Difference between revisions of "OOP Class7"

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−
[[Category:OOP]]
+
[[Category:IAM Classes]]
 +
[[OOP Arrays]]
  
−
==Visual Studio 2005==
+
==Review==
  
−
Pass out MSDNAA Visual Studio 2005 DVD
+
{{OOP Review Midterm}}
  
−
Visual Studio Demo
+
Cat app with multiple toys
 +
 
 +
Course App in console and windows
 +
 
 +
==Structs==
 +
 
 +
Lightweight alternatives to classes. Structs do not support inheritance or destructors. Don't worry if you don't understand structs yet it hard cuz the book teaches them before classes. We will talk more about stucts after we talk about classes
 +
Syntax
 +
 
 +
[ attributes] [access-modifiers] struct identifier
 +
[:interface-list {struct members}
 +
 
 +
<syntaxhighlight lang="csharp">struct Dog
 +
{
 +
public string name;
 +
public string weight;
 +
public int age;
 +
}</syntaxhighlight>
 +
 
 +
==Enumerators==
 +
 
 +
Enumerators are used to set predefined list of named constants.
 +
Syntax
 +
 
 +
[ attributes] [modifiers] enum identifier
 +
[:base-type {enumerator-list};
 +
 
 +
<syntaxhighlight lang="csharp">//An enumerator for ServingSizes at BK
 +
enum ServingSizes : uint
 +
{
 +
  Small = 0,
 +
  Regular = 1,
 +
  Large = 2,
 +
  SuperSize = 3
 +
}</syntaxhighlight>
 +
 
 +
<syntaxhighlight lang="csharp">//another more useful example
 +
// forced sequence to start 
 +
// from 1 instead of 0 (default)
 +
enum Months
 +
  {
 +
    January = 1, February , March, April ,
 +
    May , June , July , August , Sept , Oct , Nov , Dec
 +
  }</syntaxhighlight>
 +
 
 +
Enumerator Example [http://iam.colum.edu/Poop/gbrowser.php?file=/classsource/class2/Enum.cs Enum.cs]
  
−
Demo of students diagram
 
  
 
==Fancy Arrays==
 
==Fancy Arrays==
Line 22: Line 67:
 
single dimension arrays
 
single dimension arrays
  
−
<csharp>string [] aryNames = new string[5];
+
<syntaxhighlight lang="csharp">string [] aryNames = new string[5];
 
  
 
  
−
aryNames [0] = "Feta";
+
aryNames [0] = "Feta";
−
aryNames [1] = "Colby";
+
aryNames [1] = "Colby";
−
aryNames [2] = "Gruyere";
+
aryNames [2] = "Gruyere";
−
aryNames [3] = "Edam";
+
aryNames [3] = "Edam";
−
aryNames [4] = "Colby";</csharp>
+
aryNames [4] = "Colby";</syntaxhighlight>
  
 
Arrays are actually objects and support various methods.
 
Arrays are actually objects and support various methods.
Line 38: Line 83:
 
* Reverse
 
* Reverse
 
* Sort
 
* Sort
−
 
  
 
GetValue
 
GetValue
  
−
<csharp>string s = aryNames.GetValue(1).ToString();</csharp>
+
<syntaxhighlight lang="csharp">string s = aryNames.GetValue(1).ToString();</syntaxhighlight>
 
:s="Colby"
 
:s="Colby"
  
 
IndexOf
 
IndexOf
  
−
 
+
<syntaxhighlight lang="csharp">int i =  Array.IndexOf(aryNames, "Colby");</syntaxhighlight>
−
<csharp>int i =  Array.IndexOf(aryNames, "Colby");</csharp>
 
 
:i=1
 
:i=1
  
 
LastIndexOf
 
LastIndexOf
  
−
<csharp>int Lasti= Array.LastIndexOf(aryNames, "Colby");</csharp>
+
<syntaxhighlight lang="csharp">int Lasti= Array.LastIndexOf(aryNames, "Colby");</syntaxhighlight>
 
:Lasti=4
 
:Lasti=4
  
 
SetValue
 
SetValue
−
<csharp>
+
<syntaxhighlight lang="csharp">
 
     aryNames.SetValue("Gouda", 1);
 
     aryNames.SetValue("Gouda", 1);
−
     string setValue = aryNames.GetValue(1).ToString();</csharp>
+
     string setValue = aryNames.GetValue(1).ToString();</syntaxhighlight>
 
Now Array(1) == "Gouda"
 
Now Array(1) == "Gouda"
  
