{"id":203685,"date":"2025-05-22T08:09:03","date_gmt":"2025-05-22T00:09:03","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203685\/"},"modified":"2025-05-22T08:09:03","modified_gmt":"2025-05-22T00:09:03","slug":"%e5%ad%97%e7%ac%a6%e4%b8%b2%ef%bc%9a%e7%90%86%e8%a7%a3%e5%8f%af%e5%8f%98%e6%80%a7%e5%92%8c%e4%b8%8d%e5%8f%98%e6%80%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203685\/","title":{"rendered":"\u5b57\u7b26\u4e32\uff1a\u7406\u89e3\u53ef\u53d8\u6027\u548c\u4e0d\u53d8\u6027"},"content":{"rendered":"

<\/b> <\/p>\n

\u5b57\u7b26\u4e32\uff1a\u7406\u89e3\u53ef\u53d8\u6027\u548c\u4e0d\u53d8\u6027<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\u300a\u5b57\u7b26\u4e32\uff1a\u7406\u89e3\u53ef\u53d8\u6027\u548c\u4e0d\u53d8\u6027\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n

<\/p>\n

\u5728 java \u4e2d\uff0c\u5b57\u7b26\u4e32\u7ecf\u5e38\u5728\u5e94\u7528\u7a0b\u5e8f\u4e4b\u95f4\u8fdb\u884c\u64cd\u4f5c\u3001\u7ec4\u5408\u548c\u5b58\u50a8\uff0c\u56e0\u6b64\u4e86\u89e3 immutable<\/strong> \u548c mutable<\/strong> \u5b57\u7b26\u4e32\u5904\u7406\u4e4b\u95f4\u7684\u533a\u522b\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6548\u7684\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002\u8fd9\u7bc7\u6587\u7ae0\u63a2\u8ba8\u4e86 java \u5b57\u7b26\u4e32\u4e2d\u53ef\u53d8\u6027\u548c\u4e0d\u53ef\u53d8\u6027\u7684\u6982\u5ff5\uff0c\u6df1\u5165\u63a2\u8ba8\u4e86\u4e3a\u4ec0\u4e48 java \u63d0\u4f9b\u4e86\u4e0d\u540c\u7684\u7c7b\uff0c\u5982 string\u3001stringbuilder \u548c stringbuffer\u3002<\/p>\n

\n

1. java\u4e2d\u5b57\u7b26\u4e32\u7684\u4e0d\u53ef\u53d8\u6027 <\/h3>\n

\u5728java\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684<\/strong>\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u521b\u5efa\u4e86string\u5bf9\u8c61\uff0c\u5b83\u7684\u503c\u5c31\u65e0\u6cd5\u66f4\u6539\u3002\u6b64\u5c5e\u6027\u5bf9\u4e8e\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u7684\u5b89\u5168\u6027\u3001\u6027\u80fd\u548c\u5185\u5b58\u6548\u7387\u800c\u8a00\u662f\u6709\u76ca\u7684\u3002\u4e0d\u53d8\u6027\u786e\u4fdd\uff1a<\/p>\n

    \n
  • \n

    \u4e00\u81f4\u6027<\/strong>\uff1a\u4e00\u65e6\u7ed9\u5b57\u7b26\u4e32\u8d4b\u503c\uff0c\u5b83\u5c31\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n<\/li>\n

  • \n

    \u7ebf\u7a0b\u5b89\u5168<\/strong>\uff1a\u591a\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u5b89\u5168\u5730\u4f7f\u7528\u540c\u4e00\u4e2a string \u5b9e\u4f8b\uff0c\u65e0\u9700\u540c\u6b65\u3002<\/p>\n<\/li>\n

  • \n

    \u5185\u5b58\u6548\u7387<\/strong>\uff1ajava\u6709\u4e00\u4e2a\u5185\u90e8\u5b57\u7b26\u4e32\u6c60<\/strong>\u6765\u6709\u6548\u5730\u7ba1\u7406string\u5bf9\u8c61\u3002\u8be5\u6c60\u5b58\u50a8\u6bcf\u4e2a\u6587\u5b57\u5b57\u7b26\u4e32\u7684\u5355\u4e2a\u526f\u672c\uff0c\u5e76\u5c3d\u53ef\u80fd\u91cd\u7528\u5b83\u3002<\/p>\n<\/li>\n<\/ul>\n

