{"id":20296,"date":"2024-03-15T20:15:31","date_gmt":"2024-03-15T20:15:31","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-achieve-polymorphism-in-java\/"},"modified":"2024-03-21T17:44:51","modified_gmt":"2024-03-21T17:44:51","slug":"how-to-achieve-polymorphism-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-achieve-polymorphism-in-java\/","title":{"rendered":"How to achieve polymorphism in Java?"},"content":{"rendered":"

In Java, implementing polymorphism requires satisfying the following conditions:<\/p>\n

    \n
  1. There is an inheritance relationship: subclasses inherit from parent classes or implement interfaces.<\/li>\n
  2. Override method: Subclass overrides methods in parent class (or interface).<\/li>\n
  3. The reference of the parent class (or interface) points to an object of the subclass.<\/li>\n<\/ol>\n

    Here is an example code demonstrating polymorphism.<\/p>\n

    \/\/ \u5b9a\u4e49\u4e00\u4e2a\u7236\u7c7b<\/span>\r\nclass<\/span> Animal<\/span> {\r\n    public<\/span> void<\/span> sound<\/span>()<\/span> {\r\n        System.out.println(\"\u52a8\u7269\u53d1\u51fa\u58f0\u97f3\"<\/span>);\r\n    }\r\n}\r\n\r\n\/\/ \u5b9a\u4e49\u4e24\u4e2a\u5b50\u7c7b\uff0c\u5206\u522b\u7ee7\u627f\u7236\u7c7b<\/span>\r\nclass<\/span> Cat<\/span> extends<\/span> Animal<\/span> {\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> sound<\/span>()<\/span> {\r\n        System.out.println(\"\u732b\u53d1\u51fa\u55b5\u55b5\u7684\u58f0\u97f3\"<\/span>);\r\n    }\r\n}\r\n\r\nclass<\/span> Dog<\/span> extends<\/span> Animal<\/span> {\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> sound<\/span>()<\/span> {\r\n        System.out.println(\"\u72d7\u53d1\u51fa\u6c6a\u6c6a\u7684\u58f0\u97f3\"<\/span>);\r\n    }\r\n}\r\n\r\npublic<\/span> class<\/span> PolymorphismExample<\/span> {\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> {\r\n        \/\/ \u7236\u7c7b\u7c7b\u578b\u7684\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u7684\u5bf9\u8c61<\/span>\r\n        Animal<\/span> animal1<\/span> =<\/span> new<\/span> Cat<\/span>();\r\n        Animal<\/span> animal2<\/span> =<\/span> new<\/span> Dog<\/span>();\r\n        \r\n        \/\/ \u8c03\u7528\u65b9\u6cd5\uff0c\u5b9e\u73b0\u591a\u6001<\/span>\r\n        animal1.sound(); \/\/ \u8f93\u51fa\uff1a\u732b\u53d1\u51fa\u55b5\u55b5\u7684\u58f0\u97f3<\/span>\r\n        animal2.sound(); \/\/ \u8f93\u51fa\uff1a\u72d7\u53d1\u51fa\u6c6a\u6c6a\u7684\u58f0\u97f3<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n
    In the above example code, Animal is the superclass, and Cat and Dog are subclasses of Animal. By using Animal type references to point to objects of Cat and Dog, polymorphism is achieved. When calling the sound() method, because the Animal type reference points to the actual object type, the corresponding subclass sound() method will be automatically called. The output will vary depending on the actual object type, demonstrating the characteristics of polymorphism.<\/p>\n","protected":false},"excerpt":{"rendered":"
    In Java, implementing polymorphism requires satisfying the following conditions: There is an inheritance relationship: subclasses inherit from parent classes or implement interfaces. Override method: Subclass overrides methods in parent class (or interface). The reference of the parent class (or interface) points to an object of the subclass. Here is an example code demonstrating polymorphism. \/\/ […]<\/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-20296","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow to achieve polymorphism in Java? - 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-to-achieve-polymorphism-in-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to achieve polymorphism in Java?\" \/>\n<meta property=\"og:description\" content=\"In Java, implementing polymorphism requires satisfying the following conditions: There is an inheritance relationship: subclasses inherit from parent classes or implement interfaces. 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