{"id":31234,"date":"2023-02-26T00:28:35","date_gmt":"2024-01-28T14:37:35","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2-2\/"},"modified":"2025-08-12T22:59:18","modified_gmt":"2025-08-12T14:59:18","slug":"%e5%85%b3%e4%ba%8ejava%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2-2\/","title":{"rendered":"\u5173\u4e8eJava\u7684\u5b57\u7b26\u4e32"},"content":{"rendered":"

\u6211\u5c06\u603b\u7ed3\u4e00\u4e0bJava\u4e2d\u7684String\u3002<\/p>\n

String\u7684\u610f\u601d\u662f\u8fd9\u662f\u4e00\u4e2a\u5904\u7406\u5b57\u7b26\u4e32\u7684\u7c7b\u3002\u5b83\u53ef\u4ee5\u50cf\u52a0\u6cd5\u4e00\u6837\u8fdb\u884c\u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u64cd\u4f5c\uff0c\u53ef\u80fd\u4f1a\u8ba9C\u8bed\u8a00\u8f6c\u6218\u800c\u6765\u7684\u4eba\u611f\u5230\u60ca\u559c\u3002<\/p>\n
public<\/span> class<\/span> Test<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        String<\/span> a<\/span> =<\/span> \"aaa\"<\/span>;<\/span>\r\n        a<\/span> +=<\/span> \"bbb\"<\/span>;<\/span>\r\n        a<\/span> +=<\/span> \"ccc\"<\/span>;<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>a<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
String\u662f\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5bf9\u8c61\u3002\u8868\u9762\u4e0a\u770b\uff0c\u5b83\u770b\u8d77\u6765\u50cf\u662f\u53ef\u4ee5\u50cf\u52a0\u6cd5\u4e00\u6837\u8fde\u63a5\u7684String\uff0c\u4f46\u5b9e\u9645\u4e0a\u5b83\u5728\u5185\u90e8\u8fdb\u884c\u4e86\u91cd\u65b0\u521b\u5efa\u5bf9\u8c61\u7684\u5904\u7406\u3002\u8fd9\u662f\u56e0\u4e3aString\u662f\u4e00\u79cd\u4e0d\u53ef\u4fee\u6539\u7684\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff08Immutable Object\uff09\u3002\u4ee5\u524d\u7684\u4f8b\u5b50\u4e2d\uff0c\u5b83\u5b9e\u9645\u4e0a\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c\u3002<\/p>\n
public<\/span> class<\/span> Test<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        String<\/span> a<\/span> =<\/span> \"aaa\"<\/span>;<\/span>\r\n        a<\/span> +=<\/span> \"bbb\"<\/span>;<\/span> \/\/ \u300eaaa\u300f\u3068\u300ebbb\u300f\u3092\u7d50\u5408\u3055\u305b\u305f\u6587\u5b57\u5217\u300eaaabbb\u300f\u3092\u683c\u7d0d\u3057\u305fString\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u53c2\u7167\u3092a\u306b\u4ee3\u5165<\/span>\r\n        a<\/span> +=<\/span> \"ccc\"<\/span>;<\/span> \/\/ \u300eaaabbb\u300f\u3068\u300eccc\u300f\u3092\u7d50\u5408\u3055\u305b\u305f\u6587\u5b57\u5217\u300eaaabbbccc\u300f\u3092\u683c\u7d0d\u3057\u305fString\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u53c2\u7167\u3092a\u306b\u4ee3\u5165<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>a<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5b57\u7b26\u4e32\u7684\u590d\u5236\u5728Java\u4e2d\u6709\u6d45\u62f7\u8d1d\u548c\u6df1\u62f7\u8d1d\u7684\u6982\u5ff5\uff08\u8be6\u7ec6\u4fe1\u606f\u8bf7\u53c2\u8003Java\u7684clone\u65b9\u6cd5\u6b63\u786e\u7684\u5b9e\u73b0\u65b9\u6cd5-Qiita\uff09\uff0c\u4f46\u662f\u5bf9\u4e8eString\u6765\u8bf4\uff0c\u6d45\u62f7\u8d1d\u5c31\u8db3\u591f\u4e86\u3002\u8fd9\u662f\u56e0\u4e3aString\u662f\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff0c\u5373\u4f7f\u5f15\u7528\u4e86\u76f8\u540c\u7684\u5bf9\u8c61\uff0c\u4e5f\u4e0d\u5fc5\u62c5\u5fc3\u6539\u53d8\u5176\u5185\u5bb9\u3002<\/p>\n
\u5b57\u7b26\u4e32\u7684\u8fde\u63a5 (String concatenation)<\/p>\n
\u5b57\u7b26\u4e32\u6784\u5efa\u5668<\/p>\n
\u5b57\u7b26\u4e32\u751f\u6210\u5668
