{"id":497,"date":"2023-10-19T07:48:13","date_gmt":"2023-06-19T13:05:48","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-%e7%a9%ba%e6%8c%87%e9%92%88%e5%bc%82%e5%b8%b8-%e6%a3%80%e6%b5%8b%e3%80%81%e4%bf%ae%e5%a4%8d%e5%92%8c%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5\/"},"modified":"2025-08-02T14:17:23","modified_gmt":"2025-08-02T06:17:23","slug":"java-%e7%a9%ba%e6%8c%87%e9%92%88%e5%bc%82%e5%b8%b8-%e6%a3%80%e6%b5%8b%e3%80%81%e4%bf%ae%e5%a4%8d%e5%92%8c%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e7%a9%ba%e6%8c%87%e9%92%88%e5%bc%82%e5%b8%b8-%e6%a3%80%e6%b5%8b%e3%80%81%e4%bf%ae%e5%a4%8d%e5%92%8c%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5\/","title":{"rendered":"Java\u7a7a\u6307\u9488\u5f02\u5e38\u5b8c\u5168\u89e3\u51b3\u6307\u5357\uff1a\u68c0\u6d4b\u3001\u4fee\u590d\u4e0e\u6700\u4f73\u5b9e\u8df5\u8be6\u89e3"},"content":{"rendered":"

\u8fd9\u662f\u6587\u7ae0\u300aJava \u7a7a\u6307\u9488\u5f02\u5e38 – \u68c0\u6d4b\u3001\u4fee\u590d\u548c\u6700\u4f73\u5b9e\u8df5\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51718\u90e8\u5206\uff09\u3002<\/p>\n

java.lang.NullPointerException\u662fJava\u7f16\u7a0b\u4e2d\u6700\u5e38\u89c1\u7684\u5f02\u5e38\u4e4b\u4e00\u3002\u5728Java\u7684\u72ec\u7acb\u7a0b\u5e8f\u548cWeb\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u4efb\u4f55\u4f7f\u7528Java\u7684\u4eba\u90fd\u53ef\u80fd\u7a81\u7136\u906d\u9047\u5230\u8fd9\u4e2a\u5f02\u5e38\u3002<\/p>\n

java.lang.NullPointerException \u6982\u8ff0<\/h2>\n
\"java<\/div>\n

\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerException\uff09\u662f\u4e00\u79cd\u8fd0\u884c\u65f6\u5f02\u5e38\uff0c\u56e0\u6b64\u6211\u4eec\u5728\u7a0b\u5e8f\u4e2d\u4e0d\u9700\u8981\u6355\u83b7\u5b83\u3002\u5f53\u5e94\u7528\u7a0b\u5e8f\u8bd5\u56fe\u5bf9null\u503c\u6267\u884c\u67d0\u4e9b\u9700\u8981\u5bf9\u8c61\u7684\u64cd\u4f5c\u65f6\uff0c\u5c31\u4f1a\u5f15\u53d1\u7a7a\u6307\u9488\u5f02\u5e38\u3002Java\u7a0b\u5e8f\u4e2d\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u4e00\u4e9b\u5e38\u89c1\u539f\u56e0\u662f\uff1a<\/p>\n

    \n
  1. \u5728\u8fd0\u884c\u65f6\u8c03\u7528\u5bf9\u8c61\u5b9e\u4f8b\u7684\u65b9\u6cd5\uff0c\u4f46\u5bf9\u8c61\u4e3anull\u3002<\/li>\n
  2. \u5728\u8fd0\u884c\u65f6\u8bbf\u95eenull\u5bf9\u8c61\u5b9e\u4f8b\u7684\u53d8\u91cf\u3002<\/li>\n
  3. \u5728\u7a0b\u5e8f\u4e2d\u629b\u51fanull\u503c\u3002<\/li>\n
  4. \u8bbf\u95ee\u6216\u4fee\u6539null\u6570\u7ec4\u7684\u7d22\u5f15\u503c\u3002<\/li>\n
  5. \u5728\u8fd0\u884c\u65f6\u68c0\u67e5null\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/li>\n<\/ol>\n

    Java \u7a7a\u6307\u9488\u5f02\u5e38\u793a\u4f8b<\/h2>\n

    \u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e9b\u5728Java\u7a0b\u5e8f\u4e2d\u51fa\u73b0\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u4f8b\u5b50\u3002<\/p>\n