    \u793a\u4f8b\uff1a<\/strong><\/p>\n

    string greeting = \"hello\";\ngreeting = greeting + \" world\";  \/\/ a new string object is created\nsystem.out.println(greeting);  \/\/ output: hello world\n<\/pre>\n
    \u5728\u793a\u4f8b\u4e2d\uff0c\u8fde\u63a5\u201cworld\u201d\u4e0d\u4f1a\u4fee\u6539\u539f\u59cb\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\u3002\u5728\u5904\u7406\u91cd\u590d\u4fee\u6539\u65f6\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u80fd\u4f1a\u53d8\u5f97\u4f4e\u6548\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u4f1a\u770b\u5230\u3002<\/p>\n
    \n
     2. \u5728\u53ef\u53d8\u573a\u666f\u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\uff1a\u7f3a\u70b9 <\/h3>\n
    \u867d\u7136 string \u7684\u4e0d\u53d8\u6027\u662f\u4e00\u4e2a\u5f88\u6709\u4ef7\u503c\u7684\u7279\u6027\uff0c\u4f46\u5982\u679c\u5728\u9700\u8981\u9891\u7e41\u4fee\u6539\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u5b83\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5185\u5b58\u548c\u6027\u80fd\u95ee\u9898\u3002\u6bcf\u6b21\u66f4\u6539 string \u65f6\uff0c\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0c\u8fd9\u4f1a\u589e\u52a0\u5185\u5b58\u4f7f\u7528\u91cf\u5e76\u589e\u52a0\u5783\u573e\u6536\u96c6\u5668\u7684\u538b\u529b\u3002<\/p>\n
    \u8003\u8651\u8fd9\u4e2a\u5b57\u6bcd\u4e32\u8054\u7684\u4f8b\u5b50\uff1a<\/p>\n
    private string alphabetconcat() {\n    string series = \"\";\n    for (int i = 0; i < 26; i++) {\n        series += (char) ('a' + i);\n        system.out.println(series); \/\/ outputs: a ab abc abcd ...\n    }\n    return series;\n}\n<\/pre>\n
    \u8bf4\u660e\uff1a<\/strong><\/p>\n
    \u7531\u4e8e string \u7684\u4e0d\u53d8\u6027\uff0c\u6bcf\u6b21\u8fed\u4ee3\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 string \u5bf9\u8c61\uff0c\u56e0\u6b64\uff0c\u8be5\u4ee3\u7801\u8fd0\u884c\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n^2)\uff0c\u6548\u7387\u6781\u4f4e\u3002 <\/p>\n
    \u6b64\u5916\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4f1a\u5bfc\u81f4\u5185\u5b58\u6548\u7387\u4f4e\u4e0b<\/strong>\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u4e2d\u95f4 string \u5bf9\u8c61\u90fd\u5355\u72ec\u5b58\u50a8\u5728\u5806\u4e2d\u3002\u8fd9\u4e9b\u672a\u4f7f\u7528\u7684\u5bf9\u8c61\u4f1a\u7d2f\u79ef\u5e76\u5bfc\u81f4\u5783\u573e\u6536\u96c6\u5f00\u9500\u589e\u52a0\u3002<\/p>\n
    \n
     3. \u53ef\u53d8\u66ff\u4ee3\u54c1\uff1astringbuilder \u548c stringbuffer <\/h3>\n
    java \u63d0\u4f9b\u4e86\u53ef\u53d8<\/strong>\u66ff\u4ee3\u65b9\u6848\uff0c\u4f8b\u5982 stringbuilder \u548c stringbuffer \u6765\u5904\u7406\u5b57\u7b26\u4e32\u9891\u7e41\u4fee\u6539\u7684\u60c5\u51b5\u3002<\/p>\n
     \u4f7f\u7528 stringbuilder \u5b9e\u73b0\u9ad8\u6548\u7684\u53ef\u53d8\u6027 <\/h4>\n
    stringbuilder \u662f\u4e00\u4e2a\u53ef\u53d8\u7c7b\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u5141\u8bb8\u5c31\u5730\u4fee\u6539\u5b57\u7b26\u4e32\u3002\u8fd9\u901a\u8fc7\u907f\u514d\u521b\u5efa\u4e2d\u95f4\u5bf9\u8c61\u6765\u63d0\u9ad8\u6027\u80fd\uff0c\u4f7f\u5176\u6210\u4e3a\u6d89\u53ca\u5927\u91cf\u5b57\u7b26\u4e32\u64cd\u4f5c\u7684\u573a\u666f\u7684\u7406\u60f3\u9009\u62e9\u3002\u8fd9\u662f\u6211\u4eec\u4e4b\u524d\u793a\u4f8b\u4e2d\u7684\u5de5\u4f5c\u539f\u7406\uff1a<\/p>\n
