{"id":31236,"date":"2022-11-10T08:00:27","date_gmt":"2023-04-19T10:05:16","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84optional-or%e6%98%af%e6%8c%87\/"},"modified":"2025-08-12T22:59:51","modified_gmt":"2025-08-12T14:59:51","slug":"java%e7%9a%84optional-or%e6%98%af%e6%8c%87","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84optional-or%e6%98%af%e6%8c%87\/","title":{"rendered":"Java\u7684Optional.or()\u662f\u6307"},"content":{"rendered":"

Java\u4e2d\u7684Optional\u7c7b\u7684.or()\u65b9\u6cd5\u662f\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5728Optional\u6ca1\u6709\u503c\uff08\u5373Optional.empty()\uff09\u65f6\u8fd4\u56de\u53e6\u4e00\u4e2aOptional\u3002<\/p>\n

\u8fd9\u4e2a\u65b9\u6cd5\u9700\u8981\u5c06Supplier\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u3002<\/p>\n

Supplier\u662fJava8\u5f15\u5165\u7684\u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5b83\u62e5\u6709\u4e00\u4e2a\u4e0d\u63a5\u53d7\u53c2\u6570\u4f46\u8fd4\u56de\u67d0\u4e2a\u503c\u7684get()\u65b9\u6cd5\u3002<\/p>\n

\u6837\u54c1\u2193<\/p>\n

Optional<String> optional = Optional.empty();\r\n\r\noptional = optional.or(() -> Optional.of(\"\u30b5\u30f3\u30d7\u30eb\"));\r\n<\/code><\/pre>\n
\u5728\u7b2c\u4e00\u884c\u4e2d\uff0coptional\u6ca1\u6709\u4efb\u4f55\u503c\uff08Optional.empty()\uff09\u3002
\n\u56e0\u6b64\uff0c\u5f53\u8c03\u7528or()\u65b9\u6cd5\u65f6\uff0c\u4f20\u9012\u7684Supplier\uff08\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u662f () -> Optional.of(“alternative”)\uff09\u4f1a\u88ab\u8c03\u7528\uff0c\u5e76\u4e14\u5b83\u7684\u7ed3\u679c\u5c06\u6210\u4e3a\u65b0\u7684optional\u503c\u3002
\n\u56e0\u6b64\uff0c\u6b64\u4ee3\u7801\u4e4b\u540e\uff0coptional\u5c06\u5177\u6709\u503c”\u6837\u672c”\u3002<\/p>\n
\u7136\u800c\uff0c\u5982\u679c\u539f\u672c\u7684optional\u5305\u542b\u4e00\u4e2a\u503c\uff08\u4f8b\u5982”original”\uff09\uff0c\u90a3\u4e48or()\u65b9\u6cd5\u5c06\u4e0d\u4f1a\u6539\u53d8\u8be5\u503c\uff0c\u800c\u662f\u76f4\u63a5\u8fd4\u56de\u539f\u59cb\u7684optional\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e0d\u4f1a\u8c03\u7528Supplier\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u4e2d\u7684Optional\u7c7b\u7684.or()\u65b9\u6cd5\u662f\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5728Optional\u6ca1\u6709\u503c\uff08\u5373Optional.emp […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31236","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nJava\u7684Optional.or()\u662f\u6307 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava\u7684Optional.or()\u662f\u6307\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\/java\u7684optional-or\u662f\u6307\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u7684Optional.or()\u662f\u6307\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eJava\u7684Optional.or()\u662f\u6307\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u7684optional-or\u662f\u6307\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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