data abstraction Comparison Table

Object Oriented Software Engineering View all facts Glossary Help

subject > representation > abstraction > data abstraction

Next abstraction: pipe Up: abstraction Previous abstraction: collaboration

data abstraction comparison table

Subject add to access through is an instance of declare implement in is a subtopic of name after create see also use in refer to provide has part create using represent connect contain have purpose exist if identify by have example have type have scope confuse with implement using need in is a kind of show implement as have default name draw as have has definition describe be divide up into

association a model unless it is relevant to the application - it will be needed to implement some requirement several ways in Java 5.3 - Associations and Multiplicity role name all the links between two classes that may ever exist a class possesses, controls, is connected to, is related to, is a part of, has as parts, is a member of, or has as members, some class in your model class Person in a business application might have the following relationships supervisor (association to class Manager) and tasksToDo (association to class Task) instance variables in Java: you divide each two-way association into two one-way associations - so each associated class has an instance variable data abstraction how two classes are related to each other "has" if it has neither an association name nor a role name a line, or set of connected lines, between two classes in a UML class diagram sufficient names to make the association clear and unambiguous A relationship between two classes that represents the existence of a set of links between objects of the two classes a relationship that will exist between instances at run time legitimate only if its links will survive beyond the execution of any particular operation

attribute a model unless it is relevant to the application - it will be needed to implement some requirement public methods so that attributes are only given valid values and so that you can change the internal design of the class without affecting how users of the class interact with it 9.2 - Principles Leading to Good Design the analysis and design stage before it is known how the attribute will be implemented a particular object, several different objects during the execution of a program, or no object at all a variable number of things different classes of objects depending on the type of the variable looking at the description of the system and searching for information that must be maintained about each class variable an instance variable in Java an implicit internal structure A simple data item present in all the instances of a class private

class a list of variables, called instance variables, corresponding to data that will be present in each instance 9.2 - Principles Leading to Good Design the internals of a computer system such as 'Record', 'Table', 'Data', 'Structure', or 'Information' to hold a responsibility if the responsibility cannot be attributed to any of the existing classes class^2 variables several similar objects data associated with each object a domain model if you have to store or manipulate instances of it in order to implement a requirement programming language construct a box with the name of the class inside in a UML class diagram a comment at the top describing the purpose of the class, how it should be used, its authors and its history of modification A software module that provides both procedural and data abstraction. It describes a set of similar objects, called its instances the unit of data abstraction in an object-oriented program methods

data type The Basics of Java programming language construct

interface 2.7 - Concepts that Define Object Orientation interface^3 many of the same benefits as multiple inheritance superclasses containing only abstract methods in some languages to specify a set of methods that a variety of different classes can implement polymorphically generalizations the implements keyword in Java data abstraction a can-be-seen-as relation between the implementing class and the interface a small circle (like a lollipop), labelled with the name of the interface or as a class rectangle, with the expression Ťinterfaceť at the top, and (optionally) a list of supported operations in a UML diagram any concrete methods or instance variables a portion of the visible behaviour of a set of objects like a class except that it does not have any executable statements - it only contains abstract methods and class variables

link a model unless it is relevant to the application - it will be needed to implement some requirement association several ways in Java 5.3 - Associations and Multiplicity role name all the links between two classes that may ever exist two objects - an instance of each of the two classes involved in the association a class possesses, controls, is connected to, is related to, is a part of, has as parts, is a member of, or has as members, some class in your model class Person in a business application might have the following relationships supervisor (association to class Manager) and tasksToDo (association to class Task) instance variables in Java: you divide each two-way association into two one-way associations - so each associated class has an instance variable data abstraction how two classes are related to each other "has" if it has neither an association name nor a role name a line connecting two objects in a UML instance diagram multiplicity symbols A reference from one object to another a relationship that will exist between instances at run time legitimate only if its links will survive beyond the execution of any particular operation

