\u6765\u627e\u51fa\u5b57\u7b26\u4e32\u7684\u6240\u6709\u6392\u5217\u3002\u4f8b\u5982\uff0c\u5b57\u7b26\u4e32 AAB \u7684\u6392\u5217\u6709 AAB\u3001ABA \u548c BAA\u3002\u4f60\u8fd8\u9700\u8981\u4f7f\u7528\u96c6\u5408 `Set` \u6765\u786e\u4fdd\u6ca1\u6709\u91cd\u590d\u7684\u503c\u3002\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u627e\u5230\u5b57\u7b26\u4e32\u7684\u6240\u6709\u6392\u5217\u7684\u77e5\u8bc6\u3002<\/p>\n<h2>\u7528Java\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\uff0c\u5728\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u4e2d\u627e\u5230\u6700\u957f\u7684\u56de\u6587\u3002<\/h2>\n<p>\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u53ef\u4ee5\u5305\u542b\u56de\u6587\u5b50\u4e32\u3002\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u5982\u4f55\u627e\u5230\u6700\u957f\u56de\u6587\u5b50\u4e32\u7684\u65b9\u6cd5\u3002<\/p>\n<h2>Java\u4e2d\u7684 `String`\u3001`StringBuffer` \u548c `StringBuilder` \u6709\u54ea\u4e9b\u533a\u522b\uff1f<\/h2>\n<p>\u5728Java\u4e2d\uff0c\u5b57\u7b26\u4e32\u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\u548c\u6700\u7ec8\u7684\uff0c\u6240\u4ee5\u6bcf\u5f53\u4f60\u64cd\u4f5c\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\u65f6\uff0c\u5b83\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002\u5b57\u7b26\u4e32\u64cd\u4f5c\u662f\u6d88\u8017\u8d44\u6e90\u7684\uff0c\u56e0\u6b64Java\u63d0\u4f9b\u4e86\u4e24\u4e2a\u7528\u4e8e\u5b57\u7b26\u4e32\u64cd\u4f5c\u7684\u5b9e\u7528\u7c7b\uff1a`StringBuffer` \u548c `StringBuilder`\u3002<\/p>\n<p>`StringBuffer` \u548c `StringBuilder` \u662f\u53ef\u53d8\u7684\u7c7b\u3002`StringBuffer` \u7684\u64cd\u4f5c\u662f\u7ebf\u7a0b\u5b89\u5168\u4e14\u540c\u6b65\u7684\uff0c\u800c `StringBuilder` \u7684\u64cd\u4f5c\u5219\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5e94\u8be5\u4f7f\u7528 `StringBuffer`\uff0c\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u5e94\u8be5\u4f7f\u7528 `StringBuilder`\u3002`StringBuilder` \u7684\u6027\u80fd\u66f4\u5feb\uff0c\u56e0\u4e3a\u6ca1\u6709\u540c\u6b65\u7684\u5f00\u9500\u3002<\/p>\n<p>\u4e86\u89e3\u66f4\u591a\u5173\u4e8e `String`\u3001`StringBuffer` \u548c `StringBuilder` \u4e4b\u95f4\u7684\u533a\u522b\uff0c\u4ee5\u53ca `StringBuffer` \u548c `StringBuilder` \u7684\u57fa\u51c6\u6d4b\u8bd5\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u5728Java\u4e2d `String` \u662f\u4e0d\u53ef\u53d8\u7684\uff1f<\/h2>\n<p>Java\u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u8fd9\u5e26\u6765\u4e86\u51e0\u4e2a\u597d\u5904\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u7531\u4e8e `String` \u5728Java\u4e2d\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u56e0\u6b64\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff08String pool\uff09\u6210\u4e3a\u53ef\u80fd\u3002<\/li>\n<li>\u5b83\u589e\u52a0\u4e86\u5b89\u5168\u6027\uff0c\u56e0\u4e3a\u4efb\u4f55\u653b\u51fb\u8005\u90fd\u65e0\u6cd5\u6539\u53d8\u5176\u503c\uff0c\u5e76\u4e14\u5b83\u7528\u4e8e\u5b58\u50a8\u654f\u611f\u4fe1\u606f\uff0c\u4f8b\u5982\u6570\u636e\u5e93\u7528\u6237\u540d\u6216\u5bc6\u7801\u3002<\/li>\n<li>\u7531\u4e8e `String` \u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u56e0\u6b64\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528\u662f\u5b89\u5168\u7684\uff0c\u5e76\u4e14\u4e0d\u9700\u8981\u4efb\u4f55\u540c\u6b65\u3002<\/li>\n<li>\u5b57\u7b26\u4e32\u5728Java\u7c7b\u52a0\u8f7d\u5668\u4e2d\u4f7f\u7528\uff0c\u4e0d\u53ef\u53d8\u6027\u786e\u4fdd\u4e86 `ClassLoader` \u7c7b\u52a0\u8f7d\u7684\u662f\u6b63\u786e\u7684\u7c7b\u3002<\/li>\n<\/ul>\n<p>\u4e86\u89e3\u4e00\u4e0b\u4e3a\u4ec0\u4e48\u5728Java\u4e2d `String` \u662f\u4e0d\u53ef\u53d8\u7684\u3002<\/p>\n<h2>\u5728Java\u4e2d\u5982\u4f55\u5206\u5272\u5b57\u7b26\u4e32\uff1f<\/h2>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528 `split(String regex)` \u6839\u636e\u63d0\u4f9b\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u5c06\u5b57\u7b26\u4e32\u5206\u5272\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u5728Java\u4e2d\uff0c\u7528\u5b57\u7b26\u6570\u7ec4\u6765\u5b58\u50a8\u5bc6\u7801\u6bd4\u5b57\u7b26\u4e32\u66f4\u53d7\u9752\u7750\uff1f<\/h2>\n<p>Java\u4e2d\u7684 `String` \u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5e76\u5b58\u50a8\u5728\u5b57\u7b26\u4e32\u6c60\u4e2d\u3002\u4e00\u65e6\u521b\u5efa\uff0c\u5b83\u4f1a\u4e00\u76f4\u4fdd\u7559\u5728\u6c60\u4e2d\uff0c\u76f4\u5230\u5783\u573e\u56de\u6536\u5b8c\u6210\uff0c\u56e0\u6b64\u5373\u4f7f\u60a8\u4f7f\u7528\u5bc6\u7801\u5b8c\u6bd5\uff0c\u5b83\u4ecd\u7136\u5728\u5185\u5b58\u4e2d\u53ef\u7528\u66f4\u957f\u65f6\u95f4\u3002\u8fd9\u662f\u4e00\u4e2a\u5b89\u5168\u98ce\u9669\uff0c\u56e0\u4e3a\u4efb\u4f55\u53ef\u4ee5\u8bbf\u95ee\u5185\u5b58\u8f6c\u50a8\u7684\u4eba\u90fd\u53ef\u4ee5\u4ee5\u660e\u6587\u5f62\u5f0f\u627e\u5230\u5bc6\u7801\u3002\u5982\u679c\u60a8\u4f7f\u7528\u5b57\u7b26\u6570\u7ec4\u6765\u5b58\u50a8\u5bc6\u7801\uff0c\u60a8\u53ef\u4ee5\u5728\u4f7f\u7528\u5b8c\u6bd5\u540e\u5c06\u5176\u8bbe\u7f6e\u4e3a\u7a7a\u3002\u60a8\u53ef\u4ee5\u63a7\u5236\u5b83\u5728\u5185\u5b58\u4e2d\u53ef\u7528\u7684\u65f6\u95f4\u957f\u5ea6\uff0c\u4ece\u800c\u907f\u514d\u5b89\u5168\u5a01\u80c1\u3002<\/p>\n<h2>\u5728Java\u4e2d\uff0c\u5982\u4f55\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\uff1f<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u5b57\u7b26\u4e32\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\u300b\u7684\u7b2c4\u90e8\u5206\uff08\u51716\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: \u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u6709\u4e24\u79cd\u65b9\u6cd5\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528\u201c==\u201d\u8fd0\u7b97\u7b26\u6216\u8005`equals()`\u65b9\u6cd5\u3002\u5f53\u4f60\u4f7f\u7528\u201c==\u201d\u8fd0\u7b97\u7b26\u65f6\uff0c\u5b83\u4f1a\u68c0\u67e5\u5b57\u7b26\u4e32\u7684\u503c\u4ee5\u53ca\u5bf9\u8c61\u5f15\u7528\u3002\u5728Java\u7f16\u7a0b\u4e2d\uff0c\u901a\u5e38\u4f60\u53ea\u60f3\u68c0\u67e5\u5b57\u7b26\u4e32\u7684\u503c\u662f\u5426\u76f8\u7b49\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f60\u5e94\u8be5\u4f7f\u7528`equals()`\u65b9\u6cd5\u6765\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49\u3002\u8fd8\u6709\u4e00\u4e2a\u540d\u4e3a`equalsIgnoreCase()`\u7684\u51fd\u6570\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u5ffd\u7565\u5927\u5c0f\u5199\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">=<\/span> <span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">=<\/span> <span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token class-name\">String<\/span> s3 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"s1 == s2 ? \"<\/span> <span class=\"token operator\">+<\/span> <span class=\"token punctuation\">(<\/span>s1 <span class=\"token operator\">==<\/span> s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/true<\/span>\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"s1 == s3 ? \"<\/span> <span class=\"token