Object Oriented Programming in Script/Object Oriented Terminology - Revision history

Andrew Branscom at 03:24, 6 December 2015

2015-12-06T03:24:08Z

Andrew Branscom at 06:15, 4 December 2015

2015-12-04T06:15:50Z

Andrew Branscom: Created page with "Official SCI Documentation

Chapter: 1 | Object Oriented Programming i..."

2015-12-04T05:28:00Z

Created page with "Official SCI Documentation<br /> <div align="center"> Chapter: 1 | Object Oriented Programming i..."

New page

[[Official SCI Documentation]]<br />

<div align="center">
Chapter:
[[Object Oriented Programming in Script/Object Oriented Programming|1]] |
[[Object Oriented Programming in Script/Object Oriented Terminology|2]] |
[[Object Oriented Programming in Script/Classes|3]] |
[[Object Oriented Programming in Script/Objects|4]] |
[[Object Oriented Programming in Script/Sending Messages|5]] |
[[Object Oriented Programming in Script/An Extended Example|6]] |
[[Object Oriented Programming in Script/Index|Index]]
</div><br />

<div align="center"><span style="font-size: 22pt">Object Oriented Terminology</span><br />
''Author: [[Jeff Stephenson]]''<br />
''Date: 4 April 1988''</div>

 

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[[Object Oriented Programming in Script | Table of Contents]]

 

<span style="float: left">[[Object Oriented Programming in Script/Object Oriented Programming|< Previous: Object Oriented Programming]]</span>
<span style="float: right">[[Object Oriented Programming in Script/Classes|Next: Classes >]]</span>

 

[[Category:SCI Documentation]]
[[Category:Scripting]]

@@ Line 21: / Line 21: @@
-===<br /> Property: ===
+===<br /> Property ===
 <blockquote>Properties are data associated with an object.  A door object might have such properties as the room number into which it opens, its state (open or closed), and its position on the screen.</blockquote>
-===<br /> Method: ===
+===<br /> Method ===
 <blockquote>A method is a procedure which is internal to an object or class.  A door object might have a method open which causes the door to change state from closed to open.</blockquote>
-===<br /> Message: ===
+===<br /> Message ===
 <blockquote>Methods of an object are invoked by sending the object messages.  In Script a message is sent to an object by enclosing the object name, then the message, in parenthesis (much like a procedure call):
@@ Line 37: / Line 37: @@
 </blockquote>
-===<br /> Selector: ===
+===<br /> Selector ===
 <blockquote>Selectors are used in messages to indicate the method which is to be invoked.  The symbol open: in the above example of messaging is the selector for the open method.</blockquote>
-===<br /> Object: ===
+===<br /> Object ===
 <blockquote>An object is a collection of properties and methods bundled together, and should be considered to be a distinct entity (hence the use of the word 'object').</blockquote>
-===<br /> Class: ===
+===<br /> Class ===
 <blockquote>A class is a 'generic' object of a certain type.  It has no real existence of its own, but provides the default methods and property values to those objects which are instances (see below) of it.  Classes may have sub-classes, which are more specific types of a class (for example, the class SlidingDoor is a sub-class of the class Door) and super-classes, which are generalizations of the class (the class Opening might be a super-class of the class Door).</blockquote>
-===<br /> Instance: ===
+===<br /> Instance ===
 <blockquote>An instance of a class is a 'concrete' object which has the properties and methods of the class, but whose properties are distinctly its own.  For example the object doorToCloset is an instance of the class Door which is different from the object doorToPatio, another instance of class Door.  Changing the property values of an instance (object) of a class will not affect the property values of other instances of the class.</blockquote>
-===<br /> Inheritance: ===
+===<br /> Inheritance ===
 <blockquote>Inheritance is one of the most important concepts in OOP, and is responsible for much of its power.  A sub-class inherits all the methods and properties of its super-class, then goes on to add its own distinct properties and methods, or to modify an inherited method from its super-class.  We might define the class ElevatorDoor as a sub- class of the class Door.  It would thus inherit the properties of Door but would add a property to tell whether the light associated with the door is on or off.  It would also inherit Door's methods, but would modify the open method to not only change the state of the ElevatorDoor to open, but also to change the state of the light property to on.  All other methods work just the same as for the Door class.</blockquote>
-===<br /> Self: ===
+===<br /> Self ===
 <blockquote>Often, an object needs to invoke one of its own methods, without really knowing who it is (it may be executing code inherited from its super- class).  This is done by sending a message to the object self, which is always the object which invoked the current method.</blockquote>
-===<br /> Super: ===
+===<br /> Super ===
 <blockquote>An important factor in using inheritance to define new methods is being able to get access to the super-class's code for a method within the newly defined method.  The class super is provided for this purpose -- sending a message to class super invokes the method within the super- class of self, rather than the method within self.  Thus, the open method for the class ElevatorDoor might contain the code

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+==<br /> Object Oriented Terminology ==
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Object Oriented Programming in Script/Object Oriented Terminology - Revision history

Andrew Branscom at 03:24, 6 December 2015

Andrew Branscom at 06:15, 4 December 2015

Andrew Branscom: Created page with "Official SCI Documentation Chapter: 1 | Object Oriented Programming i..."

Andrew Branscom: Created page with "Official SCI Documentation

Chapter: 1 | Object Oriented Programming i..."