    1. \u8c03\u7528\u5b9e\u4f8b\u65b9\u6cd5\u65f6\u53d1\u751f\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    public<\/span> class<\/span> Temp<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\r\n        Temp<\/span> t =<\/span> initT<\/span>(<\/span>)<\/span>;<\/span>\r\n        \r\n        t.<\/span>foo<\/span>(<\/span>\"Hi\"<\/span>)<\/span>;<\/span>\r\n        \r\n    }<\/span>\r\n\r\n    private<\/span> static<\/span> Temp<\/span> initT<\/span>(<\/span>)<\/span> {<\/span>\r\n        return<\/span> null<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> foo<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>s.<\/span>toLowerCase<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\uff0c\u5b83\u629b\u51fa\u4ee5\u4e0b\u7a7a\u6307\u9488\u5f02\u5e38\u9519\u8bef\u6d88\u606f\uff1a<\/p>\n
    Exception<\/span> in thread \"main\"<\/span> java.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n    at Temp<\/span>.<\/span>main<\/span>(<\/span>Temp<\/span>.<\/span>java:<\/span>7<\/span>)<\/span>\r\n<\/code><\/pre>\n
    \u6211\u4eec\u5728”t.foo(“Hi”)”\u8bed\u53e5\u4e2d\u9047\u5230NullPointerException\uff0c\u56e0\u4e3a\u5728\u8fd9\u91cc”t”\u662f\u7a7a\u7684\u3002<\/p>\n
    2. \u5f53\u8bbf\u95ee\/\u4fee\u6539\u7a7a\u5bf9\u8c61\u7684\u5b57\u6bb5\u65f6\u53d1\u751fJava\u7684\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    \u8fd9\u662f\u6587\u7ae0\u300aJava \u7a7a\u6307\u9488\u5f02\u5e38 – \u68c0\u6d4b\u3001\u4fee\u590d\u548c\u6700\u4f73\u5b9e\u8df5\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51718\u90e8\u5206\uff09\u3002<\/h3>\n
    public<\/span> class<\/span> Temp<\/span> {<\/span>\r\n\r\n\tpublic<\/span> int<\/span> x =<\/span> 10<\/span>;<\/span>\r\n\t\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\r\n\t\tTemp<\/span> t =<\/span> initT<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t\r\n\t\tint<\/span> i =<\/span> t.<\/span>x;<\/span>\r\n\t\t\r\n\t}<\/span>\r\n\r\n\tprivate<\/span> static<\/span> Temp<\/span> initT<\/span>(<\/span>)<\/span> {<\/span>\r\n\t\treturn<\/span> null<\/span>;<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u4e0a\u8ff0\u7a0b\u5e8f\u629b\u51fa\u4e86\u4ee5\u4e0b\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u5806\u6808\u8ddf\u8e2a\u3002<\/p>\n
    Exception<\/span> in thread \"main\"<\/span> java.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n\tat Temp<\/span>.<\/span>main<\/span>(<\/span>Temp<\/span>.<\/span>java:<\/span>9<\/span>)<\/span>\r\n<\/code><\/pre>\n
    \u7531\u4e8e\u53d8\u91cf”t”\u4e3a\u7a7a\uff0c\u8bed\u53e5”int i = t.x;”\u629b\u51fa\u4e86\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerException\uff09\u3002<\/p>\n
    \u5f53\u5728\u65b9\u6cd5\u53c2\u6570\u4e2d\u4f20\u9012\u7a7a\u503c\u65f6\uff0cJava\u4f1a\u51fa\u73b0\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    public<\/span> class<\/span> Temp<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\r\n\t\tfoo<\/span>(<\/span>null<\/span>)<\/span>;<\/span>\r\n\r\n\t}<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> foo<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>\r\n\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>s.<\/span>toLowerCase<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u8fd9\u662fjava.lang.NullPointerException\u6700\u5e38\u89c1\u7684\u60c5\u51b5\u4e4b\u4e00\uff0c\u56e0\u4e3a\u662f\u8c03\u7528\u8005\u4f20\u9012\u4e86\u7a7a\u53c2\u6570\u3002<\/p>\n
