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what are event and its typesan event is an occurrence at a point in time like user depresses left buttonevent happens instantaneously with regard to
what are packagespackage is a group of elements classes generalizations associations and lesser packages with a common theme package partitions a
what is reificationit is the promotion of something that is not an object into an objecthelpful method for meta applications it shifts the level of
what are several issues for selecting best workarounds in multiple inheritancessome restrictions methods are used use two approaches of delegations
what is metadatametadata is data that explains another dataclass definition is metadata models are inherently metadata as they explain the things
what is visibility give uml notationvisibility refers to the ability of a process to reference a feature from another class and has possible valued
what is overridingoverriding is an inherent part of association it can show an ordered set of objects by writing ordered next to the appropriate
what are bags and sequencesa bag is a collection of elements with duplicates permitted a sequence is an ordered collection of elements with
what is multiplicitymultiplicity is applied to attributes for data base application multiplicity for an attribute specifies the number of possible
what are qualified associationsa qualified association is an association in which an attribute known as the qualifier disambiguates the object many
what are links and associationslink is a physical or conceptual connection between objects a link is an instance of an association association is
what is inheritanceinheritance is the method of deriving a feature of super class into sub class every sub class inherits the attributes operations
what is generalizationgeneralization is a relationship among a class super class and one or more variations of the class sub classesit arrange
what is class class diagraman object is an instance of a class class explains a group of objects with similar properties attributes behaviour
what are kinds of modelsclass model - objects in the system and their relationshipsstate model - life history of the objectsinteraction model -
what is oo developmentoo development is a way of thinking about software based on abstractions that exist in the actual world development refers to
what is object orientationobject orientation means that we classify software as a collection of discrete objects that incorporate with together ds
define the terms i key attribute ii value set key attribute an entity type usually has an
define null values in some cases a particular entity might not have an applicable value for an attribute or if we do not know the value of an
what are stored and derived attributes stored attributes the attributes kept in a data base are called stored attributes derived attributes the
define data model a data model is a collection of conceptual tools for explaning data data relationships data semantics and consistency
explain the halting problemgiven a computer program and an input to it verify whether the program will halt on that input or continue working
explain class p problemsclass p is a class of decision problems that can be solved in polynomial
explain the theory of computational complexity a problems intractability remains the similar for all principal
define tractable and intractable problemsproblems that can be solved in polynomial time are known as tractable problems problems that cannot be