Podcast
Questions and Answers
Which type of object is primarily responsible for managing interactions between a system and the external world?
Which type of object is primarily responsible for managing interactions between a system and the external world?
In UML diagrams, what symbol indicates that an attribute or operation has protected visibility?
In UML diagrams, what symbol indicates that an attribute or operation has protected visibility?
Which of the following relationships is best described as a 'has-a' relationship?
Which of the following relationships is best described as a 'has-a' relationship?
Which design pattern aims to simplify a complex subsystem by providing a higher-level interface?
Which design pattern aims to simplify a complex subsystem by providing a higher-level interface?
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If Date dates[size]
is a statically allocated array of Date objects and dates
is an object of type Date
, how would you call the print()
method on the first element?
If Date dates[size]
is a statically allocated array of Date objects and dates
is an object of type Date
, how would you call the print()
method on the first element?
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Study Notes
Object-Oriented Concepts
- Entity object: Represents real-world entities with minimal application logic (e.g., student, instructor).
- Control object: Manages program flow; doesn't hold much data (e.g., adding a class).
- Boundary object: Controls interactions between the system and the outside world (e.g., user interface).
- Collection object: Lists or arrays (e.g., a class list).
UML Diagrams
- UML diagrams include attributes and operations.
- Private attributes are prefixed with
for private
. - Protected attributes are prefixed with
# for protected
. - Public attributes are prefixed with
+ for public
. - Abstract class names should be italicized.
- Static members are underlined.
- Friendship relationships are not shown.
Relationships
- Composition ("has-a"): A strong relationship where the existence of one object depends on another. Example: A team has a score
-
scoreGoal()
is a method that returns void (doesn't return a value).
Collection Classes
- Collection classes often have constructors and destructors, along with getter and setter methods.
- These are not typically shown in UML diagrams.
- Inheritance is indicated by a triangle, not an arrow.
Object Attributes
- Object attributes are not listed individually; instead, the relationships between objects are shown.
Arrays
-
Static arrays: Fixed size (e.g.,
Date dates[size]
). -
Dynamic arrays: Variable size (e.g.,
Date\* dates = new Date[size]
).
Design Patterns
- Top-down inside out: A design approach.
- Facade: Simplifies complex classes into a simpler interface.
- Observer: Updates objects based on changes in other objects.
- Strategy: Defines various algorithms and lets objects choose which to use.
Design Categories
- Behaviour: Describes how objects interact.
- Architectural: Shows grouping of objects.
- Creational: Explains object creation mechanisms.
- Structural: Shows relationships between objects.
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Description
This quiz covers fundamental object-oriented concepts such as entity, control, boundary, and collection objects, along with the role of UML diagrams in modeling these concepts. It will test your understanding of relationships like composition and the notation used in UML for attributes and methods. Prepare to dive into the intricacies of object-oriented programming!