{"id":202884,"date":"2025-05-22T10:56:30","date_gmt":"2025-05-22T02:56:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202884\/"},"modified":"2025-05-22T10:56:30","modified_gmt":"2025-05-22T02:56:30","slug":"java%e5%87%bd%e6%95%b0%e5%8f%82%e6%95%b0%e5%92%8c%e8%bf%94%e5%9b%9e%e5%80%bc%e7%b1%bb%e5%9e%8b%e7%9a%84%e9%ab%98%e7%ba%a7%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202884\/","title":{"rendered":"Java\u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u9ad8\u7ea7\u7528\u6cd5"},"content":{"rendered":"

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

Java\u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u9ad8\u7ea7\u7528\u6cd5<\/h1>\n

\u5b66\u4e60\u6587\u7ae0<\/span>\u8981\u52aa\u529b\uff0c\u4f46\u662f\u4e0d\u8981\u6025\uff01\u4eca\u5929\u7684\u8fd9\u7bc7\u6587\u7ae0\u300aJava\u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u9ad8\u7ea7\u7528\u6cd5\u300b<\/span>\u5c06\u4f1a\u4ecb\u7ecd\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60\u6587\u7ae0<\/span>\uff0c\u53ef\u4ee5\u5173\u6ce8\u6211\uff01\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\u7684\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u80fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

Java \u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u9ad8\u7ea7\u7528\u6cd5\u5305\u62ec\uff1a\u53c2\u6570\u7c7b\u578b\u8bf4\u660e\u7b26\uff08final\u3001@Nullable\u3001@NonNull\uff09\uff1a\u5f3a\u5236\u4f20\u9012\u7279\u5b9a\u7c7b\u578b\u7684\u503c\uff0c\u5b9e\u73b0\u4e0d\u53ef\u53d8\u6027\u3001\u53ef\u7a7a\u6027\u548c\u975e\u7a7a\u6027\u3002\u8fd4\u56de\u7c7b\u578b\u8bf4\u660e\u7b26\uff08@Pure\u3001@Nullable\u3001@NonNull\uff09\uff1a\u786e\u4fdd\u8fd4\u56de\u7684\u503c\u7b26\u5408\u9884\u671f\u7684\u7c7b\u578b\uff0c\u4f8b\u5982\u4e0d\u53ef\u53d8\u3001\u53ef\u7a7a\u6216\u975e\u7a7a\u3002\u901a\u8fc7\u7c7b\u578b\u8bf4\u660e\u7b26\uff0c\u53ef\u4ee5\u5b9e\u73b0\u6570\u636e\u5b8c\u6574\u6027\uff0c\u9632\u6b62 null \u503c\u5bfc\u81f4\u7684\u5f02\u5e38\u548c\u95ee\u9898\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u9ad8\u7ea7\u7528\u6cd5<\/h2>\n

\u5728 Java \u4e2d\uff0c\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u662f\u5b9a\u4e49\u51fd\u6570\u884c\u4e3a\u7684\u5173\u952e\u8981\u7d20\u3002\u638c\u63e1\u5b83\u4eec\u7684\u7528\u6cd5\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6548\u4e14\u53ef\u7ef4\u62a4\u7684\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002<\/p>\n

\u53c2\u6570\u7c7b\u578b\u8bf4\u660e<\/h3>\n

Java \u5141\u8bb8\u60a8\u5728\u51fd\u6570\u53c2\u6570\u7c7b\u578b\u524d\u9762\u6dfb\u52a0\u7c7b\u578b\u8bf4\u660e\u7b26\uff0c\u4ee5\u5f3a\u5236\u4f20\u9012\u7684\u503c\u7b26\u5408\u7279\u5b9a\u7684\u7c7b\u578b\u3002\u652f\u6301\u7684\u7c7b\u578b\u8bf4\u660e\u7b26\u5305\u62ec\uff1a<\/p>\n

    \n
  • final\uff1a<\/strong>\u8868\u793a\u53c2\u6570\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u4e0d\u80fd\u5728\u51fd\u6570\u5185\u4fee\u6539\u3002<\/li>\n
  • @Nullable\uff1a<\/strong>\u8868\u793a\u53c2\u6570\u53ef\u4ee5\u4e3a null\u3002<\/li>\n
  • @NonNull\uff1a<\/strong>\u8868\u793a\u53c2\u6570\u4e0d\u80fd\u4e3a null\u3002<\/li>\n<\/ul>\n

