Constructor (object-oriented Programming) - Object Pascal

Object Pascal

In Object Pascal, the constructor is similar to a factory method. The only syntactic difference to regular methods is the keyword constructor in front of the name (instead of procedure or function). It can have any name, though the convention is to have Create as prefix, such as in CreateWithFormatting. Creating an instance of a class works like calling a static method of a class: TPerson.Create('Peter').

program OopProgram; interface type TPerson = class private FName: string; public property Name: string read FName; constructor Create(AName: string); end; implementation constructor TPerson.Create(AName: string); begin FName := AName; end; var Person: TPerson; begin Person := TPerson.Create('Peter'); // allocates an instance of TPerson and then calls TPerson.Create with the parameter AName = 'Peter' end;