public static SingletonA GetInstance()
{
if (instance == null)
{
lock (syncRoot)
{
if (instance == null)
{
instance = new SingletonA();
}
}
}
return(instance);
}
static void Main(string[] args)
{
SingletonA s1 = SingletonA.GetInstance();
SingletonA s2 = SingletonA.GetInstance();
if (s1 == s2)
{
Console.WriteLine("{0}和{1}是相等的", s1, s2);
}
SingletonB s3 = SingletonB.GetInstance();
SingletonB s4 = SingletonB.GetInstance();
if (s3 == s4)
{
Console.WriteLine("{0}和{1}是相等的", s3, s4);
}
}
