C# 0 The Complete Reference

PART I

C h a p t e r   1 8 :  

G e n e r i c s  

507

PART IPART I

// A base class that stores a name and phone number.

class PhoneNumber {

  public PhoneNumber(string n, string num) {

    Name = n;

    Number = num;

  }

  // Auto-implemented properties that hold a name and phone number.

  public string Number { get; set; }

  public string Name { get; set; }

}

Next, you create two classes that inherit 

PhoneNumber

:

Friend

 and 

Supplier

. They are 

shown here:

// A class of phone numbers for friends.

class Friend : PhoneNumber {

  public Friend(string n, string num, bool wk) :

    base(n, num)

  {

    IsWorkNumber = wk;

  }

  public bool IsWorkNumber { get; private set; }

  // ...

}

// A class of phone numbers for suppliers.

class Supplier : PhoneNumber {

  public Supplier(string n, string num) :

    base(n, num) { }

  // ...

}

Notice that