    \u4ee5\u4e0b\u56fe\u50cf\u663e\u793a\u4e86\u5728Eclipse IDE\u4e2d\u6267\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\u51fa\u73b0\u7684\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n
    \"Exception<\/div>\n
    \u5f53\u629b\u51fa null \u65f6\uff0c\u4f1a\u51fa\u73b0 java.lang.NullPointerException<\/h3>\n
    \u629b\u51fanull\u503c\u5bfc\u81f4\u7684\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    public<\/span> class<\/span> Temp<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\r\n\t\tthrow<\/span> null<\/span>;<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u4ee5\u4e0b\u662f\u4e0a\u8ff0\u7a0b\u5e8f\u7684\u5f02\u5e38\u5806\u6808\u8ddf\u8e2a\uff0c\u663e\u793a\u4e86\u7531\u4e8e\u629b\u51fa”null”\u503c\u800c\u5f15\u53d1\u7684\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerException\uff09\u3002<\/p>\n
    Exception<\/span> in thread \"main\"<\/span> java.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n\tat Temp<\/span>.<\/span>main<\/span>(<\/span>Temp<\/span>.<\/span>java:<\/span>5<\/span>)<\/span>\r\n<\/code><\/pre>\n
    \u83b7\u53d6\u7a7a\u6570\u7ec4\u957f\u5ea6\u65f6\u7684\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    public<\/span> class<\/span> Temp<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\r\n\t\tint<\/span>[<\/span>]<\/span> data =<\/span> null<\/span>;<\/span>\r\n\t\t\r\n\t\tint<\/span> len =<\/span> data.<\/span>length;<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
    Exception<\/span> in thread \"main\"<\/span> java.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n\tat Temp<\/span>.<\/span>main<\/span>(<\/span>Temp<\/span>.<\/span>java:<\/span>7<\/span>)<\/span>\r\n<\/code><\/pre>\n
    \u8bbf\u95ee\u7a7a\u6570\u7ec4\u7d22\u5f15\u503c\u65f6\u7684\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    \u5f53\u5c1d\u8bd5\u8bbf\u95ee\u7a7a\u6570\u7ec4\u7684\u7d22\u5f15\u503c\u65f6\uff0c\u540c\u6837\u4f1a\u53d1\u751f\u7a7a\u6307\u9488\u5f02\u5e38\u3002\u8fd9\u662f\u56e0\u4e3a\u7a7a\u6570\u7ec4\u6ca1\u6709\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u65e0\u6cd5\u8bbf\u95ee\u5176\u4efb\u4f55\u5143\u7d20\u3002<\/p>\n
    \u8bbf\u95ee\u7a7a\u6570\u7ec4\u5143\u7d20\u5bfc\u81f4\u7684\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    public<\/span> class<\/span> Temp<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\r\n\t\tint<\/span>[<\/span>]<\/span> data =<\/span> null<\/span>;<\/span>\r\n\t\t\r\n\t\tint<\/span> len =<\/span> data[<\/span>2<\/span>]<\/span>;<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u5f02\u5e38<\/span> \u5728\u7ebf\u7a0b \"main\"<\/span> java.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n\t\u5728 Temp<\/span>.<\/span>main<\/span>(<\/span>Temp<\/span>.<\/span>java:<\/span>7<\/span>)<\/span>\r\n<\/code><\/pre>\n
