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    Delphi Error – E2539 Missing implementation for abstract method ‘%s.%s’

    admin November 17, 2022 No Comments

    Delphi Compiler Error

    E2539 Missing implementation for abstract method ‘%s.%s’

    Reason for the Error & Solution

    This occurs when you fail to implement abstract methods in a derived class that is also declared sealed (can no longer be derived from). 

    program E2539;
{E2539 Missing implementation for abstract method '%s.%s'}
{$APPTYPE CONSOLE}

uses
  SysUtils;

type
  MyClass = class abstract
    public
      procedure MyAbstract (a:integer; s: string); virtual; abstract;
  end;

  MyDerivClass = class sealed(MyClass)
  public

  end;

 var
   MyObj: MyDerivClass;

begin
   MyObj := MyDerivClass.Create;

end.

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