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Schedule

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1408903200 The Tech Guy
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1408986000 Tech News Today
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Tuesday, August 26

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1409090400 Before You Buy
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1409097600 All About Android
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Wednesday, August 27

1409153400 FLOSS Weekly
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Thursday, August 28

1409245200 Tech News Today
1409248800 Know How...
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1409257800 Coding 101
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1409331600 Tech News Today
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1409353200 Tech News 2Night

Saturday, August 30

1409421600 The Tech Guy

Sunday, August 31

1409508000 The Tech Guy
1409522400 This Week in Tech

Monday, September 1

1409590800 Tech News Today
1409594400 Triangulation
1409599800 iPad Today
1409612400 Tech News 2Night
1409614200 Marketing Mavericks

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This Week in Law

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Tech News Today

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This Week in Computer Hardware

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Coding 101

The return of C#

Know How...

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Coding 101 31

C# Objects and Classes

August 21 2014

Hosts: Fr. Robert Ballecer, SJ and Shannon Morse

Snubs Compiled
Microsoft Visual Studio Express 13 Windows

MonoDeveloper OSX

Ivory Tower
Way back in Episode 6 of the first module of Coding 101, we talked a little about "Object Oriented Programming"
* OOP is an approach to programming that divides the process -- the "problem solving" of a program into modular, reusable pieces.

Before OOP, you wrote your program, then you considered how data might be processed by your code.
* In OOP, you don't think of data seperate from code -- instead, you think of "Objects" which combine code and data. --
** You wrote your code, which then processed data
** OOP unified the two: instead of having data and code, you have a "object" that combines the two.
** Instead of having pieces of code that handle sets of data, you now have OBJECTS that model In-Real-Life logic with In-Real-Life sets of data.

In other words... you code problem-solving, instead of process -- It was a huge jump.
*** Easier to Understand
*** Easier to Maintain
*** Easier to Upgrade

Now let's talk about CLASSES and OBJECTS
* Back in Module 1, we talked about coding functions or "methods"

For Example
"public int answer(int a, int b)
{

int c = a + b;
return c;

}"
** This will create a public function called "answer" that will accept two variables and return an integer value when called.
** We would call this function by writing:
answer(1,2)
** and it would return:
3

That function or "method" combines variables and code that processes those variables

A CLASS combines multiple "methods" and variables.
* A "class" is a blue print that can be created multiple times.
* When the blue print is used to create -- it creates an "OBJECT of that class
* We can create as many objects of a class, and when we're done with it, it's removed from memory.

IMPORTANT!!! --- Don't Interchange "Class" and "Object"
-- A Class is NOT an Object
-- A Class is the blueprint from which an Object is created.
-- A Class DEFINES an object, but it is not an object itself (Can I repeat the same thing more times?)
-- An OBJECT is NOT a class
-- An object is an INSTANCE of a class (based on that "blue print")
-- An object exists in memory ... a class does not (i.e. a class is not "real" until it is used to create an object of that class.)

Defining a Class is easy:
"public class C101
{
//Fields, methods, properties, events... everything in the ""blue print"" goes in here
}"

Creating an OBJECT of a class:
* We use the keyword "new" to create an instance of a class (aka an "object")
* In our example, we've created a class named "C101"
-- If we wanted to create an instance of that class (aka an "object") we would write:
***** "C101 object1 = new C101();"

This will create an instance of the class "C101" called "object1"
* The reason why we write "C101" twice is because we're
1. Creating an REFERENCE to an object, named "object1" that is based on the class "C101"
2. Then we're actually CREATING a "new" instance of the class "C101()" that can be referenced with "object1"

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