Schedule

Schedule

Tuesday, September 30

1412096400 Tech News Today
1412100000 MacBreak Weekly
1412107200 Security Now
1412114400 Before You Buy
1412118000 Tech News 2Night
1412121600 All About Android
1412130600 Padre's Corner

Wednesday, October 1

1412177400 FLOSS Weekly
1412182800 Tech News Today
1412186400 Windows Weekly
1412193600 This Week in Google
1412204400 Tech News 2Night
1412211600 Ham Nation

Thursday, October 2

1412269200 Tech News Today
1412272800 Know How...
1412276400 Marketing Mavericks
1412281800 Coding 101
1412285400 Home Theater Geeks
1412290800 Tech News 2Night
1412292600 The Giz Wiz

Friday, October 3

1412355600 Tech News Today
1412359200 This Week in Law
1412366400 Android App Arena
1412377200 Tech News 2Night

Saturday, October 4

1412445600 The Tech Guy

Sunday, October 5

1412532000 The Tech Guy
1412546400 This Week in Tech

Monday, October 6

1412614800 Tech News Today
1412618400 Triangulation
1412623800 iPad Today
1412636400 Tech News 2Night

Tuesday, October 7

1412701200 Tech News Today
1412704800 MacBreak Weekly
1412712000 Security Now
1412719200 Before You Buy
1412722800 Tech News 2Night
1412726400 All About Android
1412735400 Padre's Corner

Wednesday, October 8

1412782200 FLOSS Weekly
1412787600 Tech News Today
1412791200 Windows Weekly
1412798400 This Week in Google
1412809200 Tech News 2Night
1412816400 Ham Nation

Thursday, October 9

1412874000 Tech News Today
1412877600 Know How...
1412881200 Marketing Mavericks
1412886600 Coding 101
1412890200 Home Theater Geeks
1412895600 Tech News 2Night
1412897400 The Giz Wiz

Most Recent Episodes

This Week in Enterprise Tech
Episode #109: The IxCharriot September 29th, 2014

Troubleshooting your network with IxChariot

iPad Today

MyScript, Fleksy, hidden iOS albums

Tech News 2Night

The app powering the Hong Kong protests.

Triangulation

How to use Facebook better.

Tech News Today

China's iPhone 6 black market falls apart.

The Tech Guy
The Tech Guy 1122 September 28th, 2014

Why Apple's BendGate is bogus, iPhoto alternatives, how to screencast, and you calls.

This Week in Tech
Episode #477: Ello Moto September 28th, 2014

Shellshock, Ello, bitter Twitter, Bendghazi, and more.

The Tech Guy
The Tech Guy 1121 September 27th, 2014

How can I synchronize my documents across devices?

Tech News 2Night
Episode #181: The Rise of Ello September 26th, 2014

Apple to Patch Shellshock Bug

Android App Arena
Episode #14: Kart Racing Games September 26th, 2014

Hands-on reviews of Beach Buggy Racing, SEGA All-Stars Racing, Angry Birds Go!, and Goat Simulator.

Coding 101 32

C# Abstract Classes and Interfaces

August 28 2014

Hosts: Fr. Robert Ballecer, SJ and Shannon Morse

Guest: Lou Maresca

The Code for today's show is available at our: Github

Snubs Compiled
No Viewer Submitted Code, however we did get some useful tips for C# from our community:

Cosmic Ray links us to a C# Fundamentals series that's super useful for newbies!

Nathan says learning the syntax of the languages is great, but you need to know how to problem solve!

Kelvin links us to Mono, for Mac users

Joe gives us info on how to get C# running via notepad!

Ivory Tower
Interfaces, Classes, & Abstract Classes

Remember from last week that "Classes" are blueprints
- They are a collection of Methods, variables, properties and events
- Classes DO NOT EXIST until they are created (i.e. the difference between having a blueprint and the building built from those blueprints)
- When an instance of a class is "created" -- and "object" is born

Declaring a Class
public class C101

{

//Fields, methods, properties, events
// everything in the "blue print" goes in here

}

Creating an OBJECT of a class:
C101 object1 = new C101();

** One of the topics that was covered towards the end of our "Code Warrior" section last week, was the idea of inheritance.
-- You can make new classes that inherit their members from another class, with derrivations from the original class.

Inheriting from a class
public class Module4 : C101

{

//Fields, methods, properties, events
//everything in the ""blue print"" goes in here

}

** However, there's another way to do that... another way that perhaps is MORE suited for inheritance and derrivation than a class... an ABSTRACT CLASS

Now let's talk about "Abstract Classes"
* If classes are blueprints --- things that are ready to create --- to turn into objects, then "ABSTRACT Classes" are architectural designs.
-- They have the right shape of the thing to be created
-- They have much of the information needed to create the thing being created
-- But they are not complete
-- They cannot be instantiated - (They cannot not be "created" into an object)

* The sole purpose of an abstract class is to act as a "base" for inheritance
-- They cannot be instantiated, but a derrivative class, which inherits the abstract members from the abstract class, can be.
-- That derrivative class must provide proper implementation for all the abstract members of the abstract class, then it CAN create an object. (It complete's the blueprints)

Declaring an abstract class
public abstract class C101

{

//Fields, methods, properties, events
//everything in the ""blue print goes in here

public abstract void menu()

{

}

}

Inheriting from an abstract class
public class Module4 : C101

{

public void menu()

{

Console.WriteLine("This is a Menu");

}

}

* The inherited class from C101 MUST provide implementation for any abstract members within that class.

A few things about Abstract Classes:
1. They are created with the keyword "abstract"
2. They are incomplete and therefore CANNOT be instantiated. (an object cannot be created from the class)
3. Abstract classes and incomplete, and therefore can only be used as a base class
4. Non-abstract classes that are derived from abstract classes MUST provide proper implementation for any abstract members that are inherited from the abstract class.

Why have an Abstract Class?
* Abstract classes ENFORCE a particular hierarchy - They FORCE those who are inheriting from the class to code in a particular way to complete implementation.
* Abstract classes give us "parent" classes from which we can derive objects with customized implementation
* Going back to the blueprint:
-- An abstract class can give us the overview of what an object should look like, but then each derrivative class can implement the pieces of the abstract class as then need to be to best suit function

Let's talk about an Interface
* An Interface is like an Abstract class in that it can be used to define hierarchies for any sub-classes
* Unlike an Abstract Class, an Interface has NO body.
-- It's just the definitions of methods, with no body whatsoever.

Get in Touch With Us!

* Subscribe and get Coding 101 automatically at TWiT.tv!
* Follow PadreSJ and Snubs on Twitter.
* Watch the show live and join the chatroom every Thursday at 1:30pm PST.
* Email us at Padre@twit.tv and Shannon@twit.tv.
* Join our Google+ Community!
* Check out our transcripts.