    \u5728\u7a7a\u5bf9\u8c61\u4e0a\u8fdb\u884c\u540c\u6b65\u5bfc\u81f4\u7684\u7a7a\u6307\u9488\u5f02\u5e38<\/h3>\n
    public<\/span> class<\/span> Temp<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> String<\/span> mutex =<\/span> null<\/span>;<\/span>\r\n\t\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\r\n\t\tsynchronized<\/span>(<\/span>mutex)<\/span> {<\/span>\r\n\t\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\u540c\u6b65\u4ee3\u7801\u5757\"<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span>\t\t\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u7531\u4e8emutex<\/span>\u5bf9\u8c61\u4e3a\u7a7a\uff0c\u540c\u6b65\u64cd\u4f5csynchronized(mutex)<\/span>\u5c06\u5f15\u53d1\u7a7a\u6307\u9488\u5f02\u5e38\uff08NullPointerException\uff09\u3002<\/p>\n
    HTTP\u72b6\u6001500\u4e0e\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u5173\u7cfb<\/h3>\n
    HTTP\u72b6\u6001\u7801\u4e3a500\uff0c\u8868\u793a\u670d\u52a1\u5668\u5185\u90e8\u51fa\u73b0\u4e86\u7a7a\u6307\u9488\u5f02\u5e38\u3002\u5f53Java Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\u53d1\u751f\u672a\u6355\u83b7\u7684\u7a7a\u6307\u9488\u5f02\u5e38\u65f6\uff0c\u670d\u52a1\u5668\u901a\u5e38\u4f1a\u8fd4\u56deHTTP 500\u9519\u8bef\uff0c\u8868\u660e\u8fd9\u662f\u4e00\u4e2a\u670d\u52a1\u5668\u5185\u90e8\u9519\u8bef\u3002<\/p>\n
    \u6709\u65f6\u5019\u6211\u4eec\u4eceJava\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u5f97\u5230\u4e00\u4e2a\u9519\u8bef\u9875\u9762\u54cd\u5e94\uff0c\u9519\u8bef\u4fe1\u606f\u663e\u793a\u4e3a”HTTP\u72b6\u6001500 – \u670d\u52a1\u5668\u5185\u90e8\u9519\u8bef”\uff0c\u6839\u672c\u539f\u56e0\u662fjava.lang.NullPointerException\u3002<\/p>\n
    \u4e3a\u6b64\uff0c\u6211\u7f16\u8f91\u4e86Spring MVC\u793a\u4f8b\u9879\u76ee\uff0c\u5e76\u5c06HomeController\u65b9\u6cd5\u4fee\u6539\u5982\u4e0b\u3002<\/p>\n
    @RequestMapping<\/span>(<\/span>value =<\/span> \"\/user\"<\/span>,<\/span> method =<\/span> RequestMethod<\/span>.<\/span>POST<\/span>)<\/span>\r\n\tpublic<\/span> String<\/span> user<\/span>(<\/span>@Validated<\/span> User<\/span> user,<\/span> Model<\/span> model)<\/span> {<\/span>\r\n\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\u7528\u6237\u9875\u9762\u8bf7\u6c42\"<\/span>)<\/span>;<\/span>\r\n\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\u7528\u6237\u540d: \"<\/span>+<\/span>user.<\/span>getUserName<\/span>(<\/span>)<\/span>.<\/span>toLowerCase<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\u7528\u6237ID: \"<\/span>+<\/span>user.<\/span>getUserId<\/span>(<\/span>)<\/span>.<\/span>toLowerCase<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n\t\tmodel.<\/span>addAttribute<\/span>(<\/span>\"userName\"<\/span>,<\/span> user.<\/span>getUserName<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n\t\treturn<\/span> \"user\"<\/span>;<\/span>\r\n\t}<\/span>\r\n<\/code><\/pre>\n
    \u4e0b\u9762\u7684\u56fe\u7247\u663e\u793a\u4e86\u7f51\u9875\u5e94\u7528\u7a0b\u5e8f\u54cd\u5e94\u65f6\u6240\u629b\u51fa\u7684\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n
