namespace _013_练习题 {
class Program {
//static void Main(string[] args) {
//}
}
abstract class BaseClass {
public virtual void MethodA() { Console.WriteLine("BaseClass"); }
public virtual void MethodB() { }
}
class Class1 : BaseClass {
public void MethodA() { Console.WriteLine("Class1"); }//如果一个虚函数 在子类中没有通过override关键字，那么这个方法就没有被重写，而是被隐藏了
public override void MethodB() { }
}
class Class2 : Class1 {
new public void MethodB() { }
}
class MainClass {
//public static void Main(string[] args) {
// //Class2 o = new Class2(); o.MethodA();
// Class1 o = new Class1();
// BaseClass o2 = o;
// o2.MethodA();
// o.MethodA();
// Console.ReadKey();
//}
}
public abstract class A {
public A() { Console.WriteLine('A'); }
public virtual void Fun() { Console.WriteLine("A.Fun()"); }
}
public class B : A {
public B() { Console.WriteLine('B'); }
public new void Fun() { Console.WriteLine("B.Fun()"); }
//public static void Main() { A a = new B(); a.Fun(); }
}
public abstract class Animal{
public abstract void Eat();
}
public class Tiger:Animal{
public override void Eat(){
Console.WriteLine("老虎吃动物");
}
}
public class Tigress:Tiger{
// static void Main(){
// Tigress tiger=new Tigress();
// tiger.Eat();
//}
}
public class Student {
public virtual void Exam() {
Console.WriteLine("学生都要考试");
}
}
public class Undergraduate : Student {
public new void Exam() {
base.Exam();
Console.WriteLine("大学生有选择考试科目的权利");
}
}
public class Test {
static void Main() {
Student stu = new Undergraduate();
stu.Exam();
}
}
}
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