{"id":175,"date":"2023-03-02T17:21:19","date_gmt":"2023-03-17T08:29:52","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%b8%ad%e7%9a%84%e8%ae%bf%e9%97%ae%e8%80%85%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f\/"},"modified":"2025-08-01T01:53:47","modified_gmt":"2025-07-31T17:53:47","slug":"java%e4%b8%ad%e7%9a%84%e8%ae%bf%e9%97%ae%e8%80%85%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84%e8%ae%bf%e9%97%ae%e8%80%85%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f\/","title":{"rendered":"Java\u8bbe\u8ba1\u6a21\u5f0f\uff1a\u6df1\u5165\u7406\u89e3\u8bbf\u95ee\u8005\u6a21\u5f0f\u53ca\u5176\u5e94\u7528"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u4e2d\u7684\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002<\/p>\n<p>\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u662f\u884c\u4e3a\u578b\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\u3002<\/p>\n<h2>\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u8be6\u89e3<\/h2>\n<p>\u5f53\u6211\u4eec\u9700\u8981\u5bf9\u4e00\u7ec4\u76f8\u4f3c\u7c7b\u578b\u7684\u5bf9\u8c61\u6267\u884c\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u8bbf\u95ee\u8005\u6a21\u5f0f\u3002\u501f\u52a9\u8bbf\u95ee\u8005\u6a21\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u64cd\u4f5c\u903b\u8f91\u4ece\u5bf9\u8c61\u672c\u8eab\u8f6c\u79fb\u5230\u53e6\u4e00\u4e2a\u72ec\u7acb\u7684\u7c7b\u4e2d\u3002\u4f8b\u5982\uff0c\u60f3\u8c61\u4e00\u4e2a\u8d2d\u7269\u8f66\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u4e0d\u540c\u7c7b\u578b\u7684\u5546\u54c1\uff08\u5143\u7d20\uff09\u3002\u5f53\u6211\u4eec\u70b9\u51fb\u7ed3\u7b97\u6309\u94ae\u65f6\uff0c\u5b83\u4f1a\u8ba1\u7b97\u9700\u8981\u652f\u4ed8\u7684\u603b\u91d1\u989d\u3002\u6b64\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u9009\u62e9\u5c06\u8ba1\u7b97\u903b\u8f91\u653e\u5728\u6bcf\u4e2a\u5546\u54c1\u7c7b\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u5229\u7528\u8bbf\u95ee\u8005\u6a21\u5f0f\u5c06\u6b64\u903b\u8f91\u8f6c\u79fb\u5230\u4e00\u4e2a\u72ec\u7acb\u7684\u8ba1\u7b97\u7c7b\u4e2d\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u901a\u8fc7\u4e00\u4e2a\u5177\u4f53\u7684\u793a\u4f8b\u6765\u6f14\u793a\u5982\u4f55\u5728Java\u4e2d\u5b9e\u73b0\u8fd9\u4e00\u529f\u80fd\u3002<\/p>\n<h3>\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u7684Java\u793a\u4f8b<\/h3>\n<p>\u4e3a\u4e86\u5b9e\u73b0\u8bbf\u95ee\u8005\u6a21\u5f0f\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u521b\u5efa\u4e0d\u540c\u7c7b\u578b\u7684\u5546\u54c1\uff08\u5143\u7d20\uff09\uff0c\u4ee5\u4fbf\u5728\u8d2d\u7269\u8f66\u4e2d\u4f7f\u7528\u3002\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53e3 `ItemElement.java`\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.design.visitor;\r\n\r\npublic interface ItemElement {\r\n\r\n\tpublic int accept(ShoppingCartVisitor visitor);\r\n}\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c`accept` \u65b9\u6cd5\u9700\u8981\u4e00\u4e2a `Visitor` \u53c2\u6570\u3002\u4e3a\u4e86\u7b80\u5316\u793a\u4f8b\uff0c\u6211\u4eec\u53ea\u5173\u6ce8\u8bbf\u95ee\u8005\u6a21\u5f0f\u7684\u6838\u5fc3\u6982\u5ff5\uff0c\u56e0\u6b64\u6ca1\u6709\u6dfb\u52a0\u5176\u4ed6\u4e0e\u5546\u54c1\u76f8\u5173\u7684\u7279\u5b9a\u65b9\u6cd5\u3002\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u4e3a\u4e0d\u540c\u7c7b\u578b\u7684\u5546\u54c1\u521b\u5efa\u5177\u4f53\u7684\u5b9e\u73b0\u7c7b\u3002\u4f8b\u5982\uff0c`Book.java`\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.design.visitor;\r\n\r\npublic class Book implements ItemElement {\r\n\r\n\tprivate int price;\r\n\tprivate String isbnNumber;\r\n\t\r\n\tpublic Book(int