static StudentSingleton()
{
_StudentSingleton = new StudentSingleton()
{
Id = 479,
Name = "悠悠吾心"
};
}
static void Main(string[] args)
{
try
{
{
for (int i = 0; i < 5; i++)
{
Student student = new Student()
{
Id = 1,
Name = "Ivan"
};
student.Study();
}
}
{
// 为了减少对象的创建， 重用对象，提升性能，所以用了单例
for (int i = 0; i < 5; i++)
{
StudentSingleton student = StudentSingleton.CreateInstance(); // new StudentSingleton()
student.Id = 1;
student.Name = "Ivan";
student.Study();
}
}
{
// 单例会导致数据被覆盖，因为student 和studentNew都指向同一个对象
StudentSingleton student = StudentSingleton.CreateInstance(); // new StudentSingleton()
student.Id = 1;
student.Name = "Ivan";
student.Study();
StudentSingleton studentNew = StudentSingleton.CreateInstance(); // new StudentSingleton()
studentNew.Id = 12;
studentNew.Name = "Ivan123";
studentNew.Study();
}
{
// 1. 避免重复创建对象，重复调用构造函数问题 -- 内存拷贝
// 2. 避免同一个对象覆盖的问题 -- 不同对象
StudentPrototype student = StudentPrototype.CreateInstance(); // new StudentSingleton()
student.Id = 1;
student.Name = "Ivan";
student.Study();
StudentPrototype studentNew = StudentPrototype.CreateInstance(); // new StudentSingleton()
studentNew.Id = 12;
studentNew.Name = "Ivan123";
studentNew.Study();
}
{
StudentPrototype student = StudentPrototype.CreateInstance(); // new StudentSingleton()
student.Id = 1;
student.Name = "Ivan";
student.Study();
StudentPrototype studentNew = StudentPrototype.CreateInstance(); // new StudentSingleton()
studentNew.Id = 12;
studentNew.Name = "Ivan123";
studentNew.Study();
StudentPrototype studentDouble = StudentPrototype.CreateInstance(); // new StudentSingleton()
studentDouble.Id = 123;
studentDouble.Name = "Ivan12342";
// 会覆盖StudentPrototype中初始化的班级信息，因为浅拷贝只拷贝了引用地址
studentDouble.Class.ClassId = 2;
studentDouble.Class.Name = "Advanced";
studentDouble.Study();
// 内存拷贝时 引用属性是拷贝的引用地址, 多个student的class指向的都是同一块内存
// 所以一个变化，全部都会变化
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
static void Main(string[] args)
{
try
{
Console.WriteLine("欢迎来到.net高级班公开课之设计模式特训，今天是Eleven老师为大家带来的原型模式PrototypePattern");
//Console.WriteLine("***************************");
//for (int i = 0; i < 5; i++)
//{
// Student student = new Student()
// {
// Id = 530,
// Name = "530-小昶-女-海口"
// };
// student.Study();
//}
//Console.WriteLine("***************************");
//for (int i = 0; i < 5; i++)
//{
// StudentSingleton student = StudentSingleton.CreateInstance();
// student.Study();
//}
//Console.WriteLine("***************************");
//for (int i = 0; i < 5; i++)
//{
// StudentPrototype student = StudentPrototype.CreateInstance();
// student.Study();
//}
Console.WriteLine("**********************************");
{
StudentSingleton student1 = StudentSingleton.CreateInstance();
StudentSingleton student2 = StudentSingleton.CreateInstance();
student1.Id = 506;
student1.Name = "yoyo";
Console.WriteLine("Id {0} Name {1}", student1.Id, student1.Name);
Console.WriteLine("Id {0} Name {1}", student2.Id, student2.Name);
}
Console.WriteLine("**********************************");
{
StudentPrototype student1 = StudentPrototype.CreateInstance();
StudentPrototype student2 = StudentPrototype.CreateInstance();
student1.Id = 387;
student1.Name = "天道无情";//==new String("天道无情")
Console.WriteLine("Id {0} Name {1}", student1.Id, student1.Name);
Console.WriteLine("Id {0} Name {1}", student2.Id, student2.Name);
student1.Class.Num = 2;
student1.Class.Remark = "特训班";
//student1.Class = new Class()
//{
// Num = 2,
// Remark = "特训班"
//};
Console.WriteLine("Class.Num {0} Class.Remark {1}", student1.Class.Num, student1.Class.Remark);
Console.WriteLine("Class.Num {0} Class.Remark {1}", student2.Class.Num, student2.Class.Remark);
}
Console.WriteLine("**********************************");
{
StudentPrototype student1 = StudentPrototype.CreateInstanceSerialize();
StudentPrototype student2 = StudentPrototype.CreateInstanceSerialize();
student1.Id = 387;
student1.Name = "天道无情";//==new String("天道无情")
Console.WriteLine("Id {0} Name {1}", student1.Id, student1.Name);
Console.WriteLine("Id {0} Name {1}", student2.Id, student2.Name);
student1.Class.Num = 2;
student1.Class.Remark = "特训班";
Console.WriteLine("Class.Num {0} Class.Remark {1}", student1.Class.Num, student1.Class.Remark);
Console.WriteLine("Class.Num {0} Class.Remark {1}", student2.Class.Num, student2.Class.Remark);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.Read();
}
static StudentSingleton()
{
_studentSingleton = new StudentSingleton();
}