 
Reverse
 
Reverse
 
:Reverse reverses the array
 
:Reverse reverses the array
−
<csharp>Array.Reverse(aryNames);</csharp>
+
<syntaxhighlight lang="csharp">Array.Reverse(aryNames);</syntaxhighlight>
 
 
 
 
 
The Reversed array looks like Reverse
 
The Reversed array looks like Reverse
Line 78: Line 121:
 
:The Sort method sort the array. Arrays are sorted accourding to how objects compare to each other usually implemented using the IComparer interface
 
:The Sort method sort the array. Arrays are sorted accourding to how objects compare to each other usually implemented using the IComparer interface
 
   
 
   
−
<csharp>Array.Sort(aryNames);</csharp>
+
<syntaxhighlight lang="csharp">Array.Sort(aryNames);</syntaxhighlight>
 
 
 
 
 
The Sorted Array List Looks like
 
The Sorted Array List Looks like
Line 109: Line 152:
 
types of collections
 
types of collections
  
−
    * set - no index
+
* set - no index
−
    * list - has index
+
* list - has index
−
    * map - has key/value pair
+
* map - has key/value pair
  
 
Set is like storing a bunch of objects in a bag. The order they are removed from the bag has nothing to do with the order they are removed. Set collections do not have a unique identifier.
 
Set is like storing a bunch of objects in a bag. The order they are removed from the bag has nothing to do with the order they are removed. Set collections do not have a unique identifier.
Line 119: Line 162:
 
Map types also have an index but it is not necessarily an integer. It could be anything unique.
 
Map types also have an index but it is not necessarily an integer. It could be anything unique.
  
−
===ArrayList===
+
===List===
−
The Array List of now part of System.Collections. In order to user it you must add a using statement
+
The List of now part of System.Collections. In order to user it you must add a using statement
−
<csharp>using System.Collections;</csharp>
+
<syntaxhighlight lang="csharp">using System.Collections.Generic;</syntaxhighlight>
  
 
create an arraylist
 
create an arraylist
  
−
<csharp>ArrayList myArrayList =  new ArrayList();</csharp>
+
<syntaxhighlight lang="csharp">List<String> myList =  new List<String>();</syntaxhighlight>
  
 
add and element or two
 
add and element or two
−
<csharp>
+
<syntaxhighlight lang="csharp">
−
myArrayList.Add("Feta");
+
myList.Add("Feta");
−
myArrayList.Add("Colby");
+
myList.Add("Colby");
−
myArrayList.Add("Gruyere");
+
myList.Add("Gruyere");
−
myArrayList.Add("Edam");
+
myList.Add("Edam");
−
myArrayList.Add("Colby");
+
myList.Add("Colby");
−
</csharp>
+
</syntaxhighlight>
−
This produces and Array list like
+
This produces and List like
 
<pre>
 
<pre>
 
Feta
 
Feta
Line 146: Line 189:
 
Insert an element
 
Insert an element
  
−
<csharp>myArrayList.Insert(1,"Gouda");</csharp>
+
<syntaxhighlight lang="csharp">myList.Insert(1,"Gouda");</syntaxhighlight>
 
 
 
 
 
Now our ArrayList Looks like
 
Now our ArrayList Looks like
Line 160: Line 203:
 
Remove an element
 
Remove an element
  
−
<csharp>//remove by index
+
<syntaxhighlight lang="csharp">//remove by index
−
myArrayList.RemoveAt(1);
+
myList.RemoveAt(1);
 
//remove by data
 
//remove by data
−
myArrayList.Remove("Colby"); //removes first occurance of Colby
+
myList.Remove("Colby"); //removes first occurance of Colby
−
</csharp>  
+
</syntaxhighlight>  
  
−
Now our Array List looks like
+
Now our List looks like
 
<pre>
 
<pre>
 
Feta
 
Feta
Line 173: Line 216:
 
Colby</pre>
 
Colby</pre>
  
−
Pros and con of ArrayList
+
Pros and con of Generic Lists
 
Pros
 
Pros
−
 
 
* No fixed size
 
* No fixed size
 
* Insert and Remove
 
* Insert and Remove
  
 
Cons
 
Cons
−
 
 
* Slower than arrays
 
* Slower than arrays
 
* Inefficient with memory (when the array size exceeds the upper bound .NET doubles the size of the array.
 
