How To Fix OO120 - A private method cannot be final (they are not inherited by subclasses)

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 120

• Message text: A private method cannot be final (they are not inherited by subclasses)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO120 - A private method cannot be final (they are not inherited by subclasses) ?

  The SAP error message "OO120 A private method cannot be final (they are not inherited by subclasses)" typically occurs in ABAP Object-Oriented programming when you attempt to declare a private method as FINAL. 
  Cause:
  In ABAP, a method declared as FINAL indicates that it cannot be overridden in any subclass. However, private methods are not inherited by subclasses at all. Since private methods cannot be accessed or overridden by subclasses, marking them as FINAL is redundant and not allowed, leading to this error message.
  Solution:
  To resolve this error, you should remove the FINAL keyword from the method declaration. Here’s how you can do it:
  
  Locate the Method Declaration: Find the method in your class where the error is occurring.
  Remove the FINAL Keyword: Change the method declaration from:
  METHOD my_private_method FINAL.
  to:
  METHOD my_private_method.
  
  
  Related Information:
  
  
  Access Modifiers: Understand the different access modifiers in ABAP:
  
  PUBLIC: Accessible from anywhere.
  PROTECTED: Accessible within the class and its subclasses.
  PRIVATE: Accessible only within the class itself.
  
  
  
  FINAL Keyword: The FINAL keyword is used to prevent method overriding in subclasses. It is only applicable to PROTECTED and PUBLIC methods.
  
  
  Best Practices: When designing your classes, consider the visibility and inheritance of methods carefully. Use FINAL only when you want to restrict method overriding and ensure that the method is either PUBLIC or PROTECTED.
  
  
  By following these guidelines, you can avoid the OO120 error and ensure that your ABAP code adheres to the principles of object-oriented programming.