    \"HTTP<\/div>\n
    \u8fd9\u662f\u5f02\u5e38\u7684\u5806\u6808\u8ddf\u8e2a\uff1a<\/p>\n
    HTTP<\/span> Status<\/span> 500<\/span> \u2013 Internal<\/span> Server<\/span> Error<\/span>\r\n\r\nType<\/span> Exception<\/span> Report<\/span>\r\n\r\nMessage<\/span> Request<\/span> processing failed;<\/span> nested exception is java.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n\r\nDescription<\/span> The<\/span> server encountered an unexpected condition that prevented it from fulfilling the request.<\/span><\/span>\r\n\r\nException<\/span>\r\n\r\norg.<\/span>springframework.<\/span>web.<\/span>util.<\/span><\/span>NestedServletException<\/span>:<\/span> Request<\/span> processing failed;<\/span> nested exception is java.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n\torg.<\/span>springframework.<\/span>web.<\/span>servlet.<\/span><\/span>FrameworkServlet<\/span>.<\/span>processRequest<\/span>(<\/span>FrameworkServlet<\/span>.<\/span>java:<\/span>982<\/span>)<\/span>\r\n\torg.<\/span>springframework.<\/span>web.<\/span>servlet.<\/span><\/span>FrameworkServlet<\/span>.<\/span>doPost<\/span>(<\/span>FrameworkServlet<\/span>.<\/span>java:<\/span>872<\/span>)<\/span>\r\n\tjavax.<\/span>servlet.<\/span>http.<\/span><\/span>HttpServlet<\/span>.<\/span>service<\/span>(<\/span>HttpServlet<\/span>.<\/span>java:<\/span>661<\/span>)<\/span>\r\n\torg.<\/span>springframework.<\/span>web.<\/span>servlet.<\/span><\/span>FrameworkServlet<\/span>.<\/span>service<\/span>(<\/span>FrameworkServlet<\/span>.<\/span>java:<\/span>846<\/span>)<\/span>\r\n\tjavax.<\/span>servlet.<\/span>http.<\/span><\/span>HttpServlet<\/span>.<\/span>service<\/span>(<\/span>HttpServlet<\/span>.<\/span>java:<\/span>742<\/span>)<\/span>\r\n\torg.<\/span>apache.<\/span>tomcat.<\/span>websocket.<\/span>server.<\/span><\/span>WsFilter<\/span>.<\/span>doFilter<\/span>(<\/span>WsFilter<\/span>.<\/span>java:<\/span>52<\/span>)<\/span>\r\nRoot<\/span> Cause<\/span>\r\n\r\njava.<\/span>lang.<\/span><\/span>NullPointerException<\/span>\r\n\tcom.<\/span>scdev.<\/span>spring.<\/span>controller.<\/span><\/span>HomeController<\/span>.<\/span>user<\/span>(<\/span>HomeController<\/span>.<\/span>java:<\/span>38<\/span>)<\/span>\r\n\tsun.<\/span>reflect.<\/span><\/span>NativeMethodAccessorImpl<\/span>.<\/span>invoke0<\/span>(<\/span>Native<\/span> Method<\/span>)<\/span>\r\n\tsun.<\/span>reflect.<\/span><\/span>NativeMethodAccessorImpl<\/span>.<\/span>invoke<\/span>(<\/span>NativeMethodAccessorImpl<\/span>.<\/span>java:<\/span>62<\/span>)<\/span>\r\n\tsun.<\/span>reflect.<\/span><\/span>DelegatingMethodAccessorImpl<\/span>.<\/span>invoke<\/span>(<\/span>DelegatingMethodAccessorImpl<\/span>.<\/span>java:<\/span>43<\/span>)<\/span>\r\n\tjava.<\/span>lang.<\/span>reflect.<\/span><\/span>Method<\/span>.<\/span>invoke<\/span>(<\/span>Method<\/span>.<\/span>java:<\/span>498<\/span>)<\/span>\r\n<\/code><\/pre>\n
