static void Main(string[] args)
{
Person p = new Chinese("张三");
Person p1 = new Korean("赵仁焕");
Person p2 = new Americans("Mr.One");
Person[] per = { p, p1, p2, new Chinese("张飞"), new Americans("Mr.Two") };
for (int i = 0; i < per.Length; i++)
{
// 不用虚方法的话
if (per[i] is Chinese)
{
((Chinese)per[i]).SayHello();
}
else if (per[i] is Korean)
{
((Korean)per[i]).SayHello();
}
else
{
((Americans)per[i]).SayHello();
}
//使用虚方法的情况
per[i].SayHello();
}
Console.ReadKey();
}
static void Main(string[] args)
{
Person p = new Person("盘古");
Chinese ch = new Chinese("姚明");
American am = new American("科比");
Person[] parr = { p, ch, am };
foreach (var item in parr)
{
item.SayHello();
}
Console.ReadKey();
}
static void Main(string[] args)
{
Chinese ch1 = new Chinese("Li Lei");
Chinese ch2 = new Chinese("Han Meimei");
American a1 = new American("Rain");
American a2 = new American("Emma");
Person[] persons = new Person[] { ch1, ch2, a1, a2 };
foreach (var item in persons)
{
item.Hello();
}
Console.ReadKey();
}
static void Main(string[] args)
{
Chinese cn1 = new Chinese("张三");
Chinese cn2 = new Chinese("李四");
Japanese ja = new Japanese("半泽值树");
Korea ko = new Korea("思密达");
American am = new American("川普");
Person p = new Person();//用虚方法实现多态主要原因就是我们需要实例化父类
Person[] person = new Person[6] {
cn1, cn2, ja, ko, am, p
};
foreach (Person item in person)
{
item.SayHello();
}
Console.ReadKey();
}
static void Main(string[] args)
{
//多态概念：让一个对象表现出多种状态（类型）
//实现多态主要有三种手段：1、虚方法 2、抽象类 3、接口
//虚方法：首先将父类的方法标记为虚方法，使用关键字 virtual 。效果就是这个函数可以被子类重新写一遍(可以提取出父类的前提下)
//当父类方法不知道如何去实现的时候，可以考虑将父类写成抽象类，将方法写成抽象方法
//抽象类：抽象类的关键字 abstract 方法也一样. 抽象方法是不允许有方法体
Chinese chin = new Chinese("我媳妇");
Chinese chin1 = new Chinese("她老头");
Japanese j1 = new Japanese("树下君");
Japanese j2 = new Japanese("井边子");
Korea k1 = new Korea("金秀贤");
Korea k2 = new Korea("金贤秀");
American a1 = new American("科比布莱恩特");
American a2 = new American("奥沙利文");
Person[] pers = new Person[] { chin, chin1, j1, j2, k1, k2, a1, a2 };
for (int i = 0; i < pers.Length; i++)
{
//if(pers[i] is Chinese)
//{
// ((Chinese)pers[i]).SayHello();
//}else if(pers[i] is Japanese)
//{
// ((Japanese)pers[i]).SayHello();
//}else if(pers[i] is Korea)
//{
// ((Korea)pers[i]).SayHello();
//}
//else
//{
// ((American)pers[i]).SayHello();
//}
pers[i].SayHello();
}
}