Difference between revisions of "OOP Class6"

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[[Category:OOP]]
+
[[Category:IAM Classes]]
  
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Real barking dogs...
+
==Review==
 +
;Accessibility: restrict the visibility of a class and it's members
 +
;Classes: Abstraction that has properties and methods. properties and the ''nouns'' and methods are the ''verbs''Classes are used to define objects.
 +
;Objects: Instance of a class
 +
;Abstraction : Factor out details to work on fewer concepts at a time
 +
;Encapsulation: Allows us to use objects with out completely understanding how everything inside the object works. Encapsulation also allows the internal state of objects to be changed easily without affecting other objects or interfaces. Real barking dogs...[http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class4/DogBark DogBark] an example of how you don't need to know how all of the classes work just how to use them
 +
;Polymorphism: many forms that have the same attributes and abilities
 +
;UML : Unified Modeling Language.
  
 +
TODO
 +
;Virtual Functions: Functions that can be overridden.
 +
;Static: Members that are associayed with a class not an instance of the class
  
−
[http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class4/DogBark DogBark]
 
−
 
−
an example of how you don't need to know how all of the classes work just how to use them
 
−
 
−
 
−
<!--
 
 
==Shared Members - static members==
 
==Shared Members - static members==
 
aka Shared Properties
 
aka Shared Properties
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Static - A type of member modifier that indicates that the member applies to the type rather than an instance of the type
 
Static - A type of member modifier that indicates that the member applies to the type rather than an instance of the type
  
−
<csharp>public class Dog
+
<syntaxhighlight lang="csharp">public class Dog
 
{
 
{
 
//some code
 
//some code
Line 33: Line 37:
 
//Add a dog to the total dog count
 
//Add a dog to the total dog count
 
dogCount++;
 
dogCount++;
−
}</csharp>
+
}</syntaxhighlight>
 
}
 
}
  
Line 41: Line 45:
  
  
−
-->
+
 
 +
 
 
==OverLoading==
 
==OverLoading==
  
Line 48: Line 53:
 
Simple Bark Method
 
Simple Bark Method
  
−
<csharp>
+
<syntaxhighlight lang="csharp">
 
public class Dog
 
public class Dog
 
{
 
{
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}
 
}
 
}
 
}
−
</csharp>
+
</syntaxhighlight>
  
 
overloaded method that makes a dog bark more than once.
 
overloaded method that makes a dog bark more than once.
  
−
<csharp>
+
<syntaxhighlight lang="csharp">
 
public class Dog
 
public class Dog
 
{
 
{
Line 102: Line 107:
 
}
 
}
 
}
 
}
−
</csharp>
+
</syntaxhighlight>
  
 
You can overload a method as much as you want as long as each overload has a '''unique argument signature'''
 
You can overload a method as much as you want as long as each overload has a '''unique argument signature'''
Line 113: Line 118:
 
here is a simple dog contructor
 
here is a simple dog contructor
  
−
<csharp>
+
<syntaxhighlight lang="csharp">
 
public class Dog
 
public class Dog
 
{
 
{
Line 125: Line 130:
 
   
 
   
 
}
 
}
−
</csharp>
+
</syntaxhighlight>
  
 
we can modify this so that we can pass in the sound of the dogs bark when the object is created
 
we can modify this so that we can pass in the sound of the dogs bark when the object is created
  
−
<csharp>
+
<syntaxhighlight lang="csharp">
 
public class Dog
 
public class Dog
 
{
 
{
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}
 
}
−
</csharp>
+
</syntaxhighlight>
  
 
or the name of the dog and the barksound
 
or the name of the dog and the barksound
  
  
−
<csharp>
+
<syntaxhighlight lang="csharp">
 
public class Dog
 
public class Dog
 
{
 
{
Line 161: Line 166:
 
   
 
   
 
}
 
}
−
</csharp>
+
</syntaxhighlight>
  
−
you can overload the contructor forever as long as each overload has a unique '''argument signature'''\
+
you can have as many overoads as you want as long as each overload has a unique '''argument signature'''
  
 
<!--
 
<!--
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     * Operator Overloading in C# - HowToDoThings.com
 
     * Operator Overloading in C# - HowToDoThings.com
  
−
<csharp>//Overloading unary operators
+
<syntaxhighlight lang="csharp">//Overloading unary operators
 
public static return_type operator op (Type t)
 
public static return_type operator op (Type t)
 
{
 
{
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//code to implement class addition
 
