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Thread: Get static method to know which class it was called on

  1. #1
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    Default Get static method to know which class it was called on

    I am creating models, and in the base class for models, I need a static method that returns an instance of the class that the method was called on. As an example, when Person.getInstance() is called, I want new Person() to be returned.

    The problem for me is to find out what class the function was called on. Any suggestions?

    /**
     * The base class for models
     */
    public class BaseModel {
     
        public static BaseModel getInstance() {
            // I want this method to return an instance of the class that it was
            // called on, like Person or Vehicle.            
     
        }
     
    }
     
    public class Person extends BaseModel {
     
        public String name;
     
        public Person() {
            this.name = "John Doe";
        }
    }

  2. #2
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    Default Re: Get static method to know which class it was called on

    Not simple. If you know all possible Classes that extend BaseModel, you can test with the instanceof all possible Cases.
    For Example:
     if (this instanceof Person) ...

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Get static method to know which class it was called on

    In Person:
    public static Person getInstance() {
       return new Person();
    }

    I don't know if what you want can be done.

    Try asking on the Stack Overflow site.
    If you don't understand my answer, don't ignore it, ask a question.

  4. #4
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    Default Re: Get static method to know which class it was called on

    Quote Originally Posted by Norm View Post
    In Person:
    public static Person getInstance() {
       return new Person();
    }

    I don't know if what you want can be done.

    Try asking on the Stack Overflow site.
    I want the static function in the base class to return an instance of the class the function was called from. That function is intended to include a lot more code, and it would be greate to have just one function that did the job for all models inheriting the base.

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: Get static method to know which class it was called on

    Did you try asking on StackOverflow? There are a lot of more experienced programmers there.
    If you don't understand my answer, don't ignore it, ask a question.

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