cost, String isbn){\r\n\t\tthis.price=cost;\r\n\t\tthis.isbnNumber=isbn;\r\n\t}\r\n\t\r\n\tpublic int getPrice() {\r\n\t\treturn price;\r\n\t}\r\n\r\n\tpublic String getIsbnNumber() {\r\n\t\treturn isbnNumber;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic int accept(ShoppingCartVisitor visitor) {\r\n\t\treturn visitor.visit(this);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u53ca `Fruit.java`\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.design.visitor;\r\n\r\npublic class Fruit implements ItemElement {\r\n\t\r\n\tprivate int pricePerKg;\r\n\tprivate int weight;\r\n\tprivate String name;\r\n\t\r\n\tpublic Fruit(int priceKg, int wt, String nm){\r\n\t\tthis.pricePerKg=priceKg;\r\n\t\tthis.weight=wt;\r\n\t\tthis.name = nm;\r\n\t}\r\n\t\r\n\tpublic int getPricePerKg() {\r\n\t\treturn pricePerKg;\r\n\t}\r\n\r\n\r\n\tpublic int getWeight() {\r\n\t\treturn weight;\r\n\t}\r\n\r\n\tpublic String getName(){\r\n\t\treturn this.name;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic int accept(ShoppingCartVisitor visitor) {\r\n\t\treturn visitor.visit(this);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u5728\u5177\u4f53\u7684\u5546\u54c1\u7c7b\u4e2d\uff0c`accept()` \u65b9\u6cd5\u7684\u5b9e\u73b0\u90fd\u8c03\u7528\u4e86 `Visitor` \u7684 `visit()` \u65b9\u6cd5\uff0c\u5e76\u5c06\u81ea\u8eab\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5b9a\u4e49 `Visitor` \u63a5\u53e3\uff0c\u5176\u4e2d\u5305\u542b\u9488\u5bf9\u4e0d\u540c\u7c7b\u578b\u5546\u54c1\u5b9a\u4e49\u7684 `visit()` \u65b9\u6cd5\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u5c06\u7531\u5177\u4f53\u7684\u8bbf\u95ee\u8005\u7c7b\u6765\u5b9e\u73b0\u3002\u5b9a\u4e49 `ShoppingCartVisitor.java`\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.design.visitor;\r\n\r\npublic interface ShoppingCartVisitor {\r\n\r\n\tint visit(Book book);\r\n\tint visit(Fruit fruit);\r\n}\r\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u5c06\u5b9e\u73b0 `Visitor` \u63a5\u53e3\uff0c\u5e76\u4e3a\u6bcf\u79cd\u5546\u54c1\u7f16\u5199\u5176\u7279\u5b9a\u7684\u6210\u672c\u8ba1\u7b97\u903b\u8f91\u3002\u5728 `ShoppingCartVisitorImpl.java` \u6587\u4ef6\u4e2d\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.design.visitor;\r\n\r\npublic class ShoppingCartVisitorImpl implements ShoppingCartVisitor {\r\n\r\n\t@Override\r\n\tpublic int visit(Book book) {\r\n\t\tint cost=0;\r\n\t\t\/\/ \u5982\u679c\u56fe\u4e66\u4ef7\u683c\u5927\u4e8e50\uff0c\u5219\u4f18\u60e05\u7f8e\u5143\r\n\t\tif(book.getPrice() &gt; 50){\r\n\t\t\tcost = book.getPrice()-5;\r\n\t\t}else cost = book.getPrice();\r\n\t\tSystem.out.println(\"\u56fe\u4e66ISBN::\"+book.getIsbnNumber() + \" \u4ef7\u683c =\"+cost);\r\n\t\treturn cost;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic int visit(Fruit fruit) {\r\n\t\tint cost = fruit.getPricePerKg()*fruit.getWeight();\r\n\t\tSystem.out.println(fruit.getName() + \" \u4ef7\u683c = \"+cost);\r\n\t\treturn cost;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u5728\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u8fd9\u4e2a\u8bbf\u95ee\u8005\u6a21\u5f0f\u793a\u4f8b\u3002\u901a\u8fc7 `ShoppingCartClient.java` \u6765\u5b9e\u73b0\uff1a<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.design.visitor;\r\n\r\npublic class ShoppingCartClient {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tItemElement[] items = new ItemElement[]{new Book(20, \"1234\"),new Book(100, \"5678\"),\r\n\t\t\t\tnew Fruit(10, 2, \"Banana\"), new Fruit(5, 5, \"Apple\")};\r\n\t\t\r\n\t\tint total = calculatePrice(items);\r\n\t\tSystem.out.println(\"\u603b\u6210\u672c = \"+total);\r\n\t}\r\n\r\n\tprivate