//code to implement class addition
 
return c;
 
return c;
−
}</csharp>
+
}</syntaxhighlight>
  
 
dog addition? extra credit
 
dog addition? extra credit
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===Operator Overloading Fraction Class===
 
===Operator Overloading Fraction Class===
  
−
<csharp>public static ClassType operator + ( object lhs, object rhs )
+
<syntaxhighlight lang="csharp">public static ClassType operator + ( object lhs, object rhs )
 
{
 
{
 
     ClassType c
 
     ClassType c
 
     //code to implement class addition
 
     //code to implement class addition
 
     return c;
 
     return c;
−
}</csharp>
+
}</syntaxhighlight>
  
 
Operator also refer to implicit and explicit conversions. Fractions make a good example for opertor overloading.
 
Operator also refer to implicit and explicit conversions. Fractions make a good example for opertor overloading.
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A dog uses a hydrant to relieve them self.
 
A dog uses a hydrant to relieve them self.
  
−
<csharp>//Dog simple class definition
+
<syntaxhighlight lang="csharp">//Dog simple class definition
 
public class Dog
 
public class Dog
 
{
 
{
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     }
 
     }
 
   }
 
   }
−
}</csharp>
+
}</syntaxhighlight>
  
 
Dog Association example
 
Dog Association example
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<csharp>Dog fido = new Dog("fido");
+
<syntaxhighlight lang="csharp">Dog fido = new Dog("fido");
−
fido.Owner = new Person("Sue");</csharp>
+
fido.Owner = new Person("Sue");</syntaxhighlight>
  
−
<csharp>//Dog simple class definition
+
<syntaxhighlight lang="csharp">//Dog simple class definition
 
public class Dog
 
public class Dog
 
{
 
{
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       Name = newName;
 
       Name = newName;
 
     }
 
     }
−
   }</csharp>
+
   }</syntaxhighlight>
  
  
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  and the this keyword
 
  and the this keyword
  
−
<csharp>//Accessor for private color allow color to be set and return color or 'dirty' + color
+
<syntaxhighlight lang="csharp">//Accessor for private color allow color to be set and return color or 'dirty' + color
 
     public string Color
 
     public string Color
 
     {
 
     {
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           color = value;
 
           color = value;
 
         }
 
         }
−
     }</csharp>
+
     }</syntaxhighlight>
  
 
console /infod/jeff/classSource/class4/dogAccessor.cs - source
 
console /infod/jeff/classSource/class4/dogAccessor.cs - source
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Dog private members, Overloaded with method class definition
 
Dog private members, Overloaded with method class definition
  
−
<csharp>//Dog private members, Overloaded  with method class definition
+
<syntaxhighlight lang="csharp">//Dog private members, Overloaded  with method class definition
 
public class Dog
 
public class Dog
 
{
 
{
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//put eat code here  
 
//put eat code here  
 
}
 
}
−
}</csharp>
+
}</syntaxhighlight>
  
 
console
 
console
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-->
 
-->
  
−
==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)
 
  
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Pairs are good because
 
−
*Pairs keep each other on track
 
−
*A partner can help when you are stuck
 
−
*Keep each other accountable
 
  
 +
==Association - 'Uses A'==
  
−
Some XP Principles
+
A dog uses a hydrant to relieve them self.
  
−
Fail - If you are having trouble succeeding fail.
+
<syntaxhighlight lang="csharp">//Dog simple class definition
 +
public class Dog
 +
{
 +
    //some dog code...
 +
   
 +
    public void Relieve(Hydrant h)
 +
    {
 +
    h.Clean = false;
 +
    }
 +
}   
  
−
Baby Steps - Do the smallest thing that you possible can that moves you in the right direction
+
public class Hydrant
 +
{
 +
  public string Color; //the color of the hydrant
 +
  public bool Clean;  //if the hydrant is clean or dirty
 +
 
 +
  public Hydrant()
 +
  {
 +
    Color = "red";
 +
    Clean = true;
 +
  }
 +
 
 +
  public override string ToString ()
 +
  {
 +
    if (this.Clean == true)
 +
    {
 +
    return ("The " + this.Color + " hydrant is clean.");
 +
    }
 +
    else
 +
    {
 +
    return ("The " + this.Color + " hydrant is not clean.");
 +
    }
 +
  }
 +
}</syntaxhighlight>
  
−
If you do decide to dive and conqure the problem please remember that integration process is unpredictable and can be quite difficult. Try to integrate your code often. Try posting up your code and emailing or plan on meeting several times.
+
Dog Association example
 +
[http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class5/DogHydrant.cs DogHydrant.cs] - source
 +
 
