{"id":4085,"date":"2022-12-13T13:40:20","date_gmt":"2022-12-13T05:40:20","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=4085"},"modified":"2022-12-13T13:40:20","modified_gmt":"2022-12-13T05:40:20","slug":"optional%e7%94%a8%e6%b3%95%e4%b8%8e%e4%ba%89%e8%ae%ae%e7%82%b9","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=4085","title":{"rendered":"Optional\u7528\u6cd5\u4e0e\u4e89\u8bae\u70b9"},"content":{"rendered":"\n

\u53ef\u4ee5\u7528\uff0c\u4f46\u662f\u4e3b\u8981\u4e0d\u8981\u6ee5\u7528\u3002<\/p>\n\n\n\n

\u539f\u6587\uff1aOptional\u7528\u6cd5\u4e0e\u4e89\u8bae\u70b9 – \u6398\u91d1 (juejin.cn)<\/a><\/p>\n\n\n\n

\u7b80\u4ecb<\/h2>\n\n\n\n

\u8981\u8bf4Java\u4e2d\u4ec0\u4e48\u5f02\u5e38\u6700\u5bb9\u6613\u51fa\u73b0\uff0c\u6211\u60f3NullPointerException\u4e00\u5b9a\u5f53\u4ec1\u4e0d\u8ba9\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u79cdnull\u503c\u5224\u65ad\u95ee\u9898\uff0cJava8\u4e2d\u63d0\u4f9b\u4e86\u4e00\u4e2a\u65b0\u7684\u5de5\u5177\u7c7bOptional\uff0c\u7528\u4e8e\u63d0\u793a\u7a0b\u5e8f\u5458\u6ce8\u610fnull\u503c\uff0c\u5e76\u5728\u7279\u5b9a\u573a\u666f\u4e2d\u7b80\u5316\u4ee3\u7801\u903b\u8f91\u3002<\/p>\n\n\n\n

\u6bd4\u5982\u4e0b\u9762\u4e00\u6bb5\u53d6\u6df1\u5c42\u5c5e\u6027\u503c\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n

Order order = getOrderById(orderId);\nString userCode = \"\";\nif(order != null){\n    if(order.getUser() != null){\n        if(order.getUser().getUserCode() != null){\n            userCode = order.getUser().getUserCode().toUpperCase();\n        }\n    }\n}\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u8fd9\u79cd\u573a\u666f\u8fd8\u6bd4\u8f83\u5e38\u89c1\uff0c\u4f46\u6df1\u5c42\u5d4c\u5957\u7684if\u5224\u65ad\uff0c\u8ba9\u4ee3\u7801\u9605\u8bfb\u8005\u538b\u529b\u500d\u589e\u3002<\/p>\n\n\n\n
\u770b\u770b\u7528Optional\u540e\u7684\u5199\u6cd5\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
Order order = getOrderById(orderId);\nString userCode = Optional.ofNullable(order)\n    .map(Order::getUser)\n    .map(User::getUserCode)\n    .map(String::toUpperCase)\n    .orElse(\"\")\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u94fe\u5f0f\u8c03\u7528\u7684\u5199\u6cd5\uff0c\u8ba9\u4ee3\u7801\u53ef\u8bfb\u6027\u589e\u5f3a\u4e86\u4e0d\u5c11\uff0c\u4e0d\u7528\u5224\u65adnull\uff0c\u662f\u56e0\u4e3aOptional\u5728\u5185\u90e8\u5df2\u7ecf\u505a\u4e86null\u503c\u5224\u65ad\u4e86\uff01\u90a3\u6211\u4eec\u6765\u770b\u770bOptional\u90fd\u6709\u54ea\u4e9b\u7528\u6cd5\u5427\u3002<\/p>\n\n\n\n