    \u4f8b\u5982\uff1a<\/p>\n

    public void process(final int value) {\n    \/\/ value cannot be modified\n}\n\npublic void processNullable(Account @Nullable account) {\n    \/\/ account can be null\n}<\/pre>\n
    \u8fd4\u56de\u503c\u7c7b\u578b\u8bf4\u660e<\/h3>\n
    \u4e0e\u53c2\u6570\u7c7b\u578b\u8bf4\u660e\u7b26\u7c7b\u4f3c\uff0c\u60a8\u53ef\u4ee5\u5728\u51fd\u6570\u8fd4\u56de\u503c\u7c7b\u578b\u524d\u9762\u6dfb\u52a0\u8fd4\u56de\u7c7b\u578b\u8bf4\u660e\u7b26\uff0c\u4ee5\u786e\u4fdd\u8fd4\u56de\u7684\u503c\u7b26\u5408\u9884\u671f\u7684\u7c7b\u578b\u3002\u652f\u6301\u7684\u8fd4\u56de\u7c7b\u578b\u8bf4\u660e\u7b26\u5305\u62ec\uff1a<\/p>\n
      \n
    • @Pure\uff1a<\/strong>\u8868\u793a\u51fd\u6570\u4e0d\u4f1a\u4ea7\u751f\u526f\u4f5c\u7528\uff08\u4f8b\u5982\uff0c\u4e0d\u4fee\u6539\u5916\u90e8\u72b6\u6001\uff09\u3002<\/li>\n
    • @Nullable\uff1a<\/strong>\u8868\u793a\u51fd\u6570\u53ef\u4ee5\u8fd4\u56de null\u3002<\/li>\n
    • @NonNull\uff1a<\/strong>\u8868\u793a\u51fd\u6570\u6c38\u8fdc\u4e0d\u4f1a\u8fd4\u56de null\u3002<\/li>\n<\/ul>\n
      \u4f8b\u5982\uff1a<\/p>\n
      @Pure\npublic int calculateSum() {\n    \/\/ always returns a non-null integer\n}\n\n@Nullable\npublic Person getPerson(String name) {\n    \/\/ may return null if no person with the specified name is found\n}<\/pre>\n
      \u5b9e\u6218\u6848\u4f8b<\/h3>\n
      \u4ee5\u4e0b\u662f\u4e00\u4e2a\u901a\u8fc7\u7c7b\u578b\u8bf4\u660e\u7b26\u5b9e\u73b0\u6570\u636e\u5b8c\u6574\u6027\u7684\u5b9e\u6218\u6848\u4f8b\uff1a<\/p>\n
      public void saveUser(User user) {\n    if (user == null) {\n        throw new IllegalArgumentException(\"User cannot be null\");\n    }\n\n    \/\/ Validate user properties...\n\n    \/\/ Save user to database\n}<\/pre>\n
      \u5728\u6b64\u793a\u4f8b\u4e2d\uff0c@NonNull<\/code> \u7c7b\u578b\u8bf4\u660e\u7b26\u5f3a\u5236\u8c03\u7528\u8005\u4f20\u9012\u975e\u7a7a User<\/code> \u5bf9\u8c61\u3002\u8fd9\u6709\u52a9\u4e8e\u9632\u6b62\u7531\u4e8e null \u503c\u5bfc\u81f4\u7684\u7a7a\u6307\u9488\u5f02\u5e38\u548c\u6570\u636e\u5b8c\u6574\u6027\u95ee\u9898\u3002<\/p>\n
      \u6ce8\u610f\u4e8b\u9879<\/h3>\n
      \u8bf7\u6ce8\u610f\uff0c\u7c7b\u578b\u8bf4\u660e\u7b26\u5728 Java \u4e2d\u4e0d\u662f\u5f3a\u5236\u6027\u7684\u3002\u4f46\u662f\uff0c\u5f3a\u70c8\u5efa\u8bae\u5728\u9002\u5f53\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u5b83\u4eec\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u7b80\u6d01\u6027\u3001\u53ef\u8bfb\u6027\u548c\u6b63\u786e\u6027\u3002<\/p>\n
      \u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300aJava\u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u9ad8\u7ea7\u7528\u6cd5\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\u53c2\u6570\u7c7b\u578b,\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      Java\u51fd\u6570\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u9ad8...<\/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-202884","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202884","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=202884"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202884\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202884"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202884"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}