    private String alphabetConcat() {\n    StringBuilder series = new StringBuilder();\n    for (int i = 0; i < 26; i++) {\n        series.append((char) ('a' + i));\n        System.out.println(series); \/\/ Outputs: a ab abc abcd ...\n    }\n    return series.toString();\n}\n<\/pre>\n
    \u8fd9\u91cc\uff0cstringbuilder \u5728\u6574\u4e2a\u5faa\u73af\u4e2d\u4fee\u6539\u540c\u4e00\u4e2a\u5bf9\u8c61<\/strong>\uff0c\u5bfc\u81f4\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a o(n)\uff0c\u4f7f\u5176\u6548\u7387\u8fdc\u9ad8\u4e8e string\u3002<\/p>\n
    \n
     \u9700\u8981\u8bb0\u4f4f\u7684\u8981\u70b9 <\/h3>\n
      \n
    • \n
      \u5b57\u7b26\u4e32\u4e0d\u53ef\u53d8<\/strong>\u5e76\u7531\u5b57\u7b26\u4e32\u6c60<\/strong>\u652f\u6301\u4ee5\u5b9e\u73b0\u5185\u5b58\u4f18\u5316\u3002<\/p>\n<\/li>\n
    • \n
      stringbuilder \u548c stringbuffer \u662f\u53ef\u53d8\u7684<\/strong>\u3002 stringbuilder \u901f\u5ea6\u66f4\u5feb\uff0c\u4f46\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168<\/strong>\uff0c\u800c stringbuffer \u662f\u540c\u6b65\u4e14\u7ebf\u7a0b\u5b89\u5168<\/strong>\u3002<\/p>\n<\/li>\n
    • \n
      \u5728\u5355\u7ebf\u7a0b\u573a\u666f<\/strong>\u4e2d\u4f7f\u7528stringbuilder\u4e14\u9700\u8981\u9891\u7e41\u4fee\u6539\u3002<\/p>\n<\/li>\n
    • \n
      \u5f53\u9700\u8981\u4e0d\u53d8\u6027<\/strong>\u6216\u671f\u671b\u6700\u5c0f\u4fee\u6539\u65f6\u4f7f\u7528\u5b57\u7b26\u4e32\u3002<\/p>\n<\/li>\n<\/ul>\n
      \n
       \u7ed3\u8bba <\/h2>\n
      \u8fd9\u7bc7\u6587\u7ae0\u4e3a\u7406\u89e3\u4f55\u65f6\u6839\u636e\u53ef\u53d8\u6027\u548c\u6548\u7387\u4f7f\u7528 string\u3001stringbuilder \u6216 stringbuffer \u5960\u5b9a\u4e86\u57fa\u7840\u3002\u5728\u63a5\u4e0b\u6765\u7684\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8 stringbuilder \u548c stringbuffer \u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u63a2\u7d22\u7ebf\u7a0b\u5b89\u5168\u548c\u5e76\u53d1\u573a\u666f\u3002<\/p>\n
      \n
       \u76f8\u5173\u5e16\u5b50 <\/h2>\n
        \n
      • java \u57fa\u7840\u77e5\u8bc6<\/li>\n
      • \u6570\u7ec4\u9762\u8bd5\u8981\u70b9<\/li>\n
      • java \u5185\u5b58\u8981\u70b9<\/li>\n
      • java \u5173\u952e\u5b57\u8981\u70b9<\/li>\n
      • java oop \u57fa\u7840\u77e5\u8bc6<\/li>\n
      • \u96c6\u5408\u6846\u67b6\u8981\u70b9<\/li>\n<\/ul>\n
        \u7f16\u7801\u5feb\u4e50\uff01<\/p>\n
        \u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5b57\u7b26\u4e32\uff1a\u7406\u89e3\u53ef\u53d8\u6027\u548c\u4e0d\u53d8\u6027\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n
              \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u5b57\u7b26\u4e32\uff1a\u7406\u89e3\u53ef\u53d8\u6027\u548c\u4e0d\u53d8\u6027 \u6536\u85cf...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203685","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203685","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203685"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203685\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203685"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203685"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}