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Classes, objects and interfaces (code generators and data classes (object,…

- - - - not allow subclasses override this function
  - - - internal only modules
    - - in kotlin only subclasses can access
- - - - open class Button
        
        class RadioButton: Button()
        
        need declares () empty, as constructor
- - - - uses all properties in primary constructor
  - - - create static properties and fields in a class
    - - Singleton Pattern
        
        object Payroll{}
        
        it doesnt allowed constructor