operator\">+<\/span> <span class=\"token punctuation\">(<\/span>s1 <span class=\"token operator\">==<\/span> s3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/false<\/span>\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"s1 equals s3 ? \"<\/span> <span class=\"token operator\">+<\/span> <span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>s3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/true<\/span>\r\n<\/code><\/pre>\n<h2>Java\u4e2d\u7684\u5b57\u7b26\u4e32\u6c60\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u5b57\u7b26\u4e32\u6c60\uff08String Pool\uff09\u662f\u5b58\u50a8\u5728Java\u5806\u5185\u5b58\u4e2d\u7684`String`\u5bf9\u8c61\u6c60\u3002\u5728Java\u4e2d\uff0c`String`\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u7c7b\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528`new`\u8fd0\u7b97\u7b26\u521b\u5efa\u4e00\u4e2a`String`\u5bf9\u8c61\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u53cc\u5f15\u53f7\u63d0\u4f9b\u503c\u6765\u521b\u5efa\u4e00\u4e2a`String`\u5bf9\u8c61\u3002\u4e86\u89e3\u66f4\u591a\u5173\u4e8eJava\u5b57\u7b26\u4e32\u6c60\u7684\u4fe1\u606f\u3002<\/p>\n<h2>Java\u7684`String intern()`\u65b9\u6cd5\u662f\u7528\u6765\u505a\u4ec0\u4e48\u7684\uff1f<\/h2>\n<p>\u5f53\u8c03\u7528`intern()`\u65b9\u6cd5\u65f6\uff0c\u5982\u679c\u5b57\u7b26\u4e32\u6c60\u4e2d\u5df2\u7ecf\u5305\u542b\u4e00\u4e2a\u4e0e\u8be5`String`\u5bf9\u8c61\u5185\u5bb9\u76f8\u7b49\uff08\u901a\u8fc7`equals(Object)`\u65b9\u6cd5\u786e\u5b9a\uff09\u7684`String`\u5bf9\u8c61\uff0c\u5219\u8fd4\u56de\u6c60\u4e2d\u7684\u5b57\u7b26\u4e32\u5f15\u7528\u3002\u5426\u5219\uff0c\u5c06\u8be5`String`\u5bf9\u8c61\u6dfb\u52a0\u5230\u6c60\u4e2d\uff0c\u5e76\u8fd4\u56de\u5bf9\u8be5`String`\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u8be5\u65b9\u6cd5\u59cb\u7ec8\u8fd4\u56de\u4e00\u4e2a\u5177\u6709\u4e0e\u8be5`String`\u76f8\u540c\u5185\u5bb9\u4f46\u4fdd\u8bc1\u6765\u81ea\u552f\u4e00\u5b57\u7b26\u4e32\u6c60\u7684`String`\u5bf9\u8c61\u3002<\/p>\n<h2>\u5728Java\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u5426\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff1f<\/h2>\n<p>\u4e00\u4e2a`String`\u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\uff08immutable\uff09\uff0c\u6240\u4ee5\u5728\u521b\u5efa\u540e\u65e0\u6cd5\u6539\u53d8\u5b83\u7684\u503c\u3002\u8fd9\u4f7f\u5f97`String`\u5bf9\u8c61\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u6b64\u53ef\u4ee5\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u5b89\u5168\u5730\u4f7f\u7528\u5b83\u3002\u5728Java\u4e2d\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7ebf\u7a0b\u5b89\u5168\u6027\u7684\u77e5\u8bc6\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u5728Java\u4e2d\uff0c\u5b57\u7b26\u4e32\u53d8\u91cf\u4f5c\u4e3aHashMap\u7684\u952e\u975e\u5e38\u53d7\u6b22\u8fce\uff1f<\/h2>\n<p>\u7531\u4e8e`String`\u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u6240\u4ee5\u5b83\u7684\u54c8\u5e0c\u7801\u5728\u521b\u5efa\u65f6\u88ab\u7f13\u5b58\uff0c\u4e0d\u9700\u8981\u91cd\u65b0\u8ba1\u7b97\u3002\u8fd9\u4f7f\u5f97\u5b83\u6210\u4e3a`Map`\u4e2d\u7406\u60f3\u7684\u952e\u9009\u9879\uff0c\u56e0\u4e3a\u5b83\u7684\u5904\u7406\u901f\u5ea6\u6bd4\u5176\u4ed6`HashMap`\u952e\u5bf9\u8c61\u66f4\u5feb\u3002<\/p>\n<h2>\u731c\u6d4b\u8f93\u51fa<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u5b57\u7b26\u4e32\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\u300b\u7684\u7b2c5\u90e8\u5206\uff08\u51716\u90e8\u5206\uff09\u3002<\/p>\n<p>\u901a\u8fc7\u731c\u6d4b\u4ee5\u4e0bJava\u4ee3\u7801\u6bb5\u7684\u8f93\u51fa\u6765\u8fdb\u884c\u81ea\u6211\u6d4b\u8bd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">StringTest<\/span> <span