Notions fondamentales de Programmation Orientée Objet avec Free Pascal/Lazarus

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
unit other;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils;

type

  { TMyClass }

  TMyClass = class
    strict private
      fMyStrictPrivateField: Integer;
    private
      fMyPrivateField: Integer;
    public
      fMyPublicField: Integer;
      function InternalMyFunct: Integer;
  end;

  { TMyOtherClass }

  TMyOtherClass = class
    public
      ASubClass: TMyClass;
      constructor Create;
      destructor Destroy; override;
  end;

  { MyThirdClass }

  MyThirdClass = class(TMyClass)
    public
      function MyFunc: Integer;
    end;

  procedure MyProc;

implementation

procedure MyProc;
var
  AnObject: TMyClass;
begin
  AnObject := TMyClass.Create;
  try
    AnObject.fMyPublicField := 1;
    AnObject.fMyPrivateField := 3;
    //AnObject.fMyStrictPrivateField := 2; ne compile pas
  finally
    AnObject.Free;
  end;
end;

{ MyThirdClass }

function MyThirdClass.MyFunc: Integer;
begin
  Result := fMyPrivateField;
  //Result := fMyStrictPrivateField; ne compile pas
end;

{ TMyClass }

function TMyClass.InternalMyFunct: Integer;
begin
  Result := fMyStrictPrivateField;
end;

{ TMyOtherClass }


constructor TMyOtherClass.Create;
begin
  inherited;
  ASubClass := TMyClass.Create;
  ASubClass.fMyPrivateField := 1;
  ASubClass.fMyPrivateField := 4;
  // ASubClass.fMyStrictPrivateField:= 5; ne compile pas
end;

destructor TMyOtherClass.Destroy;
begin
  ASubClass.Free;
  inherited Destroy;
end;

end.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
unit other2;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, other;

type

  { TMyFourthClass }

  TMyFourthClass = class(TMyClass)
    public
      procedure MyProc;
  end;

procedure MyProc;

implementation


procedure MyProc;
var
  AnObject: TMyClass;
begin
  AnObject := TMyClass.Create;
  try
    AnObject.fMyPublicField := 1;
    // AnObject.fMyPrivateField := 3; ne compile pas
    //AnObject.fMyStrictPrivateField := 2; ne compile pas
  finally
    AnObject.Free;
  end;
end;

{ TMyFourthClass }

procedure TMyFourthClass.MyProc;
begin
  fMyPublicField:= 7;
  //fMyPrivateField := 9; ne compile pas
  //fMyStrictPrivateField := 10; ne compile pas
end;


end.