{"id":31576,"date":"2023-05-14T11:47:19","date_gmt":"2023-04-25T14:03:00","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e5%8f%af%e9%80%89%e8%ae%b0%e5%bd%95\/"},"modified":"2024-04-30T04:06:40","modified_gmt":"2024-04-29T20:06:40","slug":"%e3%80%90java%e3%80%91%e5%8f%af%e9%80%89%e8%ae%b0%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e3%80%91%e5%8f%af%e9%80%89%e8%ae%b0%e5%bd%95\/","title":{"rendered":"\u3010Java\u3011\u53ef\u9009\u8bb0\u5f55"},"content":{"rendered":"<h1>\u5728\u4e2d\u56fd\uff0c\u4e0d\u4e0e\u9057\u7559\u4ee3\u7801\u76f8\u5173\u7684\u53ef\u9009\u9879<\/h1>\n<p>\u6700\u8fd1\u7b2c\u4e00\u6b21\u5728\u5de5\u4f5c\u4e2d\u4f7f\u7528\u4e86\uff0c\u611f\u5230\u975e\u5e38\u5f00\u5fc3\uff0c\u6240\u4ee5\u4e3a\u4e86\u4ee5\u540e\u4e5f\u80fd\u591f\u4f7f\u7528\uff0c\u505a\u4e86\u4f7f\u7528\u793a\u4f8b\u7684\u5907\u5fd8\u5f55\u3002<\/p>\n<p>\u6211\u5728\u4e00\u4e2a2019\u5e74\u7684\u5168\u65b0\u9879\u76ee\u4e2d\uff0c\u5de5\u4f5c\u5730\u65b9\u8981\u6c42\u4f7f\u7528Java1.6\u7248\u672c\u3002\u8fc4\u4eca\u4e3a\u6b62\uff0c\u6211\u6ca1\u6709\u592a\u591a\u63a5\u89e6Java8\u7684\u673a\u4f1a\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u5199\u4e86\u4e00\u4e9b\u5173\u4e8eJava8\u7684\u4fe1\u606f\uff0c\u542c\u8bf4\u4eceJava8\u5f00\u59cb\uff0c\u7a7a\u6307\u9488\u68c0\u67e5\u53d8\u5f97\u66f4\u7b80\u5355\u3002\u6211\u5df2\u7ecf\u67e5\u770b\u4e86\u591a\u4e2a\u7f51\u7ad9\u4ee5\u786e\u4fdd\u51c6\u786e\u6027\uff0c\u4f46\u5982\u679c\u6709\u4efb\u4f55\u66f4\u597d\u7684\u5efa\u8bae\u6216\u6539\u5584\u65b9\u6cd5\uff0c\u8bf7\u52a1\u5fc5\u7559\u4e0b\u8bc4\u8bba\u3002\uff08\u7531\u4e8e\u9879\u76ee\u4e2d\u6ca1\u6709\u4eba\u53ef\u4ee5\u5bf9\u6211\u7684\u4ee3\u7801\u8fdb\u884c\u5ba1\u67e5\uff0c\u6240\u4ee5\u6211\u8d1f\u8d23\u5ba1\u6838\u5176\u4ed6\u6210\u5458\u7684\u4ee3\u7801\u3002\uff09<\/p>\n<h2>\u5173\u4e8e&#8221;get&#8221;\u7684\u5185\u5bb9<\/h2>\n<p>\u7531\u4e8e\u4e0d\u77e5\u9053\u8be5\u5982\u4f55\u4f7f\u7528\uff0c\u6240\u4ee5\u6211\u6ca1\u6709\u4f7f\u7528\u3002<br \/>\n\u6211\u770b\u4e86\u4e00\u4e9b\u7f51\u7ad9\u540e\uff0c\u53d1\u73b0\u4e86\u201c\u4e0d\u8981\u8fc7\u5ea6\u4f7f\u7528get\u201d\u7684\u89c2\u70b9\uff0c\u6240\u4ee5\u76f8\u53cd\uff0c\u53ef\u80fd\u662f\u6b63\u786e\u7684\u9009\u62e9\u5427\uff1f\u6709\u8fd9\u6837\u7684\u611f\u89c9\u3002<\/p>\n<h1>\u8bf7\u7559\u610f<\/h1>\n<p>\u300cOptional\u306f\u3001\u5358\u7d14\u306b\u5f93\u6765\u306enull\u30c1\u30a7\u30c3\u30af\u3092\u7f6e\u63db\u3067\u304d\u308b\u3068\u3044\u3046\u8a8d\u8b58\u306f\u9593\u9055\u3044\