{"id":3641,"date":"2023-11-22T14:41:00","date_gmt":"2023-11-22T06:41:00","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=3641"},"modified":"2023-11-21T15:13:16","modified_gmt":"2023-11-21T07:13:16","slug":"apex-classes-and-casting","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3641","title":{"rendered":"Apex Classes and Casting"},"content":{"rendered":"\n<p>\u901a\u5e38\uff0c\u6240\u6709\u7c7b\u578b\u4fe1\u606f\u5728\u8fd0\u884c\u65f6\u90fd\u53ef\u7528\u3002\u8fd9\u610f\u5473\u7740 Apex \u542f\u7528<dfn>\u5f3a\u5236\u8f6c\u6362<\/dfn>\uff0c\u5373\u5c06\u4e00\u4e2a\u7c7b\u7684\u6570\u636e\u7c7b\u578b\u5206\u914d\u7ed9\u4e00\u4e2a\u6570\u636e \u53e6\u4e00\u4e2a\u7c7b\u7684\u7c7b\u578b\uff0c\u4f46\u4ec5\u5f53\u4e00\u4e2a\u7c7b\u662f\u53e6\u4e00\u4e2a\u7c7b\u7684\u5b50\u7c7b\u65f6\u3002\u4f7f\u7528\u94f8\u9020 \u5f53\u60a8\u8981\u5c06\u5bf9\u8c61\u4ece\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u53e6\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u65f6\u3002<\/p>\n\n\n\n<p>\u5728\u4ee5\u4e0b\u793a\u4f8b\u4e2d\uff0c\u6269\u5c55 \u7c7b .\u56e0\u6b64\uff0c\u5b83\u662f\u4e00\u4e2a\u5b50\u7c7b \u90a3\u4e2a\u73ed\u7ea7\u3002\u8fd9\u610f\u5473\u7740\u60a8\u53ef\u4ee5\u4f7f\u7528\u5f3a\u5236\u8f6c\u6362\u5c06\u5bf9\u8c61\u4e0e\u7236\u5bf9\u8c61\u4e00\u8d77\u5206\u914d \u6570\u636e\u7c7b\u578b \uff08\uff09 \u6dfb\u52a0\u5230\u5bf9\u8c61\u7684 \u5b50\u7c7b\u6570\u636e\u7c7b\u578b \uff08\uff09\u3002<samp>CustomReport<\/samp><samp>Report<\/samp><samp>Report<\/samp><samp>CustomReport<\/samp><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public virtual class Report {\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>public class CustomReport extends Report {\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u6bb5\u4e2d\uff0c\u9996\u5148\u5c06\u81ea\u5b9a\u4e49\u62a5\u8868\u5bf9\u8c61\u6dfb\u52a0\u5230\u62a5\u8868\u5217\u8868\u4e2d \u5bf9\u8c61\u3002\u7136\u540e\uff0c\u81ea\u5b9a\u4e49\u62a5\u8868\u5bf9\u8c61\u5c06\u4f5c\u4e3a\u62a5\u8868\u5bf9\u8c61\u8fd4\u56de\uff0c\u7136\u540e \u5f3a\u5236\u8f6c\u6362\u56de\u81ea\u5b9a\u4e49\u62a5\u8868\u5bf9\u8c61\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>...\n  \/\/ Create a list of report objects\n  Report&#91;] Reports = new Report&#91;5];\n\n  \/\/ Create a custom report object\n  CustomReport a = new CustomReport();\n\n  \/\/ Because the custom report is a sub class of the Report class,\n  \/\/ you can add the custom report object a to the list of report objects\n  Reports.add(a);\n\n  \/\/ The following is not legal:\n  \/\/ CustomReport c = Reports.get(0);\n  \/\/ because the compiler does not know that what you are\n  \/\/ returning is a custom report. \n\n  \/\/ You must use cast to tell it that you know what\n  \/\/ type you are returning. Instead, get the first item in the list\n  \/\/ by casting it back to a custom report object\n  CustomReport c = (CustomReport) Reports.get(0);\n...