 +
==Containment - 'Has A'==
 +
A dog has an owner
 +
 
 +
 
 +
<syntaxhighlight lang="csharp">Dog fido = new Dog("fido");
 +
fido.Owner = new Person("Sue");</syntaxhighlight>
 +
 
 +
<syntaxhighlight lang="csharp">//Dog simple class definition
 +
public class Dog
 +
{
 +
    public string Name;        // the dog's name
 +
    public string BarkSound;    // the sound of the dog's bark
 +
    public Person Owner;    // the dogs owner
 +
   
 +
    public Dog(string dogName)
 +
    {
 +
        Name = dogName;
 +
        BarkSound = "Woof!!!";
 +
    }
  
−
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.
+
    public string Bark() {
 +
        string s;
 +
        s = this.Name + " says " + this.BarkSound;
 +
        //Make sure the the dog has an owner
 +
        if (!(this.Owner == null))
 +
          s += "\n" + Owner.Name + " says be quiet.";
 +
        return s;
 +
    }
 +
}   
  
−
I would like you and your paired partner to create and demonstate classes in c# from the diagram below.
+
public class Person
 +
  {
 +
    public string Name;      //the color of the hydrant
 +
   
 +
    public Person(string newName)
 +
    {
 +
      Name = newName;
 +
    }
 +
  }</syntaxhighlight>
  
  
 +
Containment example<br>
 +
[http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class5/DogOwner.cs DogOwner.cs] -source
  
 
==Homework==
 
==Homework==
Line 510: Line 579:
 
-->
 
-->
  
−
===READ===
+
 
 
<!--
 
<!--
−
Chapter 2 Introducin the UML in The Unified Modeling Language Users Guided (hand out)
+
Chapter 2 Introduction the UML in The Unified Modeling Language Users Guided (hand out)
  
 
Chapter 4 Classes in The Unified Modeling Language Users Guided (hand out)
 
Chapter 4 Classes in The Unified Modeling Language Users Guided (hand out)
 
-->
 
-->
 +
 +
*Create A Cat Containment and Association Project based off of the followong UML
 +
[[Image:CatConainmentAssociation.PNG]]
 +
 +
The Program should have output similar to
 +
<pre>
 +
Hello I am a CatContainmentAssociation.Cat I'm 10 years old and I weigh 0 My Meo
 +
w sounds like Meow!. punkin doesn't have a toy to play with
 +
Hello I am a CatContainmentAssociation.Cat I'm 10 years old and I weigh 0 My Meo
 +
w sounds like Meow!. punkin plays with SparkleyBall
 +
The Basement LitterBox is clean
 +
The Basement LitterBox is dirty
 +
The Basement LitterBox is clean
 +
</pre>
  
  
−
Finish you tv radio class and add overloads to you example class
+
*Create a fourth class the uses or is used by one of your other classes
−
quiz #2 next week
+
**Association
 +
*Create a fifth class the contains or is contained by one of your other classes
 +
**Containment
 +
**Create a UML diagram that show the relationships of your classes post export the diagram as a png (I'll show this in class) post diagram to demo fourth and fifth class

Latest revision as of 16:30, 10 June 2019


Review

Accessibility
restrict the visibility of a class and it's members
Classes
Abstraction that has properties and methods. properties and the nouns and methods are the verbsClasses are used to define objects.
Objects
Instance of a class
Abstraction 
Factor out details to work on fewer concepts at a time
Encapsulation
Allows us to use objects with out completely understanding how everything inside the object works. Encapsulation also allows the internal state of objects to be changed easily without affecting other objects or interfaces. Real barking dogs...DogBark an example of how you don't need to know how all of the classes work just how to use them
Polymorphism
many forms that have the same attributes and abilities
UML 
Unified Modeling Language.

TODO

Virtual Functions
Functions that can be overridden.
Static
Members that are associayed with a class not an instance of the class

Shared Members - static members

aka Shared Properties

Static - A type of member modifier that indicates that the member applies to the type rather than an instance of the type 

public class Dog
{
	//some code

	static private int dogCount;	// total number of dogs

	public Dog()
	{
		barkSound = "Woof!!!";
 		//Add a dog to the total dog count
		dogCount++;
	}
	public Dog(string newName)
	{
		name = newName;
		barkSound = "Woof!!!";
		//Add a dog to the total dog count
		dogCount++;
	}

}

Static dougCount Example
dogStatic.cs - source



OverLoading

You can overload a method to make it more flexible.

