Inheritance in Action - CSharp Custom Type

CSharp examples for Custom Type:Inheritance

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Introduction

To inherit from a class, you use this format: 

class derived_class : base_class

The colon ( :) is used to indicate inheritance by separating the new, derived_class, from the original, base_class.

Demo Code

using System;/* ww w .  j  a  va 2s. co  m*/
using System.Text;
class Person
{
    protected string firstName;
    protected string middleName;
    protected string lastName;
    private int age;
    public Person()
    {
    }
    public Person(string fn, string ln)
    {
        firstName = fn;
        lastName = ln;
    }
    public Person(string fn, string mn, string ln)
    {
        firstName = fn;
        middleName = mn;
        lastName = ln;
    }
    public Person(string fn, string mn, string ln, int a)
    {
        firstName = fn;
        middleName = mn;
        lastName = ln;
        age = a;
    }
    public void displayAge()
    {
        Console.WriteLine("Age {0}", age);
    }
    public void displayFullName()
    {
        StringBuilder FullName = new StringBuilder();
        FullName.Append(firstName);
        FullName.Append(" ");
        if (middleName != "")
        {
            FullName.Append(middleName[0]);
            FullName.Append(". ");
        }
        FullName.Append(lastName);
        Console.WriteLine(FullName);
    }
}
class Employee : Person
{
    private ushort hYear;
    public ushort hireYear
    {
        get { return (hYear); }
        set { hYear = value; }
    }
    public Employee() : base()
    {
    }
    public Employee(string fn, string ln) : base(fn, ln)
    {
    }
    public Employee(string fn, string mn, string ln, int a) :
    base(fn, mn, ln, a)
    {
    }
    public Employee(string fn, string ln, ushort hy) : base(fn, ln)
    {
        hireYear = hy;
    }
    public new void displayFullName()
    {
        Console.WriteLine("Employee: {0} {1} {2}",
        firstName, middleName, lastName);
    }
}
class NameApp
{
    public static void Main()
    {
        Person myWife = new Person("A", "A", "J", 21);
        Employee me = new Employee("B", "L", "J", 23);
        Employee you = new Employee("K", "R", 2000);
        myWife.displayFullName();
        myWife.displayAge();
        me.displayFullName();
        Console.WriteLine("Year hired: {0}", me.hireYear);
        me.displayAge();
        you.displayFullName();
        Console.WriteLine("Year hired of him: {0}", you.hireYear);
        you.displayAge();
    }
}

Result


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