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Questions and Answers

What is cohesion?

How closely the operations in a routine are related.

What is coupling?

The strength of a connection between 2 routines.

What is couping a complement to?

Cohesion

What does cohesion describe?

<p>How strongly the internal contents of a routine are related to each other.</p>

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What does coupling describe?

<p>How strongly a routine is related to other routines?</p>

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How should you aspire to apply coupling & cohesion to your designs?

<p>The goal is to create routines with internal integrity (strong cohesion) and small, direct, visible, and flexible relations to other routines (lose coupling).</p>

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Martin Fowler describes 3 different perspectives in the software development process? What are they?

<p>Conceptual, specification, and implementation.</p>

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Define the conceptual development perspective?

<p>This perspective "represents the concepts in the domain under study... a conceptual model should be drawn with little or no regard for the software that might implement it..."</p>

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Describe the specification development perspective.

<p>It looks at the software, but only its interfaces, not its implementation.</p>

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Describe the implementation development perspective.

<p>The code itself. This is probably the most often-used perspective, but in many ways, the specification perspective is often a better one to take.</p>

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What question does the conceptual perspective answer?

<p>What am I responsible for?</p>

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What question does the specification perspective answer?

<p>How am I used?</p>

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What question does the implementation perspective answer?

<p>How do I fulfill my responsibilities?</p>

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Define an object at the conceptual level.

<p>An object is a set of responsibilities.</p>

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Define an object at the specification level.

<p>An object is a set of methods (behaviors) that can be invoked by other objects or by itself.</p>

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Define an object at the implementation level.

<p>An object is code and data and computational interactions between them.</p>

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Define abstract class.

<p>Abstract classes define what a set of related classes can do.</p>

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Define classes.

<p>Classes define the type of object I have based on the responsibilities this object has. Responsibilities can be divided into behavior and/or state. These can be implemented using methods and/or data, respectively.</p>

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Define a concrete class

<p>A class that implements a particular type of behavior for an abstract class. Concrete classes are specific, nonchanging implementations of a concept.</p>

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Define encapsulation.

<p>Typically defined as data hiding, but better thought of as any kind of hiding (type, implementation, design, and so on).</p>

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Define inheritance.

<p>A class inherits from another class when it receives some or all of the qualities of that class. The starting class is called the base, super, parent, or generalized class, whereas the inheriting class is called the derived, sub, child, or specialized class.</p>

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Flashcards

Cohesion

How closely the operations in a routine are related.

Coupling

The strength of a connection between 2 routines.

Coupling complements what?

Cohesion

Cohesion Describes...

How strongly the internal contents of a routine are related to each other.

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Coupling Describes...

How strongly a routine is related to other routines.

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Design Goal: Coupling & Cohesion

Create routines with internal integrity (strong cohesion) and small, direct, visible, and flexible relations to other routines (loose coupling).

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Facade Pattern

Provide a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use.

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Adapter Pattern.

Converts the interface of a class into another interface that the clients expect. Adapter let's classes work together that could not otherwise because of incompatible interfaces.

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Strategy Pattern

Defines a family of algorithms, encapsulates each one, and makes them interchangeable. Strategy let's the algorithm vary independently from clients that use it.

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GOF's 3 principals to anticipate change.

Program to an interface. Favor object aggregation over class inheritance. Encapsulate the concept that varies.

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