How To Fix OO611 - Method cannot be implemented as final and abstract at the same time

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 611

• Message text: Method cannot be implemented as final and abstract at the same time

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• What is the cause and solution for SAP error message OO611 - Method cannot be implemented as final and abstract at the same time ?

  The SAP error message "OO611 Method cannot be implemented as final and abstract at the same time" typically occurs in the context of ABAP Object-Oriented programming. This error arises when a method in a class is declared both as FINAL and ABSTRACT, which is contradictory and not allowed in ABAP.
  Cause:
  
  Final Method: A method declared as FINAL cannot be overridden in any subclass. It is meant to be the last implementation of that method.
  Abstract Method: A method declared as ABSTRACT does not have an implementation in the class where it is declared. It is intended to be implemented in subclasses.
  
  When you declare a method as both FINAL and ABSTRACT, it creates a conflict because an abstract method is expected to be implemented in subclasses, while a final method cannot be overridden. This contradiction leads to the OO611 error.
  Solution:
  To resolve this error, you need to modify the method declaration in your class. You have two options:
  
  
  Remove the FINAL Keyword: If you want the method to be abstract and implemented in subclasses, remove the FINAL keyword from the method declaration.
  METHOD my_method ABSTRACT.
  
  
  Remove the ABSTRACT Keyword: If you want the method to be final and not overridden, remove the ABSTRACT keyword and provide an implementation for the method.
  METHOD my_method.
    " Implementation code here
  ENDMETHOD.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for more details on object-oriented programming in ABAP, including the use of FINAL and ABSTRACT keywords.
  Best Practices: Ensure that your class design follows best practices in object-oriented programming. Use FINAL for methods that should not be changed and ABSTRACT for methods that must be implemented by subclasses.
  Testing: After making changes, test your class to ensure that it behaves as expected and that the error is resolved.
  
  By addressing the conflict between the FINAL and ABSTRACT keywords, you should be able to eliminate the OO611 error and successfully compile your ABAP code.