Replace Constructor with Factory Method <IMG SRC = "http://www.refactoring.com/catalog/updated.gif" border=0>

Replace Constructor with Factory Method

You want to do more than simple construction when you create an object.

Replace the constructor with a factory method.

        Employee (int type) {
                _type = type;
        }


        static Employee create(int type) {
                return new Employee(type);
        }

For more information see page 304 of Refactoring

Additional Comments

Dimitri Paltchoun pointed out that as well as using Class.forName() and a string for a client to specify the created class, you can also use the class object itself. This would lead you to method like

  static Employee create(Class c){
    try{
      return (Employee)c.newInstance();
    }catch(Exception e){
      throw new IllegalException("Unable to instantiate" +c);
   }
  }

This would be called from this code

   Employee.create(Engineer.class);




***** 아름다운프로님에 의해서 게시물 복사 + 카테고리변경되었습니다 (2003-12-18 17:27)