class=\"token punctuation\">{\r\n    \r\n  \t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n   \t\t<span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"digitalocean\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n   \t\t<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"DIGITALOCEAN\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n   \t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s1 <span class=\"token operator\">=<\/span> s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n   \t}<\/span>\r\n    \r\n}<\/span>\r\n<\/code><\/pre>\n<details>\n<summary>\u8f93\u51fa<\/summary>\n<p><code>DIGITALOCEAN<\/code><\/p>\n<p>\u7531\u4e8e\u4ee3\u7801\u5c06 <code>String s2<\/code> \u7684\u503c\u8d4b\u7ed9 <code>String s1<\/code>\uff0c\u56e0\u6b64\u8f93\u51fa\u7ed3\u679c\u4e3a <code>DIGITALOCEAN<\/code>\u3002<code>=<\/code> \u662f\u4e00\u4e2a\u8d4b\u503c\u8fd0\u7b97\u7b26\uff0c\u5c06 <code>y<\/code> \u7684\u503c\u8d4b\u7ed9 <code>x<\/code>\uff0c\u5176\u683c\u5f0f\u4e3a <code>(x = y)<\/code>\u3002<code>==<\/code> \u662f\u4e00\u4e2a\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff0c\u4f1a\u68c0\u67e5\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u5f15\u7528\u5bf9\u8c61\u662f\u5426\u76f8\u540c\u3002<\/p>\n<\/details>\n<hr \/>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Test<\/span> <span class=\"token punctuation\">{\r\n    \r\n   \t <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">foo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n   \t <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"String\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n   \t }<\/span>\r\n    \r\n   \t <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">foo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">StringBuffer<\/span> sb<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n   \t <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"StringBuffer\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n   \t }<\/span>\r\n    \r\n   \t <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n   \t\t<span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">foo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n   \t}<\/span>\r\n    \r\n}<\/span>\r\n<\/code><\/pre>\n<details>\n<summary>\u8f93\u51fa<\/summary>\n<p><code>Test.java:12: \u9519\u8bef\uff1afoo\u7684\u5f15\u7528\u4e0d\u660e\u786e<\/code><\/p>\n<p><code>new Test().foo(null);<\/code><\/p>\n<p><code>^<\/code><\/p>\n<p><code>Test<\/code> \u7c7b\u4e2d\u7684 <code>foo(String)<\/code> \u65b9\u6cd5\u548c <code>foo(StringBuffer)<\/code> \u65b9\u6cd5\u90fd\u5339\u914d\u3002\u8fd9\u6bb5\u4ee3\u7801\u5728\u7f16\u8bd1\u65f6\u4ea7\u751f\u4e86\u9519\u8bef\uff0c\u56e0\u4e3a\u4e24\u4e2a <code>foo<\/code> \u65b9\u6cd5\u5177\u6709\u76f8\u540c\u7684\u540d\u79f0\uff0c\u5728 <code>main<\/code> \u65b9\u6cd5\u4e2d\u8c03\u7528 <code>foo<\/code> \u65b9\u6cd5\u65f6\u4f20\u9012\u4e86 <code>null<\/code> \u53c2\u6570\u3002\u7f16\u8bd1\u5668\u4e0d\u77e5\u9053\u5e94\u8be5\u8c03\u7528\u54ea\u4e2a\u65b9\u6cd5\u3002\u4f60\u4e5f\u53ef\u4ee5\u53c2\u8003\u201c\u65b9\u6cd5X\u5bf9\u7c7b\u578bY\u662f\u4e0d\u660e\u786e\u7684\u201d\u9519\u8bef\u3002<\/p>\n<\/details>\n<hr \/>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s1 <span class=\"token operator\">==<\/span> s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<details>\n<summary>\u8f93\u51fa<\/summary>\n<p><code>false<\/code><\/p>\n<p>\u8f93\u51fa\u4e3a <code>false<\/code>\uff0c\u56e0\u4e3a\u4ee3\u7801\u4f7f\u7528 <code>new<\/code> \u8fd0\u7b97\u7b26\u521b\u5efa\u4e86 <code>String<\/code> \u5bf9\u8c61\uff0c\u6240\u4ee5\u5b83\u4eec\u88ab\u521b\u5efa\u5728\u5806\u5185\u5b58\u4e2d\uff0c<code>s1<\/code> \u548c <code>s2<\/code> \u5c06\u6709\u4e0d\u540c\u7684\u5f15\u7528\u3002\u5982\u679c\u53ea\u4f7f\u7528\u53cc\u5f15\u53f7\u521b\u5efa\u5b57\u7b26\u4e32\uff0c\u5219\u5b83\u4eec\u5c06\u4f4d\u4e8e\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\uff0c\u8f93\u51fa\u4e3a <code>true<\/code>\u3002<\/p>\n<\/details>\n<hr \/>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">=<\/span> <span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">;\r\n<span class=\"token class-name\">StringBuffer<\/span> s2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StringBuffer<\/span><span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<details>\n<summary>\u8f93\u51fa<\/summary>\n<p><code>false<\/code><\/p>\n<p>\u8f93\u51fa\u4e3a <code>false<\/code> \u662f\u56e0\u4e3a <code>s2<\/code> \u4e0d\u662f <code>String<\/code> \u7c7b\u578b\u3002<code>String<\/code> \u7c7b\u4e2d\u7684 <code>equals()<\/code> \u65b9\u6cd5\u5b9e\u73b0\u4e2d\u4f7f\u7528\u4e86 <code>instanceof<\/code> \u8fd0\u7b97\u7b26\u6765\u68c0\u67e5\u4f20\u5165\u5bf9\u8c61\u7684\u7c7b\u578b\u662f\u5426\u4e3a <code>String<\/code>\uff0c\u5e76\u5728\u5bf9\u8c61\u4e0d\u662f <code>String<\/code> \u7c7b\u578b\u65f6\u8fd4\u56de <code>false<\/code>\u3002<\/p>\n<\/details>\n<hr \/>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">=<\/span> <span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">;\r\n<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"abc\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\ns2<span class=\"token punctuation\">.<\/span><span class=\"token function\">intern<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s1 <span class=\"token operator\">==<\/span> s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<details>\n<summary>\u8f93\u51fa<\/summary>\n<p><code>false<\/code><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u4e3a <code>false<\/code>\u3002<code>intern()<\/code> \u65b9\u6cd5\u4ece\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u8fd4\u56de <code>String<\/code> \u5bf9\u8c61\u5f15\u7528\u3002\u7136\u800c\uff0c\u4ee3\u7801\u6ca1\u6709\u5c06\u5176\u8d4b\u503c\u56de <code>s2<\/code>\uff0c\u56e0\u6b64 <code>s2<\/code> \u6ca1\u6709\u6539\u53d8\uff0c\u5e76\u4e14 <code>s1<\/code> \u548c <code>s2<\/code> \u5177\u6709\u4e0d\u540c\u7684\u5bf9\u8c61\u5f15\u7528\u3002\u5982\u679c\u5c06\u7b2c3\u884c\u7684\u4ee3\u7801\u66f4\u6539\u4e3a <code>s2 = s2.intern();<\/code>\uff0c\u5219\u8f93\u51fa\u7ed3\u679c\u5c06\u4e3a <code>true<\/code>\u3002<\/p>\n<\/details>\n<h2>\u4ee5\u4e0b\u4ee3\u7801\u521b\u5efa\u4e86\u591a\u5c11\u4e2aString\u5bf9\u8c61\uff1f<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u5b57\u7b26\u4e32\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\u300b\u7684\u7b2c6\u90e8\u5206\uff08\u51716\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Hello\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  \r\n<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Hello\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<details>\n<summary>\u7b54\u6848\u89e3\u6790<\/summary>\n<p>\u7b54\u6848\u662f\u4e09\u4e2a\u5bf9\u8c61\u3002<\/p>\n<p>\u7b2c\u4e00\u884c\u4ee3\u7801 <code>String s1 = new String(\"Hello\");<\/code> \u4f1a\u521b\u5efa\u4e24\u4e2a\u5bf9\u8c61\uff1a<\/p>\n<ol>\n<li>\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u521b\u5efa\u4e00\u4e2a\u503c\u4e3a\u201cHello\u201d\u7684<code>String<\/code>\u5bf9\u8c61\uff08\u5982\u679c\u6c60\u4e2d\u4e0d\u5b58\u5728\uff09\u3002<\/li>\n<li>\u5728\u5806\u5185\u5b58\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684<code>String<\/code>\u5bf9\u8c61\uff0c\u5176\u5185\u5bb9\u4e3a\u201cHello\u201d\uff0c\u5e76\u5c06\u5176\u5f15\u7528\u8d4b\u7ed9<code>s1<\/code>\u3002<\/li>\n<\/ol>\n<p>\u7b2c\u4e8c\u884c\u4ee3\u7801 <code>String s2 = new String(\"Hello\");<\/code> \u4f1a\u521b\u5efa\u7b2c\u4e09\u4e2a\u5bf9\u8c61\uff1a<\/p>\n<ol>\n<li>\u5728\u5806\u5185\u5b58\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684<code>String<\/code>\u5bf9\u8c61\uff0c\u5176\u5185\u5bb9\u4e3a\u201cHello\u201d\uff0c\u5e76\u5c06\u5176\u5f15\u7528\u8d4b\u7ed9<code>s2<\/code>\u3002\u6b64\u65f6\uff0c\u5b83\u4f1a\u590d\u7528\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u5df2\u5b58\u5728\u7684\u201cHello\u201d\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u3002<\/li>\n<\/ol>\n<\/details>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u901a\u8fc7\u672c\u6587\uff0c\u60a8\u56de\u987e\u5e76\u89e3\u7b54\u4e86\u4e00\u4e9b\u5173\u4e8e<code>String<\/code>\u7684Java\u9762\u8bd5\u5e38\u89c1\u95ee\u9898\u3002<\/p>\n<h3>\u63a8\u8350\u9605\u8bfb\uff1a<\/h3>\n<ul>\n<li><a href=\"#\" rel=\"noopener noreferrer\">Java\u7f16\u7a0b\u95ee\u9898<\/a><\/li>\n<li><a href=\"#\" rel=\"noopener noreferrer\">Java\u4e2d\u7684\u5b57\u7b26\u4e32\u7a0b\u5e8f<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u4ecb \u5b57\u7b26\u4e32\u662fJava\u7c7b\u4e2d\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u7c7b\u578b\u4e4b\u4e00\u3002\u672c\u6587\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5173\u4e8e\u5b57\u7b26\u4e32\u7684\u7ec3\u4e60\u95ee\u9898\u548c\u7b54\u6848\uff0c\u65e8\u5728\u5e2e\u52a9\u60a8\u4e3a\u9762\u8bd5\u505a\u597d [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[183,744,243,745,746],"class_list":{"0":"post-183","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","9":"tag-243","10":"tag-745","11":"tag-746"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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property=\"og:title\" content=\"Java\u5b57\u7b26\u4e32\u9762\u8bd5\u7cbe\u8bb2\uff1a\u5e38\u89c1\u95ee\u9898\u4e0e\u9ad8\u5206\u7b54\u6848\u89e3\u6790\" \/>\n<meta property=\"og:description\" content=\"\u51c6\u5907Java\u9762\u8bd5\uff1f\u672c\u6587\u6df1\u5165\u89e3\u6790Java\u5b57\u7b26\u4e32\u9762\u8bd5\u4e2d\u7684\u5e38\u89c1\u95ee\u9898\uff0c\u63d0\u4f9b\u8be6\u7ec6\u7684\u7b54\u6848\u548c\u4ee3\u7801\u793a\u4f8b\uff0c\u52a9\u4f60\u8f7b\u677e\u5e94\u5bf9\u9762\u8bd5\u6311\u6218\uff0c\u638c\u63e1\u5b57\u7b26\u4e32\u6838\u5fc3\u77e5\u8bc6\u70b9\uff0c\u63d0\u5347\u9762\u8bd5\u6210\u529f\u7387\uff01\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u5b57\u7b26\u4e32\u9762\u8bd5\u95ee\u9898\u53ca\u7b54\u6848\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-16T16:34:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-31T18:04:03+00:00\" 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