Design Principles and UML

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what is the goal of encapsulation

to keep software changes local

true or false: any file with import or export is a module

true

example of single point of control?

using a[CONST_SIZE] rather than a[100]

what is delegation in software

using composition to rely on a previously implemented behavior

what is composition in software

wiring ports together, handing roles over to other class

what is navigability

a property of associations meaning that from one object you can find the associated object

replacing a literal value that repeats often in your program with a constant is an example of what design principle

abstraction

What are the four principles of software design

abstraction, encapsulation, modularity, and hierarchy

what is the purpose of an interface

an interface in input position is a filter on the wire, like writing, an interface in output position serves as a checker to make sure that an object is

what is the liskov substitution principle

an object of a subclass should always be substitutable for an object of the super class

how is composition represented in UML

black diamond

what are steps of felleisens 1-2-3 rule

1 is an exception, 2 is a coincidence, 3 could be a pattern, therefore a candidate for generalization

how is aggregation represented in UML

clear diamond

what is aggregation

has-a hierarchy, aggregating abstraction into whole

the two key principles of modularity:

high cohesion, and weak coupling

what is generalization

is-a hierarchy, generalizing across abstractions (ex Chevy is a FordModel )

what is abstraction

moving from a concrete object into a general principle that describes them

What is the principle of encapsulation

no part of a complex system should depend on internal details of another

what is multiplicity

number of components or activities (ex. one student, one transcript, many students, one professor)

what is the principle of modularity

partitioning a system such that parts can be designed and revised independently

what is an association relationship

simply means there is a link or dependency between them

what is it called when we use a constant to refer to a value that is used often in the program

single point of control

what is composition in uml

special case of aggregation where part cannot exist without the aggregate


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