static void Main(string[] args)
{
SingeltonDemo s1 = SingeltonDemo.GetInstance();
SingeltonDemo s2 = SingeltonDemo.GetInstance();
if (s1 == s2)
{
Console.WriteLine("equal");
}
object obj1 = null;
object obj2 = null;
Thread thread1 = new Thread(() =>
{
obj1 = SingeltonDemo.GetInstance1();
});
thread1.Start();
Thread thread2 = new Thread(() =>
{
obj2 = SingeltonDemo.GetInstance1();
});
thread2.Start();
thread1.Join();
thread2.Join();
if (obj2 != null && obj1 != null && obj2 == obj1)
{
Console.WriteLine("equal2");
}
Console.Read();
}
//非多线程
public static SingeltonDemo GetInstance()
{
if (singeltonDemo == null)
{
singeltonDemo = new SingeltonDemo();
}
return(singeltonDemo);
}
//考虑多线程，但每次都加锁，耗资源
public static SingeltonDemo GetInstance1()
{
lock (sy)
{
if (singeltonDemo2 == null)
{
singeltonDemo2 = new SingeltonDemo();
}
}
return(singeltonDemo2);
}