Simple Bark Method 

public class Dog
{
 	public string Name;		// the dog's name
	
	public string BarkSound;	// the sound of the dog's bark
	
	public Dog()
	{
		BarkSound = "Woof!!!";
	}
 
	public string Bark() { 
		string strBark = this.BarkSound;
                barkCount ++;
                return strBark;
	}
    
	public void Eat() {
		//put eat code here 
	}
}

overloaded method that makes a dog bark more than once. 

public class Dog
{
 	public string Name;		// the dog's name
	
	public string BarkSound;	// the sound of the dog's bark
	
	public Dog()
	{
		BarkSound = "Woof!!!";
	}
 
	public string Bark() { 
		string strBark = this.BarkSound;
                barkCount ++;
                return strBark;
	}
    
	public string Bark(int numBarks) { 
		string strBark = "";
                for(int i =0; i < numBarks; i++)  //bark many times
                {
                   strBark += this.BarkSound;
                   barkCount ++;
                }
                return strBark;
	}
}

You can overload a method as much as you want as long as each overload has a unique argument signature


Overload Constructor

Overloading the constructor of you class can make it easier to use.

here is a simple dog contructor 

public class Dog
{
 	
	public string BarkSound;	// the sound of the dog's bark
	
	public Dog()
	{
		BarkSound = "Woof!!!";
	}
 
}

we can modify this so that we can pass in the sound of the dogs bark when the object is created 

public class Dog
{
 	
	public string BarkSound;	// the sound of the dog's bark
	
	public Dog(string newBarkSound)
	{
		this.BarkSound = newBarkSound;
	}
 
}

or the name of the dog and the barksound 


public class Dog
{
 	
	public string BarkSound;	// the sound of the dog's bark
        public string Name;
	
	public Dog(string newBarkSound, string NewName)
	{
		this.BarkSound = newBarkSound;
                this.Name = newName;

	}
 
}

you can have as many overoads as you want as long as each overload has a unique argument signature




Association - 'Uses A'

A dog uses a hydrant to relieve them self. 

//Dog simple class definition
public class Dog
{
    //some dog code...
    
    public void Relieve(Hydrant h)
    {
     h.Clean = false;
    }
}    

public class Hydrant
{
  public string Color; //the color of the hydrant
  public bool Clean;   //if the hydrant is clean or dirty
  
  public Hydrant()
  {
    Color = "red";
    Clean = true;
  }
  
  public override string ToString ()
  {
    if (this.Clean == true)
    {
     return ("The " + this.Color + " hydrant is clean.");
    }
    else
    {
     return ("The " + this.Color + " hydrant is not clean.");
    }
  }
}

Dog Association example DogHydrant.cs - source

Containment - 'Has A'

A dog has an owner 


Dog fido = new Dog("fido");
fido.Owner = new Person("Sue");

//Dog simple class definition
public class Dog
{
    public string Name;        // the dog's name
    public string BarkSound;    // the sound of the dog's bark
    public Person Owner;    // the dogs owner
    
    public Dog(string dogName)
    {
        Name = dogName;
        BarkSound = "Woof!!!";
    }

    public string Bark() { 
        string s;
        s = this.Name + " says " + this.BarkSound;
        //Make sure the the dog has an owner
        if (!(this.Owner == null))
           s += "\n" + Owner.Name + " says be quiet.";
        return s;
    }
}    

public class Person
  {
    public string Name;      //the color of the hydrant
    
    public Person(string newName)
    {
      Name = newName;
    }
  }


Containment example
DogOwner.cs -source

Homework

  • Create A Cat Containment and Association Project based off of the followong UML

CatConainmentAssociation.PNG

The Program should have output similar to 

Hello I am a CatContainmentAssociation.Cat I'm 10 years old and I weigh 0 My Meo
w sounds like Meow!. punkin doesn't have a toy to play with
Hello I am a CatContainmentAssociation.Cat I'm 10 years old and I weigh 0 My Meo
w sounds like Meow!. punkin plays with SparkleyBall
The Basement LitterBox is clean
The Basement LitterBox is dirty
The Basement LitterBox is clean


  • Create a fourth class the uses or is used by one of your other classes
    • Association
  • Create a fifth class the contains or is contained by one of your other classes
    • Containment
    • Create a UML diagram that show the relationships of your classes post export the diagram as a png (I'll show this in class) post diagram to demo fourth and fifth class
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