    \u6839\u672c\u539f\u56e0\u662f\u5728 user.getUserId().toLowerCase() \u8fd9\u4e2a\u8bed\u53e5\u4e2d\u51fa\u73b0\u4e86 NullPointerException\uff0c\u56e0\u4e3a user.getUserId() \u8fd4\u56de\u4e86 null.<\/p>\n
    \u5982\u4f55\u68c0\u6d4bJava\u4e2d\u7684NullPointerException<\/p>\n
    \u68c0\u6d4b\u5230\u7a7a\u6307\u9488\u5f02\u5e38\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u67e5\u770b\u5f02\u5e38\u8ddf\u8e2a\uff0c\u5b83\u4f1a\u663e\u793a\u51fa\u5f02\u5e38\u7684\u7c7b\u540d\u548c\u884c\u53f7\u3002\u7136\u540e\u67e5\u770b\u4ee3\u7801\uff0c\u770b\u770b\u53ef\u80fd\u662f\u4ec0\u4e48\u9020\u6210\u4e86\u7a7a\u6307\u9488\u5f02\u5e38\u3002\u53ea\u9700\u67e5\u770b\u4ee5\u4e0a\u6240\u6709\u793a\u4f8b\uff0c\u4ece\u5806\u6808\u8ddf\u8e2a\u4e2d\u5c31\u5f88\u6e05\u695a\u662f\u4ec0\u4e48\u5f15\u8d77\u4e86\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n
    \u5982\u4f55\u4fee\u590d\u7a7a\u6307\u9488\u5f02\u5e38<\/h2>\n
    java.lang.NullPointerException\u662f\u4e00\u4e2a\u672a\u7ecf\u68c0\u67e5\u7684\u5f02\u5e38\uff0c\u6240\u4ee5\u6211\u4eec\u4e0d\u9700\u8981\u6355\u83b7\u5b83\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u7a7a\u68c0\u67e5\u548c\u9884\u9632\u6027\u7f16\u7801\u6280\u672f\u6765\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u3002\u8bf7\u770b\u4e0b\u9762\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u907f\u514djava.lang.NullPointerException\u3002<\/p>\n
    if<\/span>(<\/span>mutex ==<\/span>null<\/span>)<\/span> mutex =<\/span>\"\"<\/span>;<\/span> \/\/\u9884\u9632\u6027\u7f16\u7801<\/span>\r\n\t\t\r\nsynchronized<\/span>(<\/span>mutex)<\/span> {<\/span>\r\n\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\u540c\u6b65\u5757\"<\/span>)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \/\/\u4f7f\u7528\u7a7a\u68c0\u67e5<\/span>\r\nif<\/span>(<\/span>user!=<\/span>null<\/span> &&<\/span> user.<\/span>getUserName<\/span>(<\/span>)<\/span> !=<\/span>null<\/span>)<\/span> {<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\u7528\u6237\u540d: \"<\/span>+<\/span>user.<\/span>getUserName<\/span>(<\/span>)<\/span>.<\/span>toLowerCase<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n}<\/span>\r\nif<\/span>(<\/span>user!=<\/span>null<\/span> &&<\/span> user.<\/span>getUserName<\/span>(<\/span>)<\/span> !=<\/span>null<\/span>)<\/span> {<\/span>\r\n\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"\u7528\u6237ID: \"<\/span>+<\/span>user.<\/span>getUserId<\/span>(<\/span>)<\/span>.<\/span>toLowerCase<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u7f16\u7801\u6700\u4f73\u5b9e\u8df5<\/h2>\n
    \u8ba9\u6211\u4eec\u8003\u8651\u4ee5\u4e0b\u51fd\u6570\uff0c\u5e76\u5bfb\u627e\u53ef\u80fd\u5f15\u53d1\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u60c5\u51b5\u3002<\/p>\n
