static void Main()
{
IBM ibm = new IBM("IBM", 120.00);
TP TP = new TP("TP", 10.00);
Investor Jonhy = new Investor("João");
Investor Rui = new Investor("Rui");
ibm.Attach(Rui);
ibm.Attach(Jonhy);
ibm.Attach(new Investor("Miguel"));
ibm.Attach(new Investor("Aga"));
TP.Attach(Rui);
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
TP.Price *= 2;
ibm.Detach(Jonhy);
ibm.Price = 120.75;
TP.Price *= 2;
Console.ReadKey();
}
static void Main(string[] args)
{
// create investors
Investor ivrInvestor1 = new Investor("ivrInvestor1");
Investor ivrInvestor2 = new Investor("ivrInvestor2");
Investor ivrInvestor3 = new Investor("ivrInvestor3");
Investor ivrInvestor4 = new Investor("ivrInvestor4");
Investor ptraInvestor1 = new Investor("ptraInvestor1");
Investor ptraInvestor2 = new Investor("ptraInvestor2");
//create stocks
Stock ivr = new IVR("IVR", 2.1);
Stock ptra = new PTRA("PTRA", 7.7);
//attach investors to stock
ivr.Attach(ivrInvestor1);
ivr.Attach(ivrInvestor2);
ivr.Attach(ivrInvestor3);
ivr.Attach(ivrInvestor4);
ptra.Attach(ptraInvestor1);
ptra.Attach(ptraInvestor2);
//change the price of stock
ivr.Price = 1.9;
ivr.Price = 1.9;
ivr.Price = 9.9;
ptra.Price = 7.9;
}
static void Main(string[] args)
{
Console.WriteLine("Observer Pattern through Go4");
IInvestor User1 = new Investor("User1");
IInvestor User2 = new Investor("User2");
IBM iBM = new IBM(10, "IBM");
iBM.Register(User1);
iBM.Register(User2);
iBM.Price = 20;
}
static void Main(string[] args)
{
IBM ibm = new IBM("IBM", 120.0);
Investor investor1 = new Investor("John");
Investor investor2 = new Investor("Jack");
Investor investor3 = new Investor("Emily");
Investor investor4 = new Investor("Scarlett");
ibm.AddAllListeners(investor1, investor2, investor3, investor4);
ibm.CalculatePriceChange(130.0);
Console.ReadKey();
}
public static void Main(string[] args)
{
// 创建投资者对象
Investor m = new Investor("Mike");
Investor b = new Investor("Bob");
// 创建 IBM stock对象并添加投资者
IBM ibm = new IBM("IBM", 120.00);
ibm.Attach(m);
ibm.Attach(b);
// 改变股票价格，将会自动通知投资者
ibm.Price = 120.10;
ibm.Price = 121.00;
ibm.Price = 120.50;
ibm.Price = 120.75;
}
static void Main(string[] args)
{
// Create subject
Stock stock = new IBMStock("IBM", 21.76);
// Create observers
IInvestor investor = new Investor("Investor 1");
IInvestor investor2 = new Investor("Investor 2");
// Attach observers to subject
stock.Attach(investor);
stock.Attach(investor2);
// Update prices (will notify investors)
stock.Price = 21.80;
stock.Price = 21.86;
stock.Price = 21.90;
stock.Price = 21.99;
}
// 删除投资者
public void Detach(Investor investor)
{
investors.Remove(investor);
}
// 添加投资者
public void Attach(Investor investor)
{
investors.Add(investor);
}
