/// <summary>
/// 获取单例实例
/// 经典的单例模式 不是线程安全的 存在并发的问题
/// </summary>
/// <returns></returns>
public static ClassicSingleton GetInstance()
{
if (_instance == null)
{
_instance = new ClassicSingleton();
}
return(_instance);
}
/// <summary>
/// 获取单例实例
/// 经典的单例模式 不是线程安全的 存在并发的问题
/// </summary>
/// <returns></returns>
public static ClassicSingleton GetInstance()
{
if (_instance == null)
{
_instance = new ClassicSingleton();
}
return _instance;
}
static void Main(string[] args)
{
ClassicSingleton classicSingleton1 = ClassicSingleton.GetInstance();
ClassicSingleton classicSingleton2 = ClassicSingleton.GetInstance();
Console.WriteLine(classicSingleton1 == classicSingleton2);
SingletonV1 singletonV1_1 = SingletonV1.GetInstance();
SingletonV1 singletonV1_2 = SingletonV1.GetInstance();
Console.WriteLine(singletonV1_1 == singletonV1_2);
SingletonV2 singletonV2_1 = SingletonV2.GetInstance();
SingletonV2 singletonV2_2 = SingletonV2.GetInstance();
Console.WriteLine(singletonV2_1 == singletonV2_2);
Console.ReadLine();
}