\u521b\u5efaOptional<\/h2>\n\n\n\n
ofNullable()\u65b9\u6cd5<\/strong>
\u521b\u5efa\u4e00\u4e2aOptional\uff0c\u4f20\u5165\u7684\u503c\u53ef\u4ee5\u662fnull\u6216\u4e0d\u662fnull\u3002<\/p>\n\n\n\n
of()\u65b9\u6cd5<\/strong>
\u5f97\u5230\u4e00\u4e2aOptional\uff0c\u660e\u786e\u77e5\u9053\u4f20\u5165\u7684\u503c\u4e0d\u662fnull\u65f6\u7528\u8fd9\u4e2a\uff0c\u5982\u679c\u4f20null\u4f1a\u62a5\u9519NullPointerExcepiton\u3002
\u5176\u5b9e\u503c\u4e0d\u4e3anull\u4e00\u822c\u662f\u6ca1\u5fc5\u8981\u4f7f\u7528Optional\u7684\uff0c\u8fd9\u4e2a\u5e94\u8be5\u662f\u7528\u4e8e\u7279\u6b8a\u573a\u666f\uff0c\u6bd4\u5982\u65b9\u6cd5\u8fd4\u56de\u503c\u5fc5\u987b\u662f\u4e00\u4e2aOptional\u3002<\/p>\n\n\n\n
empty()\u65b9\u6cd5<\/strong>
\u5f97\u5230\u4e00\u4e2a\u7a7a\u7684Optional\uff0c\u4e00\u822c\u4e5f\u7528\u4e8e\u8fd4\u56de\u503c\u5fc5\u987b\u662fOptional\u7684\u573a\u666f\u3002<\/p>\n\n\n\n
\u5224\u7a7a<\/h2>\n\n\n\n
ifPresent()\u65b9\u6cd5<\/strong>
\u5224\u65ad\u662f\u5426\u6709\u503c\uff0c\u6ce8\u610f\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u867d\u7136\u770b\u8d77\u6765\u633a\u597d\u7528\u7684\uff0c\u4f46\u5b83\u4e0d\u592a\u5e94\u8be5\u662f\u4f7f\u7528Optional\u65f6\u7b2c\u4e00\u4e2a\u4f7f\u7528\u7684\u65b9\u6cd5\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
if(opt.ifPresent())\uff5b\n    ...\n\uff5d\nif(obj != null) {\n    ...\n}\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u8fd9\u4e24\u4e2a\u4ee3\u7801\u9664\u4e86\u5199\u6cd5\u4e0d\u4e00\u6837\uff0c\u5bf9\u4e8e\u4ee3\u7801\u53ef\u8bfb\u6027\u65b9\u9762\u6ca1\u6709\u6839\u672c\u533a\u522b\uff01<\/p>\n\n\n\n
\u53d6\u503c<\/h2>\n\n\n\n
get()\u65b9\u6cd5<\/strong>
\u83b7\u53d6Optional\u7684\u503c\uff0c\u5f53\u6ca1\u6709\u503c\u65f6\u4f1a\u629b\u51fa\u4e00\u4e2aNoSuchElementException\u5f02\u5e38\u3002
\"image_2022-11-06_20221106180845\"
\u540c\u6837\u7684\uff0c\u5b83\u4e5f\u4e0d\u592a\u5e94\u8be5\u662f\u4f7f\u7528Optional\u65f6\u7684\u7b2c\u4e00\u4e2a\u4f7f\u7528\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u629bNoSuchElementException\u4e0e\u629bNullPointerException\u5e76\u6ca1\u6709\u592a\u5927\u533a\u522b\u3002<\/p>\n\n\n\n
orElse\u65b9\u6cd5<\/strong>
\u6ca1\u6709\u503c\u65f6\u4f1a\u8fd4\u56de\u6307\u5b9a\u7684\u503c\u3002<\/p>\n\n\n\n
String name = nameOpt.orElse(\"\");\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
orElseGet\u65b9\u6cd5<\/strong>