u3067\u3057\u305f\u3002\u5b9f\u969b\u306b\u306f\u3001Optional\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u5fd8\u308c\u308b\u53ef\u80fd\u6027\u3092\u306a\u304f\u3059\u305f\u3081\u306b\u3001null\u30c1\u30a7\u30c3\u30af\u3092\u5f37\u5236\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u52d5\u4f5c\u3059\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u66f8\u304b\u308c\u305f\u30b3\u30fc\u30c9\u306f\u6b63\u3057\u3044\u4f7f\u7528\u65b9\u6cd5\u3068\u306f\u8a00\u3048\u307e\u305b\u3093\u3002\u3053\u306e\u8a18\u4e8b\u3092\u524a\u9664\u305b\u305a\u306b\u6b8b\u3059\u7406\u7531\u306f\u3001\u521d\u3081\u3066Optional\u3092\u4f7f\u3046\u4eba\u304c\u5f15\u3063\u304b\u304b\u3089\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3067\u3059\u3002@sikani\u3055\u3093\u3001\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\uff01\u3084\u306f\u308a\u5c02\u9580\u5bb6\u306b\u30ec\u30d3\u30e5\u30fc\u3057\u3066\u3082\u3089\u308f\u306a\u3044\u3068\u3044\u3051\u307e\u305b\u3093\u306d\u3002\u4ed6\u4eba\u306e\u30ec\u30d3\u30e5\u30fc\u3067\u3001Optional\u3067\u66f8\u304f\u3053\u3068\u3092\u6307\u6458\u3057\u3066\u3044\u306a\u304b\u3063\u305f\u306e\u306f\u3001\u4e0d\u904b\u4e2d\u306e\u5e78\u3044\u3067\u3057\u305f\u3002\uff08Java8\u306e\u30b3\u30fc\u30c9\u3092\u5f37\u5236\u3055\u308c\u306a\u3044\u30b1\u30fc\u30b9\u306a\u306e\u3067\uff09\u300d<\/p>\n<h1>\u793a\u4f8b\u4ee3\u7801<\/h1>\n<p>Java1.6\u7279\u610f\u4f7f\u7528\u4e86\u4e00\u4e9b\u4e0d\u597d\u7684\u5199\u6cd5\u3002Java8\u5199\u5f97\u5f88\u7b80\u6d01\u3002<br \/>\n\u867d\u7136Java8\u7684\u7528\u6cd5\u6709\u70b9\u9519\u8bef\u3002<br \/>\nJava1.6\u4e5f\u53ef\u4ee5\u7528\u4e09\u5143\u8fd0\u7b97\u7b26\u4e00\u884c\u5199\u5b8c\uff0c\u4f46\u662fret\u53ea\u662f\u591a\u4f59\u7684\uff0c\u8fde\u65e9\u65e9\u8fd4\u56de\u90fd\u4e0d\u505a\uff0c\u53cd\u800c\u4f7f\u7528if-else\uff0c\u79c1\u6709\u65b9\u6cd5\u4e5f\u4e0d\u65ad\u5199if\u8bed\u53e5\u7684\u7c7b\u578b\u7684\u9879\u76ee\u4e2d\uff0c\u7edd\u5927\u90e8\u5206\u90fd\u662f\u7cdf\u7cd5\u7684\u9057\u7559\u4ee3\u7801\uff0c\u6bcf\u6b21\u91cd\u6784\u90fd\u8ba9\u6211\u5fc3\u529b\u4ea4\u7601\u3002\u66f4\u4e0d\u7528\u8bf4\u4f7f\u7528Java8\u4e86\uff0c\u4f46\u662f\u4ecd\u6709\u592a\u591a\u6210\u5458\u4ecd\u7136\u4f7f\u7528Java1.6\u7684\u5199\u6cd5\uff0c\u771f\u662f\u8ba9\u4eba\u4e0d\u7981\u54c8\u54c8\u5927\u7b11\u3002\u6211\u62c5\u5fc3\u88ab\u8bef\u89e3\u4e3a\u662f\u81ea\u50b2\u7684\u4eba\u3002\u3002\u6211\u60f3\u8d77\u6700\u8fd1\u70ed\u706b\u671d\u5929\u7684\u9ad8\u4e0b\u8bba\u6218\u3002\u771f\u62b1\u6b49\u6211\u5728\u53d1\u7262\u9a9a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">toStringIfNotNull<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"nc\">Object<\/span> <span