{"id":19734,"date":"2024-03-15T19:23:17","date_gmt":"2024-03-15T19:23:17","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-constructor-in-java-called\/"},"modified":"2024-03-21T16:24:36","modified_gmt":"2024-03-21T16:24:36","slug":"how-is-the-constructor-in-java-called","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-constructor-in-java-called\/","title":{"rendered":"How is the constructor in Java called?"},"content":{"rendered":"

In Java, a constructor is a special method used to create objects that is automatically called when the object is created. The constructor is invoked by using the keyword “new”.<\/p>\n

When calling the constructor method, the following steps need to be followed:<\/p>\n

    \n
  1. fresh<\/li>\n
  2. Create a new instance of the ClassName class and assign it to the objectName variable.<\/li>\n
  3. I need to finish my homework before dinner.<\/li>\n
  4. Create a new object of the class ClassName and name it objectName.<\/li>\n<\/ol>\n

    Important Notes:<\/p>\n

      \n
    1. The name of the constructor must be identical to the class name.<\/li>\n
    2. Constructor methods do not have a return type, so there is no need to use the void keyword to declare a return type.<\/li>\n
    3. If no constructor is defined, a default parameterless constructor will be provided by default.<\/li>\n
    4. If one or more constructors are defined in a class, the appropriate constructor method must be selected and called based on the types and number of parameters when creating an object.<\/li>\n<\/ol>\n

      Here is an example demonstrating how to call a constructor:<\/p>\n

      public<\/span> class<\/span> Person<\/span> {\r\n    private<\/span> String name;\r\n    private<\/span> int<\/span> age;\r\n    \r\n    \/\/ \u65e0\u53c2\u6784\u9020\u65b9\u6cd5<\/span>\r\n    public<\/span> Person<\/span>()<\/span> {\r\n        name = \"John\"<\/span>;\r\n        age = 30<\/span>;\r\n    }\r\n    \r\n    \/\/ \u6709\u53c2\u6784\u9020\u65b9\u6cd5<\/span>\r\n    public<\/span> Person<\/span>(String n, int<\/span> a)<\/span> {\r\n        name = n;\r\n        age = a;\r\n    }\r\n    \r\n    public<\/span> String getName<\/span>()<\/span> {\r\n        return<\/span> name;\r\n    }\r\n    \r\n    public<\/span> int<\/span> getAge<\/span>()<\/span> {\r\n        return<\/span> age;\r\n    }\r\n    \r\n    public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span> {\r\n        \/\/ \u8c03\u7528\u65e0\u53c2\u6784\u9020\u65b9\u6cd5<\/span>\r\n        Person<\/span> person1<\/span> =<\/span> new<\/span> Person<\/span>();\r\n        System.out.println(\"Name: \"<\/span> + person1.getName());\r\n        System.out.println(\"Age: \"<\/span> + person1.getAge());\r\n        \r\n        \/\/ \u8c03\u7528\u6709\u53c2\u6784\u9020\u65b9\u6cd5<\/span>\r\n        Person<\/span> person2<\/span> =<\/span> new<\/span> Person<\/span>(\"Tom\"<\/span>, 25<\/span>);\r\n        System.out.println(\"Name: \"<\/span> + person2.getName());\r\n        System.out.println(\"Age: \"<\/span> + person2.getAge());\r\n    }\r\n}\r\n<\/code><\/pre>\n
      The output result is:<\/p>\n
      Name: John\r\nAge: 30\r\nName: Tom\r\nAge: 25\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
      In Java, a constructor is a special method used to create objects that is automatically called when the object is created. The constructor is invoked by using the keyword “new”. When calling the constructor method, the following steps need to be followed: fresh Create a new instance of the ClassName class and assign it to […]<\/p>\n","protected":false},"author":6,"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-19734","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow is the constructor in Java called? - 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-is-the-constructor-in-java-called\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How is the constructor in Java called?\" \/>\n<meta property=\"og:description\" content=\"In Java, a constructor is a special method used to create objects that is automatically called when the object is created. 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