{"id":200,"date":"2024-01-02T22:14:56","date_gmt":"2024-01-02T14:14:56","guid":{"rendered":"https:\/\/wangqianming.top\/?p=200"},"modified":"2024-01-02T22:37:57","modified_gmt":"2024-01-02T14:37:57","slug":"java%e7%9a%84string","status":"publish","type":"post","link":"https:\/\/wangqianming.top\/index.php\/2024\/01\/02\/java%e7%9a%84string\/","title":{"rendered":"Java\u7684String"},"content":{"rendered":"

\u603b\u7ed3Java\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\u548c\u65b9\u6cd5<\/h1>\n

Java\u4e2d\u7684String<\/code>\u3001StringBuilder<\/code>\u548cStringBuffer<\/code>\u662f\u5904\u7406\u5b57\u7b26\u4e32\u7684\u4e09\u79cd\u4e3b\u8981\u65b9\u5f0f\uff0c\u5b83\u4eec\u5404\u6709\u7279\u70b9\u548c\u9002\u7528\u573a\u666f\u3002<\/p>\n

    \n
  1. \n

    String<\/strong>:<\/p>\n

      \n
    • String<\/code> \u5728 Java \u4e2d\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u521b\u5efa\u4e86\u4e00\u4e2a String<\/code> \u5bf9\u8c61\uff0c\u5c31\u4e0d\u80fd\u66f4\u6539\u5b83\u3002<\/li>\n
    • \u6bcf\u6b21\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u4fee\u6539\u65f6\uff0c\u5b9e\u9645\u4e0a\u90fd\u662f\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684 String<\/code> \u5bf9\u8c61\u3002<\/li>\n
    • \u7531\u4e8e\u5176\u4e0d\u53ef\u53d8\u6027\uff0cString<\/code> \u7c7b\u578b\u7684\u64cd\u4f5c\uff08\u5982\u62fc\u63a5\u3001\u66ff\u6362\u7b49\uff09\u901a\u5e38\u6bd4 StringBuilder<\/code> \u548c StringBuffer<\/code> \u6162\u3002<\/li>\n
    • String<\/code> \u7c7b\u578b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u4e3a\u5b83\u7684\u4e0d\u53ef\u53d8\u6027\u786e\u4fdd\u4e86\u591a\u7ebf\u7a0b\u4e0b\u7684\u4e00\u81f4\u6027\u3002<\/li>\n
    • \u9002\u7528\u573a\u666f\uff1a\u9002\u5408\u5b57\u7b26\u4e32\u8f83\u5c11\u6539\u52a8\u7684\u573a\u666f\uff0c\u5982\u5e38\u91cf\u58f0\u660e\u6216\u8bfb\u53d6\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \n

      StringBuilder<\/strong>:<\/p>\n

        \n
      • StringBuilder<\/code> \u662f\u53ef\u53d8\u7684\uff0c\u5141\u8bb8\u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u5e76\u5728\u4ee5\u540e\u4fee\u6539\u5b83\u3002<\/li>\n
      • \u63d0\u4f9b\u4e86\u5404\u79cd\u65b9\u6cd5\u6765\u6267\u884c\u5b57\u7b26\u4e32\u64cd\u4f5c\uff0c\u5982\u6dfb\u52a0\uff08append\uff09\u3001\u5220\u9664\uff08delete\uff09\u3001\u63d2\u5165\uff08insert\uff09\u7b49\u3002<\/li>\n
      • StringBuilder<\/code> \u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u8fd9\u610f\u5473\u7740\u5728\u5e76\u53d1\u73af\u5883\u4e0b\uff0c\u6ca1\u6709\u540c\u6b65\u63aa\u65bd\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/li>\n
      • \u7531\u4e8e\u7f3a\u4e4f\u7ebf\u7a0b\u5b89\u5168\u673a\u5236\uff0c\u5b83\u901a\u5e38\u6bd4 StringBuffer<\/code> \u66f4\u5feb\u3002<\/li>\n
      • \u9002\u7528\u573a\u666f\uff1a\u9002\u5408\u5355\u7ebf\u7a0b\u73af\u5883\u4e2d\u9700\u8981\u5927\u91cf\u4fee\u6539\u5b57\u7b26\u4e32\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n<\/li>\n
      • \n

