public static NullMobile GetInstance()
{
if (_instance == null)
{
_instance = new NullMobile();
}
return(_instance);
}
public IMobile GetPhoneByCompany(string mobilePhone)
{
if (mobilePhone.ToLower() == "sony")
{
return(new SonyMobile());
}
else if (mobilePhone.ToLower() == "samsung")
{
return(new SamsungMobile());
}
else
{
return(NullMobile.GetInstance());
}
}