    public<\/span> void<\/span> foo<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>\r\n    if<\/span>(<\/span>s.<\/span>equals<\/span>(<\/span>\"Test\"<\/span>)<\/span>)<\/span> {<\/span>\r\n\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"test\"<\/span>)<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u5982\u679c\u5c06\u53c2\u6570\u4f20\u9012\u4e3anull\uff0c\u53ef\u80fd\u4f1a\u53d1\u751f\u7a7a\u6307\u9488\u5f02\u5e38\u3002\u4e3a\u4e86\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u53ef\u4ee5\u5c06\u540c\u6837\u7684\u65b9\u6cd5\u5199\u6210\u4ee5\u4e0b\u5f62\u5f0f\u3002<\/p>\n
    public<\/span> void<\/span> foo<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>\r\n\tif<\/span> (<\/span>\"Test\"<\/span>.<\/span>equals<\/span>(<\/span>s)<\/span>)<\/span> {<\/span>\r\n\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"test\"<\/span>)<\/span>;<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u6211\u4eec\u8fd8\u53ef\u4ee5\u5bf9\u53c2\u6570\u8fdb\u884c\u7a7a\u503c\u68c0\u67e5\uff0c\u5982\u679c\u9700\u8981\u7684\u8bdd\uff0c\u629b\u51fa\u975e\u6cd5\u53c2\u6570\u5f02\u5e38\u3002<\/p>\n
    public<\/span> int<\/span> getArrayLength<\/span>(<\/span>Object<\/span>[<\/span>]<\/span> array)<\/span> {<\/span>\r\n\t\r\n\tif<\/span>(<\/span>array ==<\/span> null<\/span>)<\/span> throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>\"array is null\"<\/span>)<\/span>;<\/span>\r\n\t\r\n\treturn<\/span> array.<\/span>length;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u6211\u4eec\u53ef\u4ee5\u50cf\u4e0b\u9762\u7684\u4f8b\u5b50\u4ee3\u7801\u4e00\u6837\u4f7f\u7528\u4e09\u5143\u8fd0\u7b97\u7b26\u3002<\/p>\n
    String<\/span> msg =<\/span> (<\/span>str ==<\/span> null<\/span>)<\/span> ?<\/span> \"\"<\/span> :<\/span> str.<\/span>substring<\/span>(<\/span>0<\/span>,<\/span> str.<\/span>length<\/span>(<\/span>)<\/span>-<\/span>1<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
    4. \u4f7f\u7528String.valueOf()\u65b9\u6cd5\u800c\u4e0d\u662ftoString()\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u68c0\u67e5\u6253\u5370\u6d41\u7684println()\u65b9\u6cd5\u7684\u4ee3\u7801\u5b9a\u4e49\u5982\u4e0b\u3002<\/p>\n
    public<\/span> void<\/span> println<\/span>(<\/span>Object<\/span> x)<\/span> {<\/span>\r\n        String<\/span> s =<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>x)<\/span>;<\/span>\r\n        synchronized<\/span> (<\/span>this<\/span>)<\/span> {<\/span>\r\n            print<\/span>(<\/span>s)<\/span>;<\/span>\r\n            newLine<\/span>(<\/span>)<\/span>;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n<\/code><\/pre>\n
    \u4ee5\u4e0b\u4ee3\u7801\u6bb5\u663e\u793a\u4e86\u4f7f\u7528valueOf()\u65b9\u6cd5\u800c\u4e0d\u662ftoString()\u65b9\u6cd5\u7684\u793a\u4f8b\u3002<\/p>\n
    Object<\/span> mutex =<\/span> null<\/span>;<\/span>\r\n\r\n\/\/ \u6253\u5370null<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>String<\/span>.<\/span>valueOf<\/span>(<\/span>mutex)<\/span>)<\/span>;<\/span>\r\n\r\n\/\/ \u5c06\u629b\u51fajava.lang.NullPointerException\u5f02\u5e38<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>mutex.<\/span>toString<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