\nStringBuilder\u662f\u4e00\u79cd\u7528\u4e8e\u8fde\u63a5\u5b57\u7b26\u4e32\u7684\u5bf9\u8c61\uff0c\u5b83\u901a\u8fc7append\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u5b58\u50a8\u5728\u5185\u90e8\u7684char\u6570\u7ec4\u4e2d\uff0c\u5e76\u901a\u8fc7toString\u65b9\u6cd5\u5c06\u5b83\u4eec\u5408\u5e76\u6210\u4e00\u4e2aString\u3002\u6211\u4e4b\u524d\u5199\u7684\u662f\u5728\u8fde\u63a5\u5b57\u7b26\u4e32\u65f6\u4f1a\u91cd\u65b0\u521b\u5efaString\uff0c\u4f46\u5b9e\u9645\u4e0a\u662f\u4f7f\u7528\u4e86\u8fd9\u4e2aStringBuilder\u3002\u4f8b\u5982\uff0c\u4e0a\u8ff0\u4ee3\u7801\u5b9e\u9645\u4e0a\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c\u3002<\/p>\n
public<\/span> class<\/span> Test<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        String<\/span> a<\/span> =<\/span> \"aaa\"<\/span>;<\/span>\r\n        a<\/span> =<\/span> (<\/span>new<\/span> StringBuilder<\/span>(<\/span>String<\/span>.<\/span>valueOf<\/span>(<\/span>a<\/span>))).<\/span>append<\/span>(<\/span>\"bbb\"<\/span>).<\/span>toString<\/span>();<\/span> \/\/ \u300eaaa\u300f\u3068\u300ebbb\u300f\u3092\u7d50\u5408\u3055\u305b\u305f\u6587\u5b57\u5217\u300eaaabbb\u300f\u3092\u683c\u7d0d\u3057\u305fString\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u53c2\u7167\u3092a\u306b\u4ee3\u5165<\/span>\r\n        a<\/span> =<\/span> (<\/span>new<\/span> StringBuilder<\/span>(<\/span>String<\/span>.<\/span>valueOf<\/span>(<\/span>a<\/span>))).<\/span>append<\/span>(<\/span>\"ccc\"<\/span>).<\/span>toString<\/span>();<\/span> \/\/ \u300eaaabbb\u300f\u3068\u300eccc\u300f\u3092\u7d50\u5408\u3055\u305b\u305f\u6587\u5b57\u5217\u300eaaabbbccc\u300f\u3092\u683c\u7d0d\u3057\u305fString\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u53c2\u7167\u3092a\u306b\u4ee3\u5165<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>a<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6839\u636e\u67e5\u770b\u6b64\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u6bcf\u6b21\u8fde\u63a5\u90fd\u4f1a\u751f\u6210\u4e00\u4e2aStringBuilder\u3002\u7136\u800c\uff0c\u8003\u8651\u5230\u7d2f\u79ef\u540e\u518d\u8fde\u63a5\u7684\u7528\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u4ee5\u4e0b\u5f62\u5f0f\u66f4\u52a0\u6709\u6548\u3002<\/p>\n
public<\/span> class<\/span> Test<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        StringBuilder<\/span> sb<\/span> =<\/span> new<\/span> StringBuilder<\/span>();<\/span>\r\n        sb<\/span>.<\/span>append<\/span>(<\/span>\"aaa\"<\/span>);<\/span>\r\n        sb<\/span>.<\/span>append<\/span>(<\/span>\"bbb\"<\/span>);<\/span>\r\n        sb<\/span>.<\/span>append<\/span>(<\/span>\"ccc\"<\/span>);<\/span>\r\n        String<\/span> a<\/span> =<\/span> sb<\/span>.<\/span>toString<\/span>();<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>a<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5b57\u7b26\u4e32\u7f13\u51b2\u5668
\nStringBuilder\u7684\u7ebf\u7a0b\u5b89\u5168\u7248\u672c\u662fStringBuffer\u3002\u7528\u6cd5\u4e0eStringBuilder\u76f8\u540c\u3002<\/p>\n
public<\/span> class<\/span> Test<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        StringBuffer<\/span> sb<\/span> =<\/span> new<\/span> StringBuffer<\/span>();<\/span>\r\n        sb<\/span>.<\/span>append<\/span>(<\/span>\"aaa\"<\/span>);<\/span>\r\n        sb<\/span>.<\/span>append<\/span>(<\/span>\"bbb\"<\/span>);<\/span>\r\n        sb<\/span>.<\/span>append<\/span>(<\/span>\"ccc\"<\/span>);<\/span>\r\n        String<\/span> a<\/span> =<\/span> sb<\/span>.<\/span>toString<\/span>();<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>a<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