* Inefficient with memory (when the array size exceeds the upper bound .NET doubles the size of the array.
Line 193: Line 234:
 
foreach
 
foreach
  
−
<csharp>foreach (string n in aryNames)
+
<syntaxhighlight lang="csharp">foreach (string n in aryNames)
 
{
 
{
 
  aryDropDown.Items.Add(n);
 
  aryDropDown.Items.Add(n);
−
}</csharp>
+
}</syntaxhighlight>
 +
 
 +
==Pair Programming==
 +
 
 +
[http://www.extremeprogramming.org/rules/pair.html Pair Programming]
 +
 
 +
We are going to pair off to do our next assignment. Many of the paired programming principles come from XP (http://www.extremeprogramming.org/ Extreeme Progamming)
 +
 
 +
Pairs are good because
 +
*Pairs keep each other on track
 +
*A partner can help when you are stuck
 +
*Keep each other accountable
 +
 
 +
 
 +
Some XP Principles
 +
 
 +
Fail - If you are having trouble succeeding fail.
  
 +
Baby Steps - Do the smallest thing that you possible can that moves you in the right direction
  
 +
Integrate and communicate your code often. Try posting up your code and emailing or plan on meeting several times.
  
−
==Motorvehicle Diagram==
+
When two pair programmers are together one you should sit a one computer (yeah that right two of you at one computer) and one should type while the other watches and reflects. Feel free to slide the keyboard back and forth when someone get tired, stuck or has a new idea.
  
−
[[Oop Motorvehicle Diagram]]
+
I would like you and your paired partner to create and demonstrate classes in c# from the diagram below.
  
 
==Home Work==
 
==Home Work==
  
−
Build and Demonstrate The classes in the Motorvehicle Diagram in VS2005.
 
  
−
Read Handout on Inhertance and Polymorphism
+
 
 +
Practice for Medterm Exam [[OOP Students Classes Diagram]]
 +
 
 +
If you need to add any supporting methods or properties that are not on the diagram feel free.
 +
 
 +
 
 +
<pre>
 +
CourseName:Object Oriented Programming CoureseNumber:36-2600
 +
Hello my name is Jeff Meyers my ID is 47167
 +
I'm teaching:
 +
CourseName:Object Oriented Programming CoureseNumber:36-2600
 +
Hello my name is Sean  my ID is 666
 +
I'm taking:
 +
CourseName:Object Oriented Programming CoureseNumber:36-2600
 +
CourseName:Writing and Retoric CoureseNumber:42-1000
 +
ConsoleApplicationExtreemeCourse.Pencil is sharp
 +
ConsoleApplicationExtreemeCourse.Pencil is not sharp
 +
</pre>

Latest revision as of 16:30, 10 June 2019

OOP Arrays

Review

  • OOP Class1 Introduction to .NET and C#
    • Compliled vs Interpreted Languages
  • OOP Class2 C# fundamentals
    • Basic Data Types
    • Operators
    • Conversion Casting
    • Constants
    • Arrays
      • Single Arrays
      • Multi Dimensianal Arrays
      • Jagged Arrays
      • Enumerators
  • OOP Class3 CSharp Control Structures
    • Operators
    • Branching Statements
      • Branching
        • If
        • Switch
      • Looping
        • for
        • foreach
        • do
        • while
  • OOP Class4 Classes and Objects
    • Encapsulation
    • Classes
      • Fields
      • Methods
      • Constuctor
    • Overloading
  • OOP Class5 Object Relationships
    • Access Modifiers
    • Accessors
    • Static Members
    • Relationships
      • Association 'Uses a'
      • Containment 'Has a'
      • Inhertance 'Is a'
  • OOP Class6 Object Relation Ships 2 / UML
    • UML
    • Inheritance 'Is A'
    • Virual Functions Override
    • Polymorphism
    • Structs
  • OOP Class7 Polymorphism / Visual Studio 2005
    • Fancy Arrays
    • Colections
    • Polymorphism

Cat app with multiple toys

Course App in console and windows

Structs

Lightweight alternatives to classes. Structs do not support inheritance or destructors. Don't worry if you don't understand structs yet it hard cuz the book teaches them before classes. We will talk more about stucts after we talk about classes Syntax

[ attributes] [access-modifiers] struct identifier [:interface-list {struct members} 

struct Dog
{
 public string name;
 public string weight;
 public int age;
}

Enumerators

Enumerators are used to set predefined list of named constants. Syntax

[ attributes] [modifiers] enum identifier [:base-type {enumerator-list}; 

//An enumerator for ServingSizes at BK
enum ServingSizes : uint
{
  Small = 0,
  Regular = 1,
  Large = 2,
  SuperSize = 3
}

//another more useful example
// forced sequence to start  
// from 1 instead of 0 (default)
enum Months 
  {
    January = 1, February , March, April ,
    May , June , July , August , Sept , Oct , Nov , Dec 
  }

Enumerator Example Enum.cs


Fancy Arrays

Arrays

Regular Array objects are like list collections

Arrays are groups of variables of the same type

Syntax
        type [] identifier

single dimension arrays 

string [] aryNames = new string[5];
  		
aryNames [0] = "Feta";
aryNames [1] = "Colby";
aryNames [2] = "Gruyere";
aryNames [3] = "Edam";
aryNames [4] = "Colby";

Arrays are actually objects and support various methods.

