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Object Oriented Programming & Design


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Abstract Class
A class that cannot be instantiated, but can be subclassed.
Abstract Method
A method with only a signature, and no implementation set.
Accessor
A method that returns a value of a hidden/private variable.
Action Listener
An interface used for handling action events (mouseclicks) etc.
Activation Bar in Sequence Diagrams
In a sequence diagram, this shows that the object is active
AGGREGATION
also know as "composition", ability to combine several objects into a new one
Agile Methodology
Adaptive approach to programming, responds to unpredictability and uses incremental, iterative work cadences.
Waterfall Methodology
A linear and sequential approach to programming, emphasis on deadline control (traditional and slower)
Association
A relationship that describes if a class "knows" or holds a reference to another class. "uses-a".
Awt
Abstract window toolkit- provides components for graphical user interfaces.
The anti-pattern; lacking perceivable architecture.
Big Ball of Mud (Design Pattern)
class diagram
A diagram used to represent data and their relationships in UML object notation.
Cohesion
A measure of how strongly-related or focused the responsibilities/methods of a single class are.
CRC
Class Responsibility Collaboration Card, a brainstorming tool.
Deadlock
A situation in which two or more competing actions are waiting for each other to finish, and thus neither does.
Dependency
A relationship where one class depends on the function of another to operate. "uses-a".
Design Patterns
A general reusable solution to a common problem within a given context in software design.
Don't Repeat Yourself
Principle of design, don't restate or reuse the same line of code; aimed at reducing repetition of information of all kinds.
Facade
Design pattern that teaches how to simplify a subsystem consisting of multiple classes by introducing a facade class that exposes all capabilities of the subsystem as methods
Factory Method
Method that constructs a new object.
Hash Table
A data structure in which elements are mapped to array positions according to their hash function values.
inheritance
designer, project manager & programmer are all based on and extend a person object
Iterator
Design pattern that teaches how to access the elements of an aggregate object.
Law of Demeter
Design guideline that states that a method should not operate on global objects or objects that are a part of another object.
Layout Manager
Class that arranges user interface components inside a container.
Lifeline
Vertical line below an object in a sequence diagram that indicates the time during which the object is alive.
Liskov substitution principle
derived methods should not assume more or deliver less
Lock
A data structure that ensures only one thread can execute a set of statements.
Listener
Object that is notified by an event source when an event occurs
Mutator
Method that changes the state of an object.
Oserver
Pattern hat teaches how an object can notify other objects about events.
Polymorphism
Allows many different objects to use a particular behaviour or method. At runtime a method can process data differently depending on the circumstances.
Race Condition
A condition in which the effect of multiple threads on shared data depends on the order in which the threads are scheduled.
Refactoring
A change to the system that leaves its behavior unchanged, but enhances some nonfunctional quality—simplicity, flexibility, understandability, performance.
Sequence Diagram
Diagram showing the sequence of messages between objects during a single use case
Singleton
Design pattern that teaches how to implement a class that has exactly one instance.
Subclass
class that inherits variables and methods from a superclass but adds instance variables, adds methods, or redefines methods.
Superclass
general class from which a more specialized class (subclass) inherits.
Synchronized method
A method that is controlled by a lock in order to execute the method, the calling thread must acquire the lock.
thread
A single task.
Total ordering
Ordering relationship in which all elements can be compared to each other.
UML
unified modeling language, notation for specifying visualizing constructing and documenting the artifacts of the software systems.
use case
description of possible sequences of interactions between a user and the system.
MVC Design Pattern
Separate input, UI, and back-end logic
Software Engineering
An engineering discipline that is concerned with all aspects of software production from the early stages of system specification through to maintaining the system after it has gone into use
Extreeeme
Focus on communication, simplicity, feedback, courage and respect.
Difference between Object and Class
Object is an instance of class, and class is a blueprint for object.
TCP
Transfer Communication Protocol - the protocol takes data from user's application and passes it to the Internet Protocol (IP).
URL
A location or address identifying where documents can be found on the Internet; a Web address
Swing
Primary GUI widget toolkit, better than awt, can emulate look and feel of several platforms.
port
a connection point on the chassis that connects something outside a computer case to the inside
DNS
Domain Name System
Partial Ordering
Not total ordering