        StringBuffer<\/strong>:<\/p>\n

          \n
        • StringBuffer<\/code> \u4e5f\u662f\u53ef\u53d8\u7684\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e0e StringBuilder<\/code> \u76f8\u4f3c\u7684\u65b9\u6cd5\u3002<\/li>\n
        • \u4e0e StringBuilder<\/code> \u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\uff0cStringBuffer<\/code> \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u5b83\u7684\u5927\u591a\u6570\u65b9\u6cd5\u90fd\u662f\u540c\u6b65\u7684\u3002<\/li>\n
        • \u8fd9\u79cd\u7ebf\u7a0b\u5b89\u5168\u901a\u5e38\u4f1a\u5e26\u6765\u6027\u80fd\u4e0a\u7684\u5f00\u9500\uff0c\u56e0\u6b64 StringBuffer<\/code> \u64cd\u4f5c\u6bd4 StringBuilder<\/code> \u6162\u3002<\/li>\n
        • \u9002\u7528\u573a\u666f\uff1a\u9002\u5408\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u9700\u8981\u5927\u91cf\u4fee\u6539\u5b57\u7b26\u4e32\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

          \u603b\u7ed3\u8d77\u6765\uff0c\u5982\u679c\u4f60\u9700\u8981\u4e0d\u53ef\u53d8\u7684\u5b57\u7b26\u4e32\uff0c\u5e94\u8be5\u4f7f\u7528 String<\/code>\uff1b\u5982\u679c\u662f\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u9700\u8981\u53ef\u53d8\u5b57\u7b26\u4e32\uff0c\u5e94\u8be5\u4f7f\u7528 StringBuilder<\/code>\uff1b\u800c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u9700\u8981\u53ef\u53d8\u5b57\u7b26\u4e32\u65f6\uff0c\u5e94\u8be5\u4f7f\u7528 StringBuffer<\/code>\u3002\u9009\u62e9\u5408\u9002\u7684\u7c7b\u578b\u53ef\u4ee5\u4f18\u5316\u6027\u80fd\u5e76\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n

          \u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e9b String<\/code> \u548c StringBuilder<\/code> \u5728 Java \u4e2d\u7684\u5e38\u7528\u65b9\u6cd5\uff0c\u5e76\u901a\u8fc7\u793a\u4f8b\u6765\u89e3\u91ca\u5b83\u4eec\u7684\u7528\u6cd5\u3002<\/p>\n

          String \u5e38\u7528\u65b9\u6cd5<\/h3>\n
            \n
          1. \n

            length()<\/strong><\/p>\n

              \n
            • \u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/li>\n
            • \u793a\u4f8b\uff1aString s = "Hello"; int len = s.length(); \/\/ len is 5<\/code><\/li>\n<\/ul>\n<\/li>\n
            • \n

              charAt(int index)<\/strong><\/p>\n

                \n
              • \u8fd4\u56de\u6307\u5b9a\u7d22\u5f15\u5904\u7684\u5b57\u7b26\u3002<\/li>\n
              • \u793a\u4f8b\uff1achar ch = s.charAt(0); \/\/ ch is 'H'<\/code><\/li>\n<\/ul>\n<\/li>\n
              • \n

                substring(int beginIndex, int endIndex)<\/strong><\/p>\n

                  \n
                • \u8fd4\u56de\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\uff0c\u5b83\u662f\u6b64\u5b57\u7b26\u4e32\u7684\u4e00\u4e2a\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n
                • \u793a\u4f8b\uff1aString sub = s.substring(1, 4); \/\/ sub is "ell"<\/code><\/li>\n<\/ul>\n<\/li>\n
                • \n

                  concat(String str)<\/strong><\/p>\n

                    \n
                  • \u5c06\u6307\u5b9a\u5b57\u7b26\u4e32\u8fde\u63a5\u5230\u6b64\u5b57\u7b26\u4e32\u7684\u672b\u5c3e\u3002<\/li>\n
                  • \u793a\u4f8b\uff1aString newStr = s.concat(" World"); \/\/ newStr is "Hello World"<\/code><\/li>\n<\/ul>\n<\/li>\n
                  • \n

                    replace(char oldChar, char newChar)<\/strong><\/p>\n

                      \n
                    • \u8fd4\u56de\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\uff0c\u5b83\u662f\u901a\u8fc7\u7528 newChar \u66ff\u6362\u6b64\u5b57\u7b26\u4e32\u4e2d\u51fa\u73b0\u7684\u6240\u6709 oldChar \u5f97\u5230\u7684\u3002<\/li>\n
                    • \u793a\u4f8b\uff1aString replacedStr = s.replace('l', 'p'); \/\/ replacedStr is "Heppo"<\/code><\/li>\n<\/ul>\n<\/li>\n
                    • \n

                      toLowerCase()<\/strong> \u548c toUpperCase()<\/strong><\/p>\n

                        \n
                      • \u5206\u522b\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u6240\u6709\u5b57\u7b26\u8f6c\u6362\u4e3a\u5c0f\u5199\u6216\u5927\u5199\u3002<\/li>\n
                      • \u793a\u4f8b\uff1aString lower = s.toLowerCase(); \/\/ lower is "hello"<\/code><\/li>\n<\/ul>\n<\/li>\n
                      • \n

