Delphi 设计模式：《HeadFirst设计模式》Delphi7代码
没有应用状态模式的代码
1. 工程文件
program Project1;
{$APPTYPE CONSOLE}
uses
uGumballMachine in 'uGumballMachine.pas';
var
aGumballMachine: TGumballMachine;
begin
aGumballMachine := TGumballMachine.Create(5);
aGumballMachine.InsertQuarter;
aGumballMachine.TurnCrank;
Writeln;
aGumballMachine.InsertQuarter;
aGumballMachine.EjectQuarter;
aGumballMachine.TurnCrank;
Writeln;
aGumballMachine.InsertQuarter;
aGumballMachine.TurnCrank;
aGumballMachine.InsertQuarter;
aGumballMachine.TurnCrank;
aGumballMachine.EjectQuarter;
Writeln;
aGumballMachine.InsertQuarter;
aGumballMachine.InsertQuarter;
aGumballMachine.TurnCrank;
aGumballMachine.InsertQuarter;
aGumballMachine.TurnCrank;
aGumballMachine.InsertQuarter;
aGumballMachine.TurnCrank;
aGumballMachine.Free;
Readln;
end.
2.单元文件
unit uGumballMachine;
interface
type
TGumballMachine = class(TObject)
private
FState: Integer;
FCount: Integer;
public
constructor Create(aCount: Integer);
procedure InsertQuarter;
procedure EjectQuarter;
procedure TurnCrank;
procedure Dispense;
end;
implementation
const
SOLD_OUT = 0;
NO_QUARTER = 1;
HAS_QUARTER = 2;
SOLD = 3;
{ TGumballMachine }
constructor TGumballMachine.Create(aCount: Integer);
begin
FCount := aCount;
FState := SOLD_OUT;
if FCount > 0 then
FState := NO_QUARTER;
end;
procedure TGumballMachine.Dispense;
begin
if FState = SOLD then
begin
Writeln('A gumball comes rolling out the slot');
FCount := FCount - 1;
if FCount = 0 then
begin
Writeln('Oops, out of Gumballs');
FState := SOLD_OUT;
end
else
FState := NO_QUARTER;
end;
if FState = NO_QUARTER then
Writeln('You need to pay first');
if FState = SOLD_OUT then
Writeln('No gumball dispensed');
if FState = HAS_QUARTER then
Writeln('No gumball dispensed');
end;
procedure TGumballMa
相关文档：
Python , Delphi , Loki 三个单词有趣的来源
许多程序设计语言和开发工具以及库的名字都来源与神话，颇有意思：
阿波罗是同时出现在希腊和罗马神话中的奥林帕斯十二大神之一。他除了拥有太阳神的身分，同时还有预言、艺术、医术之神的称号。阿波罗是宙斯和乐朵的儿子，和阿蒂蜜斯是� ......
推荐给大家[url=DELPHI深度探索 （第2版）PDF电子书][/url]
因为需要前几天在网上搜搜过这本书书，可没有，源码倒是有，今天打开经常去的网站，居然发现提供下载了，这个网站自己差不多每天都要打开看看，这几天忙糊涂了，居然没有看到，在这推荐给大家，能下载的，速度很快。
[url=http://www.delphifans.com/Soft ......
//定义MyClass
TMyClass = class
GUID: string;
Name: string;
bSex: Boolean;
Tel : string;
end;
//取值
var
obj: TMyClass;
begin
obj := TMyClass.Create;
with Memo1.Lines do
begin
Add('对象大小:' + IntToStr(obj.InstanceSize));
Add('对象所在地址：'+ ......
继承是为了表现类与类之间“是一种”关系，是多态存在的基础，继承是面象对象必不可少的基础，只支持封装而不支持继承的语言只能称为“基于对象”（Object-Based）面非面向对象“Object-Oriented”;
Object Pascal只支持单继承，也就是一个派生类只能有一个基类
但可以实现多个接口 ......
1. 命令的接受者
unit uReceiveObject;
interface
type
TLight = class(TObject)
public
procedure Open;
procedure Off;
end;
TGarageDoor = class(TObject)
public
procedure Up;
procedure Down;
procedure Stop;
procedure LightOn;
procedure LightOff;
end; ......