    \u5c3d\u53ef\u80fd\u7f16\u5199\u8fd4\u56de\u7a7a\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u4f8b\u5982\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u7b26\u4e32\u7b49\uff0c\u800c\u4e0d\u662f\u8fd4\u56denull\u3002<\/p>\n
    \u5728\u96c6\u5408\u7c7b\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e9b\u65b9\u6cd5\u6765\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u4f60\u5e94\u8be5\u4f7f\u7528\u5b83\u4eec\u3002\u4f8b\u5982contains()\u65b9\u6cd5\u3001containsKey()\u65b9\u6cd5\u548ccontainsValue()\u65b9\u6cd5\u3002<\/p>\n
    \u53c2\u8003\uff1aAPI\u6587\u6863<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u8fd9\u662f\u6587\u7ae0\u300aJava \u7a7a\u6307\u9488\u5f02\u5e38 – \u68c0\u6d4b\u3001\u4fee\u590d\u548c\u6700\u4f73\u5b9e\u8df5\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51718\u90e8\u5206\uff09\u3002 java.la […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1196,1494,1495],"class_list":["post-497","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java"],"yoast_head":"\nJava\u7a7a\u6307\u9488\u5f02\u5e38\u5b8c\u5168\u89e3\u51b3\u6307\u5357\uff1a\u68c0\u6d4b\u3001\u4fee\u590d\u4e0e\u6700\u4f73\u5b9e\u8df5\u8be6\u89e3 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5168\u9762\u89e3\u6790Java\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u6210\u56e0\u4e0e\u89e3\u51b3\u65b9\u6848\u3002\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u68c0\u6d4bJava\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u63d0\u4f9b\u591a\u79cd\u4fee\u590d\u65b9\u6cd5\u548c\u5b9e\u7528\u4ee3\u7801\u793a\u4f8b\uff0c\u5e76\u5206\u4eab\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u6700\u4f73\u5b9e\u8df5\u3002\u5e2e\u52a9Java\u5f00\u53d1\u8005\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\uff0c\u51cf\u5c11\u8fd0\u884c\u65f6\u9519\u8bef\u3002\" \/>\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-\u7a7a\u6307\u9488\u5f02\u5e38-\u68c0\u6d4b\u3001\u4fee\u590d\u548c\u6700\u4f73\u5b9e\u8df5\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u7a7a\u6307\u9488\u5f02\u5e38\u5b8c\u5168\u89e3\u51b3\u6307\u5357\uff1a\u68c0\u6d4b\u3001\u4fee\u590d\u4e0e\u6700\u4f73\u5b9e\u8df5\u8be6\u89e3\" \/>\n<meta property=\"og:description\" content=\"\u5168\u9762\u89e3\u6790Java\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u6210\u56e0\u4e0e\u89e3\u51b3\u65b9\u6848\u3002\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u68c0\u6d4bJava\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u63d0\u4f9b\u591a\u79cd\u4fee\u590d\u65b9\u6cd5\u548c\u5b9e\u7528\u4ee3\u7801\u793a\u4f8b\uff0c\u5e76\u5206\u4eab\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u6700\u4f73\u5b9e\u8df5\u3002\u5e2e\u52a9Java\u5f00\u53d1\u8005\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\uff0c\u51cf\u5c11\u8fd0\u884c\u65f6\u9519\u8bef\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u7a7a\u6307\u9488\u5f02\u5e38-\u68c0\u6d4b\u3001\u4fee\u590d\u548c\u6700\u4f73\u5b9e\u8df5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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