\u540c\u4e0a\uff0c\u4e0d\u8fc7\u53c2\u6570\u53d8\u6210\u4e86\u4e00\u4e2a\u63d0\u4f9b\u9ed8\u8ba4\u503c\u7684lambda\u51fd\u6570\uff0c\u8fd9\u7528\u5728\u53d6\u6307\u5b9a\u503c\u9700\u8981\u4e00\u5b9a\u4ee3\u4ef7\u7684\u573a\u666f\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
BigDecimal amount = amountOpt.orElseGet(() -> calcDefaultAmount());\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
orElseThrow\u65b9\u6cd5<\/strong>
\u6ca1\u6709\u503c\u65f6\u629b\u51fa\u4e00\u4e2a\u6307\u5b9a\u7684\u5f02\u5e38\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
Optional<User> userOpt = getUser(userId);\nUser user = userOpt.orElseThrow(() -> new NullPointerException(\"userId:\" + userId));\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
\u53ef\u80fd\u4f1a\u6709\u4eba\u7591\u95ee\uff0c\u4f60\u8fd8\u662f\u629b\u51fa\u4e86\u4e00\u4e2aNPE\u5f02\u5e38\uff0c\u548c\u4e0d\u4f7f\u7528Optional\u6709\u5565\u533a\u522b\uff1f\u533a\u522b\u662f\u8fd9\u4e2aNPE\u5f02\u5e38\u4f1a\u544a\u8bc9\u4f60\u54ea\u4e2auserId\u67e5\u4e0d\u5230\u6570\u636e\uff0c\u65b9\u4fbf\u5b9a\u4f4d\u95ee\u9898\uff0c\u800cjvm\u629b\u51fa\u7684NPE\u662f\u6ca1\u6709\u8fd9\u4e2a\u4fe1\u606f\u7684\u3002<\/p>\n\n\n\n
\u51fd\u6570\u5f0f\u5904\u7406<\/h2>\n\n\n\n
ifPresent(Consumer<? super T> consumer)\u65b9\u6cd5<\/strong>
\u8fd9\u4e2a\u65b9\u6cd5\u548cifPresent()<\/code>\u65b9\u6cd5\u4e0d\u4e00\u6837\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4ee3\u8868\u5982\u679cOptional\u6709\u503c\u65f6\uff0c\u5c31\u6267\u884c\u4f20\u5165\u7684lambda\u51fd\u6570\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
userOpt.ifPresent((user) -> System.out.printf(\"%s\\n\", user.toString()));\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
filter\u65b9\u6cd5<\/strong>
\u8fd9\u4e2a\u65b9\u6cd5\u7528\u4e8e\u8fc7\u6ee4Optional\u4e2d\u7684\u503c\uff0c\u82e5Optional\u6709\u503c\uff0c\u4e14\u503c\u6ee1\u8db3\u8fc7\u6ee4\u51fd\u6570\uff0c\u5219\u8fd4\u56de\u6b64Optional\uff0c\u5426\u5219\u8fd4\u56de\u7a7aOptional\u3002
\"image_2022-11-06_20221106200230\"<\/p>\n\n\n\n
String name = nameOpt.filter(StringUtils::isNotBlank).orElse(\"\");\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
map\u65b9\u6cd5<\/strong>
\u8fd9\u4e2a\u65b9\u6cd5\u7528\u4e8e\u8f6c\u6362\u503c\uff0c\u5728\u6700\u524d\u9762\u5df2\u7ecf\u5c55\u793a\u8fc7\u4e86\uff0c\u82e5Optional\u6709\u503c\uff0c\u6267\u884cmap\u4e2d\u7684lambda\u51fd\u6570\u8f6c\u6362\u503c\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