class=\"n\">obj<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">ret<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">obj<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">ret<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">ret<\/span> <span class=\"o\">=<\/span> <span class=\"n\">obj<\/span><span class=\"o\">.<\/span><span class=\"na\">toString<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">ret<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">toStringIfNotNull<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"nc\">Object<\/span> <span class=\"n\">obj<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nc\">Optional<\/span><span class=\"o\">.<\/span><span class=\"na\">ofNullable<\/span><span class=\"o\">(<\/span><span class=\"n\">obj<\/span><span class=\"o\">).<\/span><span class=\"na\">map<\/span><span class=\"o\">(<\/span><span class=\"nl\">Object:<\/span><span class=\"o\">:<\/span><span class=\"n\">toString<\/span><span class=\"o\">).<\/span><span class=\"na\">orElse<\/span><span class=\"o\">(<\/span><span class=\"kc\">null<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4f7f\u7528Optional\u800c\u4e0d\u662f\u7a7a\u503c\u68c0\u67e5\uff0c\u90a3\u4e48\u4f7f\u7528ofNullable\u548corElse\u7684\u7ec4\u5408\u662f\u5426\u662f\u6700\u4f73\u9009\u62e9\u5462\uff1f\u6211\u6709\u8fd9\u6837\u7684\u5370\u8c61\u3002\u5982\u679c\u975e\u7a7a\uff0c\u53ea\u9700\u5c06\u539f\u59cb\u503c\u76f4\u63a5\u8fd4\u56de\uff0c\u8fd9\u6837\u5c31\u4e0d\u9700\u8981map\u6216\u5176\u4ed6\u4e2d\u95f4\u5904\u7406\u4e86\u3002<\/p>\n<p>\u9664\u4e86 map \u4e4b\u5916\uff0c\u8fd8\u6709 filter \u548c flatMap\u3002<\/p>\n<p>\u5f53 filter \u7ed3\u679c\u4e3a null \u6216 false \u65f6\uff0c\u8fd4\u56de orElse \u7684\u53c2\u6570\u3002<\/p>\n<p>\u5f53 flatMap \u7ed3\u679c\u4e3a null \u65f6\uff0c\u8fd4\u56de orElse \u7684\u53c2\u6570\uff0c\u4f46\u662f\u5f53 flatMap \u5904\u7406\u7684\u7ed3\u679c\u4e3a null \u65f6\uff0c\u4f1a\u629b\u51fa NullPointerException\u3002\uff08\u5bf9\u4e8e map \uff0c\u5373\u4f7f\u5904\u7406\u7ed3\u679c\u4e3a null\uff0c\u4e5f\u4f1a\u8fd4\u56de orElse \u7684\u53c2\u6570\uff09<\/p>\n<p>\u5982\u679c\u8981\u6839\u636enull\u4e0e\u5426\u6765\u5206\u652f\u5904\u7406\uff0c\u636e\u8bf4\u53ef\u4ee5\u5199\u6210if (Optional.ofNullable(obj).isPresent())\uff01<br \/>\n\u53e6\u5916\uff0cisPresent\u53ea\u8fd4\u56de\u5e03\u5c14\u503c\uff0c\u4f46\u5982\u679c\u6539\u6210ifPresent\u5e76\u4f20\u5165\u4e00\u4e2alambda\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53c2\u6570\uff0c\u90a3\u4e48\u53ea\u6709\u5728\u975enull\u60c5\u51b5\u4e0b\u624d\u4f1a\u6267\u884c\u8be5\u53c2\u6570\u7684lambda\u8868\u8fbe\u5f0f\uff0c\u636e\u8bf4\u53ef\u4ee5\u8fd9\u6837\u5199\u3002<br \/>\n\u4e0d\u8fc7\uff0c\u5982\u679c\u662fJava 7\u6216\u66f4\u9ad8\u7248\u672c\u7684\u8bdd\uff0c\u6211\u89c9\u5f97\u7528if (Objects.isNull(obj))(nonNull)\u6765\u5206\u652f\u4f1a\u66f4\u7b80\u6d01\u3002<\/p>\n<p>\u5199\u5230\u8fd9\u91cc\u6211\u624d\u610f\u8bc6\u5230\uff0c\u5982\u679c\u662f\u5904\u7406\u793a\u4f8b\u4ee3\u7801\u7684\u5185\u5bb9\u7684\u8bdd\uff0c\u53ef\u4ee5\u7528Objects.toString(obj, null)\uff08\u7c7b\u4f3c\u4e8eStringUtils.defaultString\uff09\u5c31\u53ef\u4ee5\u4e86&#8230;\u6211\u786e\u8ba4\u5f97\u4e0d\u591f\u4ed4\u7ec6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4e2d\u56fd\uff0c\u4e0d\u4e0e\u9057\u7559\u4ee3\u7801\u76f8\u5173\u7684\u53ef\u9009\u9879 \u6700\u8fd1\u7b2c\u4e00\u6b21\u5728\u5de5\u4f5c\u4e2d\u4f7f\u7528\u4e86\uff0c\u611f\u5230\u975e\u5e38\u5f00\u5fc3\uff0c\u6240\u4ee5\u4e3a\u4e86\u4ee5\u540e\u4e5f\u80fd\u591f\u4f7f\u7528\uff0c\u505a\u4e86\u4f7f\u7528\u793a\u4f8b [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31576","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010Java\u3011\u53ef\u9009\u8bb0\u5f55 - Blog - Silicon Cloud<\/title>\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\/\u3010java\u3011\u53ef\u9009\u8bb0\u5f55\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Java\u3011\u53ef\u9009\u8bb0\u5f55\" \/>\n<meta property=\"og:description\" content=\"\u5728\u4e2d\u56fd\uff0c\u4e0d\u4e0e\u9057\u7559\u4ee3\u7801\u76f8\u5173\u7684\u53ef\u9009\u9879 \u6700\u8fd1\u7b2c\u4e00\u6b21\u5728\u5de5\u4f5c\u4e2d\u4f7f\u7528\u4e86\uff0c\u611f\u5230\u975e\u5e38\u5f00\u5fc3\uff0c\u6240\u4ee5\u4e3a\u4e86\u4ee5\u540e\u4e5f\u80fd\u591f\u4f7f\u7528\uff0c\u505a\u4e86\u4f7f\u7528\u793a\u4f8b [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010java\u3011\u53ef\u9009\u8bb0\u5f55\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-25T14:03:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-29T20:06:40+00:00\" \/>\n<meta name=\"author\" content=\"\u5b87, \u534e\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u5b87, \u534e\" \/>\n\t<meta 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