concat \u65b9\u6cd5String\u4e2d\u6709\u4e00\u4e2a\u540d\u4e3aconcat\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c062\u4e2aString\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u7528\u6cd5\u5982\u4e0b\u3002<\/p>\n
public<\/span> class<\/span> Test<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        String<\/span> a<\/span> =<\/span> \"aaa\"<\/span>;<\/span>\r\n        a<\/span> =<\/span> a<\/span>.<\/span>concat<\/span>(<\/span>\"bbb\"<\/span>);<\/span> \/\/ \u300eaaa\u300f\u3068\u300ebbb\u300f\u3092\u7d50\u5408\u3055\u305b\u305f\u6587\u5b57\u5217\u300eaaabbb\u300f\u3092\u683c\u7d0d\u3057\u305fString\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u53c2\u7167\u3092a\u306b\u4ee3\u5165<\/span>\r\n        a<\/span> =<\/span> a<\/span>.<\/span>concat<\/span>(<\/span>\"ccc\"<\/span>);<\/span> \/\/ \u300eaaabbb\u300f\u3068\u300eccc\u300f\u3092\u7d50\u5408\u3055\u305b\u305f\u6587\u5b57\u5217\u300eaaabbbccc\u300f\u3092\u683c\u7d0d\u3057\u305fString\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u53c2\u7167\u3092a\u306b\u4ee3\u5165<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>a<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728\u5185\u90e8\uff0c\u6267\u884c\u4e86\u5c06\u4e24\u4e2a\u5b57\u7b26\u4e32\u8fde\u63a5\u6210\u4e00\u4e2aString\u7684\u64cd\u4f5c\u3002<\/p>\n
\u7075\u6d3b\u8fd0\u7528\u5982\u679c\u9700\u8981\u5408\u5e76\u591a\u4e2a\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528StringBuilder\uff08\u6216StringBuffer\uff09\u662f\u66f4\u597d\u7684\u9009\u62e9\uff1b\u5982\u679c\u53ea\u9700\u8981\u5408\u5e76\u4e00\u6b21\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528concat\u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n
\u6587\u732e\u5f15\u7528<\/p>\n
    \n
  • \n
      \u30b9\u30c3\u30ad\u30ea\u308f\u304b\u308bJava\u5165\u9580 \u5b9f\u8df5\u7de8 \u7b2c2\u7248(\u4e2d\u5c71 \u6e05\u55ac\u30fb\u8457)<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          Java\u306b\u304a\u3051\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8907\u88fd(clone) – \u6d45\u3044\u30b3\u30d4\u30fc\u3068\u6df1\u3044\u30b3\u30d4\u30fc<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \n
          • \n
              \u53c2\u7167\u306b\u3064\u3044\u3066\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f ~Python\u3068Java\u3092\u4f8b\u306b~ – Qiita<\/ul>\n<\/li>\n<\/ul>\n
               <\/p>\n
                String\u306e\u9023\u7d50\u306f\u305d\u3046\u7c21\u5358\u306a\u3082\u306e\u3067\u306f\u306a\u3044 – \u3058\u3085\u3093\u3044\u3061\u2606\u304b\u3068\u3046\u306e\u6280\u8853\u65e5\u8a8c<\/ul>\n","protected":false},"excerpt":{"rendered":"
                \u6211\u5c06\u603b\u7ed3\u4e00\u4e0bJava\u4e2d\u7684String\u3002 String\u7684\u610f\u601d\u662f\u8fd9\u662f\u4e00\u4e2a\u5904\u7406\u5b57\u7b26\u4e32\u7684\u7c7b\u3002\u5b83\u53ef\u4ee5\u50cf\u52a0\u6cd5\u4e00\u6837\u8fdb\u884c\u5b57\u7b26\u4e32 […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31234","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\n\u5173\u4e8eJava\u7684\u5b57\u7b26\u4e32 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5173\u4e8eJava\u7684\u5b57\u7b26\u4e32\u7684\u6280\u672f\u6587\u7ae0\" \/>\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\/\u5173\u4e8ejava\u7684\u5b57\u7b26\u4e32-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5173\u4e8eJava\u7684\u5b57\u7b26\u4e32\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u5173\u4e8eJava\u7684\u5b57\u7b26\u4e32\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5173\u4e8ejava\u7684\u5b57\u7b26\u4e32-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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