                        equals(Object anotherObject)<\/strong><\/p>\n

                          \n
                        • \u6bd4\u8f83\u6b64\u5b57\u7b26\u4e32\u4e0e\u6307\u5b9a\u5bf9\u8c61\u662f\u5426\u76f8\u7b49\u3002<\/li>\n
                        • \u793a\u4f8b\uff1aboolean isEqual = s.equals("Hello"); \/\/ isEqual is true<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                          StringBuilder \u5e38\u7528\u65b9\u6cd5<\/h3>\n
                            \n
                          1. \n

                            append(...)<\/strong><\/p>\n

                              \n
                            • \u5c06\u6307\u5b9a\u7684\u6570\u636e\u6dfb\u52a0\u5230\u6b64\u5e8f\u5217\u7684\u672b\u5c3e\u3002<\/li>\n
                            • \u793a\u4f8b\uff1aStringBuilder sb = new StringBuilder("Hello"); sb.append(" World"); \/\/ sb is "Hello World"<\/code><\/li>\n<\/ul>\n<\/li>\n
                            • \n

                              insert(int offset, ...)<\/strong><\/p>\n

                                \n
                              • \u5c06\u6570\u636e\u63d2\u5165\u6b64\u5e8f\u5217\u4e2d\u7684\u6307\u5b9a\u4f4d\u7f6e\u3002<\/li>\n
                              • \u793a\u4f8b\uff1asb.insert(5, " Java"); \/\/ sb is "Hello Java World"<\/code><\/li>\n<\/ul>\n<\/li>\n
                              • \n

                                delete(int start, int end)<\/strong><\/p>\n

                                  \n
                                • \u79fb\u9664\u6b64\u5e8f\u5217\u7684\u5b50\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u3002<\/li>\n
                                • \u793a\u4f8b\uff1asb.delete(5, 10); \/\/ sb is "Hello World"<\/code><\/li>\n<\/ul>\n<\/li>\n
                                • \n

                                  reverse()<\/strong><\/p>\n

                                    \n
                                  • \u5c06\u6b64\u5b57\u7b26\u5e8f\u5217\u7528\u5176\u53cd\u8f6c\u5f62\u5f0f\u53d6\u4ee3\u3002<\/li>\n
                                  • \u793a\u4f8b\uff1asb.reverse(); \/\/ sb is "dlroW olleH"<\/code><\/li>\n<\/ul>\n<\/li>\n
                                  • \n

                                    toString()<\/strong><\/p>\n

                                      \n
                                    • \u8fd4\u56de\u6b64\u5e8f\u5217\u4e2d\u6570\u636e\u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u3002<\/li>\n
                                    • \u793a\u4f8b\uff1aString str = sb.toString(); \/\/ str is "dlroW olleH"<\/code><\/li>\n<\/ul>\n<\/li>\n
                                    • \n

                                      length()<\/strong> \u548c charAt(int index)<\/strong><\/p>\n

                                        \n
                                      • \u8fd9\u4e9b\u65b9\u6cd5\u4e0e String<\/code> \u7c7b\u4e2d\u7684\u65b9\u6cd5\u76f8\u4f3c\uff0c\u7528\u4e8e\u83b7\u53d6\u957f\u5ea6\u548c\u7279\u5b9a\u4f4d\u7f6e\u7684\u5b57\u7b26\u3002<\/li>\n
                                      • \u793a\u4f8b\uff1aint length = sb.length(); \/\/ \u83b7\u53d6 StringBuilder \u7684\u957f\u5ea6<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                                        String<\/code> \u7c7b\u7684\u65b9\u6cd5\u591a\u7528\u4e8e\u4e0d\u53ef\u53d8\u5b57\u7b26\u4e32\u7684\u8bfb\u53d6\u548c\u57fa\u672c\u64cd\u4f5c\uff0c\u800c StringBuilder<\/code> \u7c7b\u7684\u65b9\u6cd5\u5219\u9002\u7528\u4e8e\u66f4\u590d\u6742\u7684\u5b57\u7b26\u4e32\u6784\u5efa\u548c\u4fee\u6539\u64cd\u4f5c\u3002\u7531\u4e8e StringBuilder<\/code> \u662f\u53ef\u53d8\u7684\uff0c\u5b83\u5141\u8bb8\u5728\u4e0d\u751f\u6210\u65b0\u5b57\u7b26\u4e32\u7684\u60c5\u51b5\u4e0b\u4fee\u6539\u5b57\u7b26\u4e32\u5185\u5bb9\uff0c\u8fd9\u5728\u5904\u7406\u5927\u91cf\u5b57\u7b26\u4e32\u64cd\u4f5c\u65f6\u7279\u522b\u6709\u6548\u3002<\/p>\n

