using System;
class Base
{
/*
* public 的可访问范围是所有类
* private 的可访问范围是当前类
* protected 的可访问范围是当前类及其子类
*/
public string name = "Tom";
private double salary = 1500;
protected int age = 20;
public virtual void ShowInfo()
{
Console.WriteLine(this.name); //可以,因为name是 public 型的
Console.WriteLine(this.salary); //可以,salary是private型,在Base类中可以访问
Console.WriteLine(this.age); //可以,因为age是protected型,在子类中可以访问
}
}
class Derived : Base
{
public override void ShowInfo()
{
Console.WriteLine(this.name); //可以,因为name是 public 型的
//Console.WriteLine(this.salary); //不可以,salary是private型,超出Base就无法访问
Console.WriteLine(this.age); //可以,因为age是protected型,在子类中可以访问
}
}
class Client
{
public static void Main()
{
Base b = new Base();
Console.WriteLine(b.name); //可以,因为name是 public 型的
//Console.WriteLine(this.salary); //不可以,salary是private型,超出Base就无法访问
//Console.WriteLine(this.age); //不可以,因为age是protected型,Client不是Base的子类
Console.WriteLine("==========================");
b.ShowInfo();
Console.WriteLine("==========================");
Derived d = new Derived();
d.ShowInfo();
}
}