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class hierarchy and casting

Up casting

Up casting is a cast towards its super class or parent class.


using System;
class Person
{
    public string name;
}
class Employee : Person
{
    public string companyName;
}

class Program
{
    static void Main(string[] args)
    {
        Employee e = new Employee();
        e.name = "java2s.com";


        Person p = e;
        Console.WriteLine(e.name);
        Console.WriteLine(p.name);
       
    }
}

The output:


java2s.com
java2s.com

Down cast

Down cast happens when casting to subclass or child class.

Down cast needs an explicit cast.


using System;
class Person
{
    public string name;
}
class Employee : Person
{
    public string companyName;
}

class Program
{
    static void Main(string[] args)
    {
        Person p = new Employee();

        Employee e = (Employee)p;
       
    }
}

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