{"id":616,"date":"2023-11-19T02:12:24","date_gmt":"2022-10-23T23:11:46","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/kotlin-%e5%af%86%e5%b0%81%e7%b1%bb\/"},"modified":"2025-08-02T22:55:02","modified_gmt":"2025-08-02T14:55:02","slug":"kotlin-%e5%af%86%e5%b0%81%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/kotlin-%e5%af%86%e5%b0%81%e7%b1%bb\/","title":{"rendered":"\u5168\u9762\u7406\u89e3Kotlin\u5bc6\u5c01\u7c7b\uff1a\u6982\u5ff5\u3001\u5e94\u7528\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdKotlin\u5bc6\u5c01\u7c7b\u3002\u4ec0\u4e48\u662f\u5bc6\u5c01\u7c7b\uff1f\u5b83\u4eec\u6709\u4ec0\u4e48\u7528\u9014\uff1f\u6211\u4eec\u5c06\u5728\u4e0b\u6587\u4e2d\u4e00\u4e00\u89e3\u7b54\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n<h2>Kotlin \u5bc6\u5c01\u7c7b<\/h2>\n<div class=\"image-container\">\n    <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647b20a4b2f92e6c72c02d\/2-0.png\" class=\"post-images\" alt=\"kotlin sealed class\" title=\"Kotlin\u5bc6\u5c01\u7c7b\u793a\u4f8b\">\n<\/div>\n<h3>\u5b9e\u73b0 Kotlin \u5bc6\u5c01\u7c7b<\/h3>\n<p>Kotlin\u4e2d\u7684\u5bc6\u5c01\u7c7b\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code>sealed class A{\r\n    class B : A()\r\n    class C : A()\r\n}\r\n<\/code><\/pre>\n<p>\u8981\u6307\u5b9a\u4e00\u4e2a\u5bc6\u5c01\u7c7b\uff0c\u9700\u8981\u6dfb\u52a0sealed\u4fee\u9970\u7b26\u3002\u5bc6\u5c01\u7c7b\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\uff0c\u56e0\u6b64\u5b83\u4eec\u662f\u9690\u5f0f\u62bd\u8c61\u7c7b\u3002\u4ee5\u4e0b\u65b9\u6cd5\u4e0d\u53ef\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code>fun main(args: Array&lt;String&gt;) \r\n{\r\n    var a = A() \/\/\u7f16\u8bd1\u9519\u8bef\u3002\u7c7bA\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\u3002\r\n}\r\n<\/code><\/pre>\n<p>\u5bc6\u5c01\u7c7b\u7684\u6784\u9020\u51fd\u6570\u9ed8\u8ba4\u4e3a\u79c1\u6709\u3002\u5bc6\u5c01\u7c7b\u7684\u6240\u6709\u5b50\u7c7b\u5fc5\u987b\u5728\u540c\u4e00\u6587\u4ef6\u4e2d\u58f0\u660e\u3002\u5bc6\u5c01\u7c7b\u5bf9\u7f16\u8bd1\u65f6\u7684\u7c7b\u578b\u5b89\u5168\u975e\u5e38\u91cd\u8981\uff0c\u901a\u8fc7\u9650\u5236\u7c7b\u578b\u96c6\u5408\u6765\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code>sealed class A{\r\n    class B : A() \r\n    {\r\n        class E : A() \/\/\u8fd9\u6837\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u3002\r\n    }\r\n    class C : A()\r\n\r\n    init {\r\n        println(\"sealed class A\")\r\n    }\r\n\r\n}\r\n\r\nclass D : A() \/\/\u8fd9\u6837\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\r\n{\r\n    class F: A() \/\/\u8fd9\u6837\u4e0d\u884c\u3002\u56e0\u4e3a\u5bc6\u5c01\u7c7b\u5b9a\u4e49\u5728\u53e6\u4e00\u4e2a\u4f5c\u7528\u57df\u4e2d\u3002\r\n}\r\n<\/code><\/pre>\n<p>\u4f7f\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u5bc6\u5c01\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code>sealed class A(var name: String){\r\n    class B : A(\"B\")\r\n    class C : A(\"C\")\r\n}\r\n\r\nclass D : A(\"D\")\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>fun main(args: Array&lt;String&gt;) {\r\n    \r\n    var b = A.B()\r\n    var d = D()\r\n}\r\n<\/code><\/pre>\n<p>\u5728\u4e00\u4e2a\u5bc6\u5c01\u7c7b\u4e2d\u6dfb\u52a0\u6570\u636e\u7c7b\u548c\u5bf9\u8c61\u3002<\/p>\n<pre class=\"post-pre\"><code>fun main(args: Array&lt;String&gt;) {\r\n\r\n    val e = A.E(\"Anupam\")\r\n    println(e) \/\/\u8f93\u51fa E(name=Anupam)\r\n\r\n    var d = A.D\r\n    d.name() \/\/\u8f93\u51fa Object D\r\n}\r\n\r\n\r\nsealed class A{\r\n    class B : A()\r\n    class C : A()\r\n    object D : A()\r\n    {\r\n         fun name()\r\n         {\r\n             println(\"Object D\")\r\n         }\r\n    }\r\n    data class E(var name: String) : A()\r\n\r\n}\r\n<\/code><\/pre>\n<h3>\u679a\u4e3e\u548c\u5bc6\u5c01\u7c7b\u4e4b\u95f4\u7684\u533a\u522b<\/h3>\n<p>\u5728 Kotlin \u4e2d\uff0c\u5bc6\u5c01\u7c7b\u53ef\u4ee5\u88ab\u89c6\u4e3a\u589e\u5f3a\u7248\u7684\u679a\u4e3e\u7c7b\u3002\u5bc6\u5c01\u7c7b\u5141\u8bb8\u6211\u4eec\u521b\u5efa\u5177\u6709\u4e0d\u540c\u7c7b\u578b\u7684\u5b9e\u4f8b\uff0c\u800c\u679a\u4e3e\u7c7b\u53ea\u5141\u8bb8\u6211\u4eec\u4e3a\u6240\u6709\u679a\u4e3e\u5e38\u91cf\u4f7f\u7528\u76f8\u540c\u7c7b\u578b\u3002\u5728\u679a\u4e3e\u7c7b\u4e2d\u65e0\u6cd5\u5b9e\u73b0\u4ee5\u4e0b\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code>enum class Months(string: String){\r\n    January(\"Jan\"), February(2),\r\n}\r\n<\/code><\/pre>\n<p>\u5bc6\u5c01\u7c7b\uff08sealed classes\uff09\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u591a\u4e2a\u5b9e\u4f8b\uff0c\u4ece\u800c\u5141\u8bb8\u6240\u6709\u5e38\u91cf\u4f7f\u7528\u540c\u4e00\u7c7b\u578b\u3002<\/p>\n<pre class=\"post-pre\"><code>sealed class Months {\r\n    class January(var shortHand: String) : Months()\r\n    class February(var number: Int) : Months()\r\n    class March(var shortHand: String, var number: Int) : Months()\r\n}\r\n<\/code><\/pre>\n<p>\u5728\u4f60\u7684\u9879\u76ee\u4e2d\uff0c\u5982\u4f55\u4f7f\u7528\u5bc6\u5c01\u7c7b\u7684\u8fd9\u4e00\u7279\u6027\uff1f\u5728\u7c7b\u4f3c\u65b0\u95fb\u63a8\u9001\u7684\u5e94\u7528\u4e2d\uff0c\u4f60\u53ef\u4ee5\u5982\u4e0b\u6240\u793a\u521b\u5efa\u4e09\u79cd\u4e0d\u540c\u7684\u7c7b\u7c7b\u578b\uff0c\u5305\u62ec\u72b6\u6001\uff08Status\uff09\u3001\u56fe\u7247\uff08Image\uff09\u548c\u89c6\u9891\uff08Video\uff09\u5e16\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code>sealed class Post\r\n{\r\n    class Status(var text: String) : Post()\r\n    class Image(var url: String, var caption: String) : Post()\r\n    class Video(var url: String, var timeDuration: Int, var encoding: String): Post()\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u5728\u679a\u4e3e\u7c7b\u4e2d\u662f\u65e0\u6cd5\u5b9e\u73b0\u7684\u3002<\/p>\n<h3>\u5bc6\u5c01\u7c7b\u548cwhen\u8bed\u53e5<\/h3>\n<p>\u5bc6\u5c01\u7c7b\u901a\u5e38\u4e0ewhen\u8bed\u53e5\u4e00\u8d77\u4f7f\u7528\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u5b50\u7c7b\u53ca\u5176\u7c7b\u578b\u90fd\u5145\u5f53\u4e00\u4e2a\u6761\u4ef6\u5206\u652f\u3002\u6b64\u5916\uff0c\u5bc6\u5c01\u7c7b\u9650\u5236\u4e86\u7c7b\u578b\u96c6\u5408\u3002\u56e0\u6b64\uff0cwhen\u8bed\u53e5\u7684else\u90e8\u5206\u53ef\u4ee5\u7701\u7565\u3002\u4e0b\u9762\u7684\u4f8b\u5b50\u6f14\u793a\u4e86\u8fd9\u4e00\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code>sealed class Shape{\r\n    class Circle(var radius: Float): Shape()\r\n    class Square(var length: Int): Shape()\r\n    class Rectangle(var length: Int, var breadth: Int): Shape()\r\n}\r\n\r\nfun eval(e: Shape) =\r\n        when (e) {\r\n            is Shape.Circle -&gt; println(\"Circle area is ${3.14*e.radius*e.radius}\")\r\n            is Shape.Square -&gt; println(\"Square area is ${e.length*e.length}\")\r\n            is Shape.Rectangle -&gt; println(\"Rectagle area is ${e.length*e.breadth}\")\r\n        }\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5728\u4e3b\u51fd\u6570\u4e2d\u6267\u884c\u5982\u4e0b\u6240\u793a\u7684eval\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>fun main(args: Array&lt;String&gt;) {\r\n\r\n    var circle = Shape.Circle(4.5f)\r\n    var square = Shape.Square(4)\r\n    var rectangle = Shape.Rectangle(4,5)\r\n\r\n    eval(circle)\r\n    eval(square)\r\n    eval(rectangle)\r\n    \/\/eval(x) \/\/\u7f16\u8bd1\u65f6\u9519\u8bef\u3002\r\n\r\n}\r\n\r\n\/\/\u63a7\u5236\u53f0\u8f93\u51fa\u5982\u4e0b\uff1a\r\n\/\/Circle area is 63.585\r\n\/\/Square area is 16\r\n\/\/Rectangle area is 20\r\n<\/code><\/pre>\n<p>\u6ce8\u610f\uff1ais\u4fee\u9970\u7b26\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u7c7b\u662f\u5426\u4e3a\u7279\u5b9a\u7c7b\u578b\u3002is\u4fee\u9970\u7b26\u4ec5\u9002\u7528\u4e8e\u7c7b\uff0c\u800c\u4e0d\u9002\u7528\u4e8eKotlin\u5bf9\u8c61\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>sealed class Shape{\r\n    class Circle(var radius: Float): Shape()\r\n    class Square(var length: Int): Shape()\r\n    object Rectangle: Shape()\r\n    {\r\n        var length: Int = 0\r\n        var breadth : Int = 0\r\n    }\r\n}\r\n\r\nfun eval(e: Shape) =\r\n        when (e) {\r\n            is Shape.Circle -&gt; println(\"Circle area is ${3.14*e.radius*e.radius}\")\r\n            is Shape.Square -&gt; println(\"Square area is ${e.length*e.length}\")\r\n            Shape.Rectangle -&gt; println(\"Rectangle area is ${Shape.Rectangle.length*Shape.Rectangle.breadth}\")\r\n        }\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u5185\u5bb9\u5c31\u662fKotlin\u5bc6\u5c01\u7c7b\u6559\u7a0b\u7684\u5168\u90e8\u5185\u5bb9\u3002\u53c2\u8003\u8d44\u6599\uff1aKotlin\u5b98\u65b9\u6587\u6863<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdKotlin\u5bc6\u5c01\u7c7b\u3002\u4ec0\u4e48\u662f\u5bc6\u5c01\u7c7b\uff1f\u5b83\u4eec\u6709\u4ec0\u4e48\u7528\u9014\uff1f\u6211\u4eec\u5c06\u5728\u4e0b\u6587\u4e2d\u4e00\u4e00\u89e3\u7b54\u8fd9\u4e9b\u95ee\u9898\u3002  [&hellip;]<\/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":[897,1748,1747],"class_list":{"0":"post-616","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-kotlin","9":"tag-1747"},"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>\u5168\u9762\u7406\u89e3Kotlin\u5bc6\u5c01\u7c7b\uff1a\u6982\u5ff5\u3001\u5e94\u7528\u4e0e\u6700\u4f73\u5b9e\u8df5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u672c\u6587\u5168\u9762\u89e3\u6790Kotlin\u5bc6\u5c01\u7c7b\u7684\u6982\u5ff5\u3001\u8bed\u6cd5\u548c\u5e94\u7528\u573a\u666f\u3002\u901a\u8fc7\u5b9e\u4f8b\u4ee3\u7801\u548c\u6700\u4f73\u5b9e\u8df5\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u6df1\u5165\u7406\u89e3\u8fd9\u4e00\u5f3a\u5927\u7684\u7c7b\u578b\u7cfb\u7edf\u7279\u6027\uff0c\u63d0\u5347Kotlin\u7f16\u7a0b\u6280\u80fd\u3002\u9002\u5408\u6709\u4e00\u5b9aKotlin\u57fa\u7840\u7684\u5f00\u53d1\u8005\u9605\u8bfb\u3002\" \/>\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\/kotlin-\u5bc6\u5c01\u7c7b\/\" \/>\n<meta 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content=\"2022-10-23T23:11:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-02T14:55:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647b20a4b2f92e6c72c02d\/2-0.png\" \/>\n<meta name=\"author\" content=\"\u6e05, \u5b87\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u6e05, \u5b87\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" 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