Order order = getOrderById(orderId);\nString userCode = Optional.ofNullable(order)\n    .map(Order::getUser)\n    .map(User::getUserCode)\n    .map(String::toUpperCase)\n    .orElse(\"\")\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
Optional\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e2aflatMap\u65b9\u6cd5\uff0c\u4e0emap\u65b9\u6cd5\u7684\u533a\u522b\u662f\uff0c\u4f20\u7ed9flatMap\u7684lambda\u51fd\u6570\uff0c\u8fd9\u4e2alambda\u51fd\u6570\u7684\u8fd4\u56de\u503c\u9700\u8981\u662fOptional\u3002<\/p>\n\n\n\n
Optional\u4e89\u8bae\u70b9<\/h2>\n\n\n\n
\u5176\u5b9e\u5230\u5e95\u8be5\u4e0d\u8be5\u7528Optional\uff0c\u4e1a\u754c\u8fd8\u662f\u6709\u4e0d\u5c11\u4e89\u8bae\u7684\uff0c\u4e00\u65b9\u9762\u662fOptional\u80fd\u5f3a\u8feb\u5f00\u53d1\u8005\u5904\u7406null\u503c\uff0c\u4f46\u53e6\u4e00\u65b9\u9762\u662fOptional\u53c8\u975e\u5e38\u5bb9\u6613\u6ee5\u7528\uff0c\u7279\u522b\u662f\u4e00\u4e9b\u5f00\u53d1\u8005\u62ff\u5230Optional\u4e4b\u540e\u5c31\u76f4\u63a5\u8c03\u7528get()<\/code>\u6216ifPresent()<\/code>\u65b9\u6cd5\uff0c\u8fd9\u6837\u51e0\u4e4e\u6ca1\u89e3\u51b3\u4efb\u4f55\u95ee\u9898\uff0c\u8fd8\u52a0\u91cd\u4e86\u7f16\u7801\u8d1f\u62c5\u3002<\/p>\n\n\n\n
\u56e0\u6b64\uff0c\u6211\u7684\u5efa\u8bae\u662f\uff0c\u5728\u4f60\u4e0d\u77e5\u9053\u8be5\u4e0d\u8be5\u4f7f\u7528Optional\u7684\u573a\u666f\uff0c\u90a3\u5c31\u5148\u522b\u7528\u3002<\/p>\n\n\n\n
\u4e0b\u9762\u662f\u4e00\u4e9b\u4f7f\u7528Optional\u7684\u573a\u666f\u53c2\u8003\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    \n
  1. Optional\u4e00\u822c\u7528\u4e8e\u8fd4\u56de\u503c
    Optional\u5927\u591a\u7528\u4e8e\u8fd4\u56de\u503c\uff0c\u4e0d\u63a8\u8350\u7528\u5728\u6210\u5458\u53d8\u91cf\u6216\u65b9\u6cd5\u53c2\u6570\u4e2d\u3002<\/li>\n\n\n\n
  2. Optional\u672c\u8eab\u4e0d\u5224null
    \u6c38\u8fdc\u90fd\u4e0d\u8981\u7ed9Optional\u8d4b\u503cnull\uff0c\u4e5f\u4e0d\u8981\u5224\u65adOptional\u672c\u8eab\u662f\u5426\u4e3anull\uff0c\u8fd9\u662f\u56e0\u4e3aOptional\u672c\u6765\u5c31\u662f\u89e3\u51b3null\u7684\uff0c\u518d\u5f15\u5165null\u5c31\u6ca1\u610f\u601d\u4e86\uff0c\u8fd9\u5e94\u8be5\u6210\u4e3a\u4e1a\u754c\u5171\u8bc6\u3002<\/li>\n\n\n\n
  3. \u96c6\u5408\u4e0d\u4f7f\u7528Optional
    \u56e0\u4e3a\u96c6\u5408\u6709Collections.emptyList()<\/code>\u7b49\u66f4\u597d\u7684\u5904\u7406\u65b9\u6cd5\u4e86\uff0c\u6ca1\u5fc5\u8981\u518d\u4f7f\u7528Optional\u3002<\/li>\n\n\n\n
  4. \u51fd\u6570\u5f0f\u5904\u7406\u503c