<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"400\" height=\"569\" src=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/Classes-and-Casting.jpg\" alt=\"\" class=\"wp-image-3645\" srcset=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/Classes-and-Casting.jpg 400w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/Classes-and-Casting-211x300.jpg 211w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p>\u6b64\u5916\uff0c\u63a5\u53e3\u7c7b\u578b\u53ef\u4ee5\u5f3a\u5236\u8f6c\u6362\u4e3a\u5b50\u63a5\u53e3\u6216\u7c7b\u7c7b\u578b\uff0c\u8be5\u7c7b\u7c7b\u578b \u5b9e\u73b0\u8be5\u63a5\u53e3\u3002<\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u82e5\u8981\u9a8c\u8bc1\u7c7b\u662f\u5426\u4e3a\u7279\u5b9a\u7c7b\u578b\u7684\u7c7b\uff0c\u8bf7\u4f7f\u7528\u5173\u952e\u5b57\u3002\u6709\u5173\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605<a href=\"https:\/\/developer.salesforce.com\/docs\/atlas.en-us.apexcode.meta\/apexcode\/apex_classes_keywords_instanceof.htm\">\u4f7f\u7528&nbsp;<samp>instanceof<\/samp>&nbsp;\u5173\u952e\u5b57<\/a>\u3002<samp>instanceOf<\/samp><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u7c7b\u548c\u96c6\u5408<\/h1>\n\n\n\n<p>\u5217\u8868\u548c\u6620\u5c04\u53ef\u4ee5\u4e0e\u7c7b\u548c\u63a5\u53e3\u4e00\u8d77\u4f7f\u7528\uff0c\u5176\u65b9\u5f0f\u4e0e\u5217\u8868\u548c\u6620\u5c04\u76f8\u540c \u4e0e sObject \u4e00\u8d77\u4f7f\u7528\u3002\u8fd9\u610f\u5473\u7740\uff0c\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u5c06\u7528\u6237\u5b9a\u4e49\u7684\u6570\u636e\u7c7b\u578b\u7528\u4e8e value \u6216\u6620\u5c04\u7684\u952e\u3002\u540c\u6837\uff0c\u60a8\u53ef\u4ee5\u521b\u5efa\u4e00\u7ec4\u7528\u6237\u5b9a\u4e49\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u521b\u5efa\u6620\u5c04\u6216\u63a5\u53e3\u5217\u8868\uff0c\u5219 \u63a5\u53e3\u53ef\u4ee5\u653e\u5165\u8be5\u96c6\u5408\u4e2d\u3002\u4f8b\u5982\uff0c\u5982\u679c List \u5305\u542b\u4e00\u4e2a\u63a5\u53e3\uff0c\u5e76\u5b9e\u73b0 \uff0c\u7136\u540e\u53ef\u4ee5 \u88ab\u653e\u7f6e\u5728\u5217\u8868\u4e2d\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Collection Casting<\/h1>\n\n\n\n<p>\u7531\u4e8e Apex \u4e2d\u7684\u96c6\u5408\u5728\u8fd0\u884c\u65f6\u5177\u6709\u58f0\u660e\u7684\u7c7b\u578b\uff0c\u56e0\u6b64 Apex \u5141\u8bb8\u96c6\u5408\u8f6c\u6362\u3002<\/p>\n\n\n\n<p>\u96c6\u5408\u53ef\u4ee5\u91c7\u7528\u4e0e\u6570\u7ec4\u7c7b\u4f3c\u7684\u65b9\u5f0f\u8fdb\u884c\u5f3a\u5236\u8f6c\u6362 \u5728 Java \u4e2d\u6295\u5c04\u3002\u4f8b\u5982\uff0cCustomerPurchaseOrder \u5bf9\u8c61\u7684\u5217\u8868 \u5982\u679c class \u662f\u5b50\u5bf9\u8c61\uff0c\u5219\u53ef\u4ee5\u5206\u914d\u7ed9 PurchaseOrder \u5bf9\u8c61\u5217\u8868 \u7684\u7c7b\u3002<samp>CustomerPurchaseOrder<\/samp><samp>PurchaseOrder<\/samp><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public virtual class PurchaseOrder {\n\n    Public class CustomerPurchaseOrder extends PurchaseOrder {\n\n    }\n    {\n        List&lt;PurchaseOrder&gt; POs = new PurchaseOrder&#91;] {};\n        List&lt;CustomerPurchaseOrder&gt; CPOs = new CustomerPurchaseOrder&#91;]{};\n        