static int calculatePrice(ItemElement[] items) {\r\n\t\tShoppingCartVisitor visitor = new ShoppingCartVisitorImpl();\r\n\t\tint sum=0;\r\n\t\tfor(ItemElement item : items){\r\n\t\t\tsum = sum + item.accept(visitor);\r\n\t\t}\r\n\t\treturn sum;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u8bbf\u95ee\u8005\u6a21\u5f0f\u5ba2\u6237\u7aef\u7a0b\u5e8f\u65f6\uff0c\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>\u56fe\u4e66ISBN::1234 \u4ef7\u683c =20\r\n\u56fe\u4e66ISBN::5678 \u4ef7\u683c =95\r\n\u9999\u8549 \u4ef7\u683c = 20\r\n\u82f9\u679c \u4ef7\u683c = 25\r\n\u603b\u6210\u672c = 160\r\n<\/code><\/pre>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u6240\u6709\u5546\u54c1\u4e2d\u7684 `accept()` \u65b9\u6cd5\u5b9e\u73b0\u662f\u76f8\u540c\u7684\uff0c\u4f46\u5b83\u4e5f\u53ef\u4ee5\u6709\u6240\u4e0d\u540c\uff0c\u4f8b\u5982\u53ef\u4ee5\u52a0\u5165\u903b\u8f91\u6765\u68c0\u67e5\u5982\u679c\u5546\u54c1\u662f\u514d\u8d39\u7684\uff0c\u5219\u6839\u672c\u4e0d\u8c03\u7528 `visit()` \u65b9\u6cd5\u3002<\/p>\n<h3>\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u7c7b\u56fe<\/h3>\n<p>\u6211\u4eec\u7684\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u5b9e\u73b0\u7684\u7c7b\u56fe\u5982\u4e0b\uff1a<\/p>\n<p>[\u6b64\u5904\u5e94\u63d2\u5165\u7c7b\u56fe\u56fe\u7247]<\/p>\n<h3>\u8bbf\u95ee\u8005\u6a21\u5f0f\u7684\u4f18\u70b9<\/h3>\n<p>\u8fd9\u79cd\u6a21\u5f0f\u7684\u4f18\u70b9\u5728\u4e8e\uff0c\u5982\u679c\u64cd\u4f5c\u7684\u903b\u8f91\u53d1\u751f\u53d8\u5316\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728\u8bbf\u95ee\u8005\u5b9e\u73b0\u4e2d\u8fdb\u884c\u4fee\u6539\uff0c\u800c\u65e0\u9700\u4fee\u6539\u6240\u6709\u5546\u54c1\u7c7b\u3002\u53e6\u4e00\u4e2a\u4f18\u70b9\u662f\uff0c\u5411\u7cfb\u7edf\u4e2d\u6dfb\u52a0\u65b0\u7684\u5546\u54c1\u975e\u5e38\u5bb9\u6613\uff0c\u53ea\u9700\u8981\u5728\u8bbf\u95ee\u8005\u63a5\u53e3\u548c\u5b9e\u73b0\u4e2d\u8fdb\u884c\u4fee\u6539\uff0c\u73b0\u6709\u7684\u5546\u54c1\u7c7b\u4e0d\u4f1a\u53d7\u5230\u5f71\u54cd\u3002<\/p>\n<h3>\u8bbf\u95ee\u8005\u6a21\u5f0f\u7684\u5c40\u9650\u6027<\/h3>\n<p>\u8bbf\u95ee\u8005\u6a21\u5f0f\u7684\u7f3a\u70b9\u662f\uff0c\u6211\u4eec\u5728\u8bbe\u8ba1\u65f6\u9700\u8981\u77e5\u9053 `visit()` \u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b\uff0c\u5426\u5219\u6211\u4eec\u5c06\u4e0d\u5f97\u4e0d\u66f4\u6539\u63a5\u53e3\u53ca\u5176\u6240\u6709\u5b9e\u73b0\u3002\u53e6\u4e00\u4e2a\u7f3a\u70b9\u662f\uff0c\u5982\u679c\u8bbf\u95ee\u8005\u63a5\u53e3\u6709\u592a\u591a\u5b9e\u73b0\uff0c\u6269\u5c55\u5c06\u53d8\u5f97\u56f0\u96be\u3002\u5173\u4e8e\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5185\u5bb9\u5c31\u8fd9\u4e9b\uff0c\u5982\u679c\u6211\u9057\u6f0f\u4e86\u4ec0\u4e48\uff0c\u8bf7\u544a\u8bc9\u6211\u3002\u5982\u679c\u60a8\u559c\u6b22\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf7\u4e0e\u4ed6\u4eba\u5206\u4eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJava\u4e2d\u7684\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002 \u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u662f\u884c\u4e3a\u578b\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\u3002 \u8bbf\u95ee\u8005\u8bbe [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[189,720,721,486,722],"class_list":["post-175","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java","tag-720","tag-721","tag-486","tag-722"],"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>Java\u8bbe\u8ba1\u6a21\u5f0f\uff1a\u6df1\u5165\u7406\u89e3\u8bbf\u95ee\u8005\u6a21\u5f0f\u53ca\u5176\u5e94\u7528 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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