  • GetValue
  • IndexOf
  • LastIndexOf
  • SetValue
  • Reverse
  • Sort

GetValue 

string s = aryNames.GetValue(1).ToString();
s="Colby"

IndexOf 

int i =  Array.IndexOf(aryNames, "Colby");
i=1

LastIndexOf 

int Lasti= Array.LastIndexOf(aryNames, "Colby");
Lasti=4

SetValue 

    aryNames.SetValue("Gouda", 1);
    string setValue = aryNames.GetValue(1).ToString();

Now Array(1) == "Gouda"

Reverse

Reverse reverses the array
Array.Reverse(aryNames);

The Reversed array looks like Reverse 

0 Colby
1 Edam
2 Gruyere
3 Gouda
4 Feta

Sort

The Sort method sort the array. Arrays are sorted accourding to how objects compare to each other usually implemented using the IComparer interface
Array.Sort(aryNames);

The Sorted Array List Looks like 

0 Colby
1 Edam
2 Feta
3 Gouda
4 Gruyere

Array Example 2

Array2.cs

Pros and Cons of working with arrays pros

  • East to use
  • Fast to alter
  • Flast to iterate though
  • Specific type of elements ( single type)

cons

  • Fixed size
  • Insterting is difficult

Collections

Collections are groups of objects. types of collections

  • set - no index
  • list - has index
  • map - has key/value pair

Set is like storing a bunch of objects in a bag. The order they are removed from the bag has nothing to do with the order they are removed. Set collections do not have a unique identifier.

List types of collections have an integer for an indexer. This gives them a unique identifier and an order.

Map types also have an index but it is not necessarily an integer. It could be anything unique.

List

The List of now part of System.Collections. In order to user it you must add a using statement 

using System.Collections.Generic;

create an arraylist 

List<String> myList =  new List<String>();

add and element or two 

myList.Add("Feta");
myList.Add("Colby");
myList.Add("Gruyere");
myList.Add("Edam");
myList.Add("Colby");

This produces and List like 

Feta
Colby
Gruyere
Edam
Colby

Insert an element 

myList.Insert(1,"Gouda");

Now our ArrayList Looks like 

Feta
Gouda
Colby
Gruyere
Edam
Colby

Remove an element 

//remove by index
myList.RemoveAt(1);
//remove by data
myList.Remove("Colby");		//removes first occurance of Colby

Now our List looks like 

Feta
Gruyere
Edam
Colby

Pros and con of Generic Lists Pros

  • No fixed size
  • Insert and Remove

Cons

  • Slower than arrays
  • Inefficient with memory (when the array size exceeds the upper bound .NET doubles the size of the array.

ArrayList Example

ArrayList.cs

Polymorphism

Arrays and Collections of objects allow for polymorphism.

foreach 

foreach (string n in aryNames)
{
 aryDropDown.Items.Add(n);
}

Pair Programming

Pair Programming

We are going to pair off to do our next assignment. Many of the paired programming principles come from XP (http://www.extremeprogramming.org/ Extreeme Progamming)

Pairs are good because

  • Pairs keep each other on track
  • A partner can help when you are stuck
  • Keep each other accountable


Some XP Principles

Fail - If you are having trouble succeeding fail.

Baby Steps - Do the smallest thing that you possible can that moves you in the right direction

Integrate and communicate your code often. Try posting up your code and emailing or plan on meeting several times.

When two pair programmers are together one you should sit a one computer (yeah that right two of you at one computer) and one should type while the other watches and reflects. Feel free to slide the keyboard back and forth when someone get tired, stuck or has a new idea.

I would like you and your paired partner to create and demonstrate classes in c# from the diagram below.

Home Work

Practice for Medterm Exam OOP Students Classes Diagram

If you need to add any supporting methods or properties that are not on the diagram feel free. 


CourseName:Object Oriented Programming CoureseNumber:36-2600
Hello my name is Jeff Meyers my ID is 47167
I'm teaching:
CourseName:Object Oriented Programming CoureseNumber:36-2600
Hello my name is Sean  my ID is 666
I'm taking:
CourseName:Object Oriented Programming CoureseNumber:36-2600
CourseName:Writing and Retoric CoureseNumber:42-1000
ConsoleApplicationExtreemeCourse.Pencil is sharp
ConsoleApplicationExtreemeCourse.Pencil is not sharp
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