POs = CPOs;\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5c06\u5217\u8868\u5206\u914d\u7ed9\u5217\u8868\u53d8\u91cf\u540e\uff0c\u5c31\u53ef\u4ee5\u5c06\u5176\u5f3a\u5236\u8f6c\u6362 \u8fd4\u56de\u5230 CustomerPurchaseOrder \u5bf9\u8c61\u7684\u5217\u8868\uff0c\u4f46\u53ea\u662f\u56e0\u4e3a\u8be5\u5b9e\u4f8b\u662f \u6700\u521d\u5b9e\u4f8b\u5316\u4e3a CustomerPurchaseOrder \u5bf9\u8c61\u7684\u5217\u8868\u3002\u5217\u8868 \u5b9e\u4f8b\u5316\u7684 PurchaseOrder \u5bf9\u8c61\u4e0d\u80fd\u5f3a\u5236\u8f6c\u6362\u4e3a CustomerPurchaseOrder \u5bf9\u8c61\uff0c\u5373\u4f7f PurchaseOrder \u5bf9\u8c61\u5217\u8868\u4ec5\u5305\u542b CustomerPurchaseOrder \u5bf9\u8c61\u3002<samp>CustomerPurchaseOrder<\/samp><samp>PurchaseOrder<\/samp><\/p>\n\n\n\n<p>\u5982\u679c\u4ec5\u5305\u542b CustomerPurchaseOrders \u7684 PurchaseOrder \u5217\u8868\u7684\u7528\u6237 objects \u5c1d\u8bd5\u63d2\u5165 \u7684\u975e CustomerPurchaseOrder \u5b50\u7c7b\uff08\u4f8b\u5982 \uff09\uff0c\u8fd0\u884c\u65f6 \u5f02\u5e38\u7ed3\u679c\u3002\u8fd9\u662f\u56e0\u4e3a Apex \u96c6\u5408\u5728\u8fd0\u884c\u65f6\u5177\u6709\u58f0\u660e\u7684\u7c7b\u578b\u3002<samp>PurchaseOrder<\/samp><samp>InternalPurchaseOrder<\/samp><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5730\u56fe\u7684\u884c\u4e3a\u65b9\u5f0f\u4e0e\u5217\u8868\u5728\u5730\u56fe\u7684\u503c\u65b9\u9762\u76f8\u540c\u3002\u5982\u679c\u503c \u6620\u5c04 A \u7684\u4e00\u4fa7\u53ef\u4ee5\u5f3a\u5236\u8f6c\u6362\u4e3a\u6620\u5c04 B \u7684\u503c\u4fa7\uff0c\u5e76\u4e14\u5b83\u4eec\u5177\u6709\u76f8\u540c\u7684\u952e\u7c7b\u578b\uff0c \u7136\u540e\u53ef\u4ee5\u5c06\u6620\u5c04 A \u6295\u5c04\u5230\u6620\u5c04 B\u3002\u5982\u679c\u5f3a\u5236\u8f6c\u6362\u65e0\u6548\uff0c\u5219\u4f1a\u5bfc\u81f4\u8fd0\u884c\u65f6\u9519\u8bef \u5728\u8fd0\u884c\u65f6\u4f7f\u7528\u7279\u5b9a\u6620\u5c04\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u5e38\uff0c\u6240\u6709\u7c7b\u578b\u4fe1\u606f\u5728\u8fd0\u884c\u65f6\u90fd\u53ef\u7528\u3002\u8fd9\u610f\u5473\u7740 Apex \u542f\u7528\u5f3a\u5236\u8f6c\u6362\uff0c\u5373\u5c06\u4e00\u4e2a\u7c7b\u7684\u6570\u636e\u7c7b\u578b\u5206\u914d\u7ed9\u4e00\u4e2a\u6570\u636e \u53e6\u4e00\u4e2a &hellip; <a href=\"http:\/\/www.ponybai.com\/?p=3641\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">Apex Classes and Casting<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":3644,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[199],"tags":[],"class_list":["post-3641","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-apex-"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Apex Classes and Casting - \u767d\u767d\u968f\u7b14<\/title>\n<meta name=\"description\" content=\"\u901a\u5e38\uff0c\u6240\u6709\u7c7b\u578b\u4fe1\u606f\u5728\u8fd0\u884c\u65f6\u90fd\u53ef\u7528\u3002\u8fd9\u610f\u5473\u7740 Apex \u542f\u7528\u5f3a\u5236\u8f6c\u6362\uff0c\u5373\u5c06\u4e00\u4e2a\u7c7b\u7684\u6570\u636e\u7c7b\u578b\u5206\u914d\u7ed9\u4e00\u4e2a\u6570\u636e 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