{"id":26407,"date":"2024-03-16T06:37:37","date_gmt":"2024-03-16T06:37:37","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/"},"modified":"2024-03-22T08:30:37","modified_gmt":"2024-03-22T08:30:37","slug":"how-does-a-subclass-in-scala-assign-values-to-its-parent-class","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/","title":{"rendered":"How does a subclass in Scala assign values to its parent class?"},"content":{"rendered":"<p>In Scala, the method for subclasses to assign values to the superclass is by calling the parent class&#8217;s constructor. When defining its own constructor, a subclass can use the &#8216;super&#8217; keyword to call the parent class&#8217;s constructor and pass the necessary parameters.<\/p>\n<p>For example, let&#8217;s say we have a parent class called Person and a child class called Student, you can assign values to the parent class like this:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Person<\/span>(<span class=\"hljs-params\">name: <span class=\"hljs-type\">String<\/span>, age: <span class=\"hljs-type\">Int<\/span><\/span>) <\/span>{\r\n  <span class=\"hljs-comment\">\/\/ \u7236\u7c7b\u7684\u6784\u9020\u51fd\u6570<\/span>\r\n}\r\n\r\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Student<\/span>(<span class=\"hljs-params\">name: <span class=\"hljs-type\">String<\/span>, age: <span class=\"hljs-type\">Int<\/span>, school: <span class=\"hljs-type\">String<\/span><\/span>) <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title\">Person<\/span>(<span class=\"hljs-params\">name, age<\/span>) <\/span>{\r\n  <span class=\"hljs-comment\">\/\/ \u5b50\u7c7b\u7684\u6784\u9020\u51fd\u6570<\/span>\r\n}\r\n<\/code><\/pre>\n<p>In the given example, the subclass Student invokes the constructor of the parent class Person for assignment. When instantiating a subclass object, the parent class constructor is first called to initialize the parent class properties, followed by initializing the subclass properties.<\/p>\n<p>It should be noted that if the parent class does not have a default constructor with no parameters, the subclass needs to provide the necessary parameters when calling the parent class&#8217;s constructor.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Scala, the method for subclasses to assign values to the superclass is by calling the parent class&#8217;s constructor. When defining its own constructor, a subclass can use the &#8216;super&#8217; keyword to call the parent class&#8217;s constructor and pass the necessary parameters. For example, let&#8217;s say we have a parent class called Person and a [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26407","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>How does a subclass in Scala assign values to its parent class? - 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\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How does a subclass in Scala assign values to its parent class?\" \/>\n<meta property=\"og:description\" content=\"In Scala, the method for subclasses to assign values to the superclass is by calling the parent class&#8217;s constructor. When defining its own constructor, a subclass can use the &#8216;super&#8217; keyword to call the parent class&#8217;s constructor and pass the necessary parameters. For example, let&#8217;s say we have a parent class called Person and a [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T06:37:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T08:30:37+00:00\" \/>\n<meta name=\"author\" content=\"Noah Thompson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Noah Thompson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/\"},\"author\":{\"name\":\"Noah Thompson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/2e83cc6ab9f60d36921c2d0f9f280f4a\"},\"headline\":\"How does a subclass in Scala assign values to its parent class?\",\"datePublished\":\"2024-03-16T06:37:37+00:00\",\"dateModified\":\"2024-03-22T08:30:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/\"},\"wordCount\":158,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-does-a-subclass-in-scala-assign-values-to-its-parent-class\/\",\"name\":\"How does a subclass in Scala assign values to its parent class? 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