static void Main(string[] args)
{
Console.WriteLine("LoadBalancer:");
LoadBalancer b1 = LoadBalancer.GetLoadBalancer();
LoadBalancer b2 = LoadBalancer.GetLoadBalancer();
LoadBalancer b3 = LoadBalancer.GetLoadBalancer();
LoadBalancer b4 = LoadBalancer.GetLoadBalancer();
if (b1 == b2 && b2 == b3 && b3 == b4)
{
Console.WriteLine("Same instance");
}
//第一次使用時，才產生實例
Console.WriteLine("Lazy singleton:");
Singleton_LazyInitialization S1 = Singleton_LazyInitialization.GetInstance();
Singleton_LazyInitialization S2 = Singleton_LazyInitialization.GetInstance();
if (S1 == S2)
{
Console.WriteLine("Same instance");
}
//class 載入時，即產生實例
Console.WriteLine("Eager singleton:");
Singleton_EagerInitialization S3 = Singleton_EagerInitialization.GetInstance();
Singleton_EagerInitialization S4 = Singleton_EagerInitialization.GetInstance();
if (S3 == S4)
{
Console.WriteLine("Same instance");
}
Console.ReadKey();
}
public static Singleton_LazyInitialization GetInstance()
{
if (null == instance)
{
lock (thisLock)
{
if (null == instance)
{
instance = new Singleton_LazyInitialization();
}
}
}
return(instance);
}