                                        StringBuffer<\/code> \u7684\u65b9\u6cd5\u4e0e StringBuilder<\/code> \u7684\u65b9\u6cd5\u975e\u5e38\u76f8\u4f3c\u3002\u4e8b\u5b9e\u4e0a\uff0c\u4e24\u8005\u5171\u4eab\u51e0\u4e4e\u76f8\u540c\u7684 API\uff0c\u7528\u4e8e\u8fdb\u884c\u5b57\u7b26\u4e32\u7684\u6dfb\u52a0\u3001\u63d2\u5165\u3001\u5220\u9664\u548c\u4fee\u6539\u7b49\u64cd\u4f5c\u3002\u4e3b\u8981\u533a\u522b\u5728\u4e8e StringBuffer<\/code> \u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u56e0\u4e3a\u5b83\u7684\u5927\u90e8\u5206\u65b9\u6cd5\u90fd\u662f\u540c\u6b65\u7684\uff0c\u800c StringBuilder<\/code> \u5219\u6ca1\u6709\u8fd9\u79cd\u7ebf\u7a0b\u5b89\u5168\u4fdd\u8bc1\u4f46\u6267\u884c\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n

                                        String \u4e0e StringBuilder \u4e4b\u95f4\u7684\u76f8\u4e92\u8f6c\u6362<\/h3>\n
                                          \n
                                        1. \n

                                          \u4ece String \u8f6c\u6362\u4e3a StringBuilder<\/strong><\/p>\n

                                            \n
                                          • \u4f60\u53ef\u4ee5\u4f7f\u7528 StringBuilder<\/code> \u7684\u6784\u9020\u51fd\u6570\u5c06 String<\/code> \u8f6c\u6362\u4e3a StringBuilder<\/code>\u3002<\/li>\n
                                          • \u793a\u4f8b\uff1a\n
                                            String str = \"Hello\";\nStringBuilder sb = new StringBuilder(str);\n\/\/ \u73b0\u5728\u53ef\u4ee5\u5bf9 sb \u8fdb\u884c\u4fee\u6539\u64cd\u4f5c<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n
                                          • \n
                                            \u4ece StringBuilder \u8f6c\u6362\u4e3a String<\/strong><\/p>\n
                                              \n
                                            • \u4f7f\u7528 StringBuilder<\/code> \u7684 toString()<\/code> \u65b9\u6cd5\u53ef\u4ee5\u5c06 StringBuilder<\/code> \u5bf9\u8c61\u8f6c\u6362\u56de String<\/code>\u3002<\/li>\n
                                            • \u793a\u4f8b\uff1a\n
                                              StringBuilder sb = new StringBuilder(\"Hello\");\nString str = sb.toString();\n\/\/ str \u73b0\u5728\u662f\u4e00\u4e2a String \u5bf9\u8c61\uff0c\u503c\u4e3a \"Hello\"<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
                                              \u8fd9\u79cd\u8f6c\u6362\u4f7f\u5f97\u5728\u9700\u8981\u53ef\u53d8\u6027\u65f6\u53ef\u4ee5\u4f7f\u7528 StringBuilder<\/code> \u8fdb\u884c\u9ad8\u6548\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\uff0c\u800c\u5728\u9700\u8981\u4e0d\u53ef\u53d8\u5b57\u7b26\u4e32\u6216\u8fdb\u884c\u5b57\u7b26\u4e32\u64cd\u4f5c\u7ed3\u675f\u540e\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06\u7ed3\u679c\u8f6c\u6362\u56de String<\/code>\u3002\u8fd9\u6837\u7684\u8bbe\u8ba1\u63d0\u4f9b\u4e86\u7075\u6d3b\u6027\u548c\u6548\u7387\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u9700\u8981\u591a\u6b21\u4fee\u6539\u7684\u5b57\u7b26\u4e32\u65f6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                                              \u603b\u7ed3Java\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\u548c\u65b9\u6cd5 Java\u4e2d\u7684String\u3001StringBuilder\u548cStringBuffer\u662f\u5904\u7406\u5b57\u7b26\u4e32\u7684\u4e09\u79cd\u4e3b …<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[5,9],"class_list":["post-200","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java","tag-leetcode"],"_links":{"self":[{"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/posts\/200","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/comments?post=200"}],"version-history":[{"count":3,"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/posts\/200\/revisions"}],"predecessor-version":[{"id":203,"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/posts\/200\/revisions\/203"}],"wp:attachment":[{"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/media?parent=200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/categories?post=200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wangqianming.top\/index.php\/wp-json\/wp\/v2\/tags?post=200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}