static void Main(string[] args)
{
#region _01里氏转换
/*
* 1.子类可以赋值给父类
* 2.如果父类中装的是子类对象，那么可以讲这个父类强转为子类对象
* 3.is:成功true,失败false!
* as:成功返回对应的对象，失败返回null;
*/
//Student s = new Student();
//Person p = new Person();
//Person p = s; //子类可以赋值给父类
Person p = new Student(); //1条
Student ss = (Student)p;//2条
if (p is Teacher)
{
Teacher ss1 = (Teacher)p;
ss1.TeacherSayHello();
}
else
{
Console.WriteLine("转换失败");
}
Teacher t = p as Teacher;
ss.StudentSayHello();
string str = string.Join("|", new string[] { "1", "2", "3", "4" });
Console.WriteLine(str);
#endregion
Console.ReadKey();
}
static void Main(string[] args)
{
//创建10个对象通过一个循环去调用他们各自打招呼的方法
Person[] pers = new Person[10];
Random r = new Random();
for (int i = 0; i < pers.Length; i++)
{
int rNumber = r.Next(1, 7);
switch (rNumber)//1-6;
{
case 1:pers[i]=new Student();
break;
case 2: pers[i] = new Teacher();
break;
case 3: pers[i] = new ShuaiGuo();
break;
case 4: pers[i] = new MeiLv();
break;
case 5: pers[i] = new YeShou();
break;
case 6: pers[i] = new Person();
break;
}
}
for (int i = 0; i < pers.Length; i++)
{
//pers[i].PersonSayHi();
if (pers[i] is Student)
{
((Student)pers[i]).StudentSayHi();
}
else if (pers[i] is Teacher)
{
((Teacher)pers[i]).TeacherSayHi();
}
else if (pers[i] is ShuaiGuo)
{
((ShuaiGuo)pers[i]).ShuaiGuoSayHi();
}else if(pers[i] is YeShou){
((YeShou)pers[i]).YeShouSayHi();
}else if(pers[i] is MeiLv){
((MeiLv)pers[i]).MeiLvSayHi();
}else{
pers[i].PersonSayHi();
}
}
Console.ReadKey();
}