    \u4ece\u4e0a\u9762\u7684\u7528\u6cd5\u4ecb\u7ecd\u4e2d\u5c31\u80fd\u53d1\u73b0\uff0cOptional\u63d0\u4f9b\u4e86\u5f88\u591alambda\u51fd\u6570\u5f0f\u5904\u7406\u7684\u65b9\u6cd5\uff0c\u5982filter\u3001map\u7b49\uff0c\u8fd9\u4e9b\u662f\u4f7f\u7528Optional\u65f6\u6bd4\u8f83\u63a8\u8350\u4f7f\u7528\u7684\uff0c\u56e0\u4e3aOptional\u80fd\u5e2e\u4f60\u81ea\u52a8\u5904\u7406null\u503c\u60c5\u51b5\uff0c\u907f\u514dNPE\u5f02\u5e38\u3002<\/li>\n\n\n\n
  5. \u591a\u5c42\u5c5e\u6027\u83b7\u53d6
    \u524d\u9762\u4e3e\u8fc7\u8fd9\u4e2a\u4ee3\u7801\u6837\u4f8b\uff0c\u6211\u89c9\u5f97\u8fd9\u662fOptional\u4f7f\u7528\u6536\u76ca\u6700\u660e\u663e\u7684\u4e00\u4e2a\u573a\u666f\u3002<\/li>\n\n\n\n
  6. \u4e0d\u8fd4\u56denull\u80dc\u8fc7\u8fd4\u56deOptional
    \u8fd4\u56deOptional\u7ed9\u8c03\u7528\u65b9\uff0c\u4f1a\u5f3a\u5236\u8c03\u7528\u65b9\u5904\u7406null\u60c5\u51b5\uff0c\u4f1a\u7ed9\u8c03\u7528\u65b9\u589e\u52a0\u4e00\u4e9b\u7684\u7f16\u7801\u8d1f\u62c5\uff0c\u7279\u522b\u662f\u590d\u7528\u5ea6\u5f88\u9ad8\u7684\u51fd\u6570\u3002
    \u4f46\u5982\u679c\u8c03\u7528\u65b9\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u90fd\u4e0d\u671f\u671b\u83b7\u53d6\u5230null\uff0c\u90a3\u5e94\u8be5\u5b9e\u73b0\u4e00\u4e2a\u8fd9\u6837\u7684\u65b9\u6cd5\uff0c\u8981\u4e48\u8fd4\u56de\u503c\uff0c\u8981\u4e48\u5f02\u5e38\uff0c\u5982\u4e0b\uff1a<\/li>\n<\/ol>\n\n\n\n
    \/**\n * \u67e5\u8be2\u8ba2\u5355\uff0c\u8981\u4e48\u8fd4\u56de\u8ba2\u5355\uff0c\u8981\u4e48\u5f02\u5e38\n *\/\npublic Order getOrderByIdOrExcept(Long orderId){\n    Order order = orderMapper.getOrderById(orderId);\n    if(order == null){\n        throw new BizException(\"\u6839\u636e\u5355\u53f7\" + orderId + \"\u672a\u67e5\u8be2\u5230\u8ba2\u5355\uff01\");\n    }\n    return order;\n}\n\n\/**\n * \u67e5\u8be2\u8ba2\u5355\uff0c\u503c\u53ef\u80fd\u4e3anull\n *\/\npublic Optional<Order> getOrderById(Long orderId){\n    Order order = orderMapper.getOrderById(orderId);\n    return Optional.ofNullable(order);\n}\n\u590d\u5236\u4ee3\u7801<\/code><\/pre>\n\n\n\n
    \u7531\u4e8e\u540e\u9762\u5904\u7406\u4ee3\u7801\u4f9d\u8d56\u8ba2\u5355\u6570\u636e\uff0c\u83b7\u53d6\u4e0d\u5230\u8ba2\u5355\u6570\u636e\uff0c\u4ee3\u7801\u4e5f\u6ca1\u6cd5\u5f80\u4e0b\u8d70\uff0c\u6240\u4ee5\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u9009\u62e9\u4f7f\u7528getOrderByIdOrExcept<\/code>\u65b9\u6cd5\u66f4\u597d\uff0c\u5373\u907f\u514d\u4e86NPE\uff0c\u53c8\u907f\u514d\u4e86\u589e\u52a0\u7f16\u7801\u8d1f\u62c5\uff01<\/p>\n\n\n\n
    \u603b\u7ed3<\/h2>\n\n\n\n
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