record 2.1 - What is Object Orientation? data abstraction

structure 2.1 - What is Object Orientation? data abstraction

Next abstraction: pipe Up: abstraction Previous abstraction: collaboration

Subject	add to	access through	is an instance of	declare	implement in	is a subtopic of	name after	create	see also	use in	refer to	provide	has part	create using	represent	connect	contain	have purpose	exist if	identify by	have example	have type	have scope	confuse with	implement using	need in	is a kind of	show	implement as	have default name	draw as	have	has definition	describe	be	divide up into
association	a model unless it is relevant to the application - it will be needed to implement some requirement				several ways in Java	5.3 - Associations and Multiplicity							role name		all the links between two classes that may ever exist				a class possesses, controls, is connected to, is related to, is a part of, has as parts, is a member of, or has as members, some class in your model		class Person in a business application might have the following relationships supervisor (association to class Manager) and tasksToDo (association to class Task)				instance variables in Java: you divide each two-way association into two one-way associations - so each associated class has an instance variable		data abstraction	how two classes are related to each other		"has" if it has neither an association name nor a role name	a line, or set of connected lines, between two classes in a UML class diagram	sufficient names to make the association clear and unambiguous	A relationship between two classes that represents the existence of a set of links between objects of the two classes	a relationship that will exist between instances at run time	legitimate only if its links will survive beyond the execution of any particular operation
attribute	a model unless it is relevant to the application - it will be needed to implement some requirement	public methods so that attributes are only given valid values and so that you can change the internal design of the class without affecting how users of the class interact with it				9.2 - Principles Leading to Good Design				the analysis and design stage before it is known how the attribute will be implemented	a particular object, several different objects during the execution of a program, or no object at all				a variable number of things		different classes of objects depending on the type of the variable			looking at the description of the system and searching for information that must be maintained about each class							variable		an instance variable in Java			an implicit internal structure	A simple data item present in all the instances of a class		private
class				a list of variables, called instance variables, corresponding to data that will be present in each instance		9.2 - Principles Leading to Good Design	the internals of a computer system such as 'Record', 'Table', 'Data', 'Structure', or 'Information'	to hold a responsibility if the responsibility cannot be attributed to any of the existing classes	class^2				variables		several similar objects		data associated with each object									a domain model if you have to store or manipulate instances of it in order to implement a requirement	programming language construct				a box with the name of the class inside in a UML class diagram	a comment at the top describing the purpose of the class, how it should be used, its authors and its history of modification	A software module that provides both procedural and data abstraction. It describes a set of similar objects, called its instances		the unit of data abstraction in an object-oriented program	methods
data type						The Basics of Java																					programming language construct
interface						2.7 - Concepts that Define Object Orientation			interface^3			many of the same benefits as multiple inheritance		superclasses containing only abstract methods in some languages				to specify a set of methods that a variety of different classes can implement polymorphically						generalizations	the implements keyword in Java		data abstraction	a can-be-seen-as relation between the implementing class and the interface			a small circle (like a lollipop), labelled with the name of the interface or as a class rectangle, with the expression Ťinterfaceť at the top, and (optionally) a list of supported operations in a UML diagram	any concrete methods or instance variables		a portion of the visible behaviour of a set of objects	like a class except that it does not have any executable statements - it only contains abstract methods and class variables
link	a model unless it is relevant to the application - it will be needed to implement some requirement		association		several ways in Java	5.3 - Associations and Multiplicity							role name		all the links between two classes that may ever exist	two objects - an instance of each of the two classes involved in the association			a class possesses, controls, is connected to, is related to, is a part of, has as parts, is a member of, or has as members, some class in your model		class Person in a business application might have the following relationships supervisor (association to class Manager) and tasksToDo (association to class Task)				instance variables in Java: you divide each two-way association into two one-way associations - so each associated class has an instance variable		data abstraction	how two classes are related to each other		"has" if it has neither an association name nor a role name	a line connecting two objects in a UML instance diagram	multiplicity symbols	A reference from one object to another	a relationship that will exist between instances at run time	legitimate only if its links will survive beyond the execution of any particular operation
record						2.1 - What is Object Orientation?																					data abstraction
structure						2.1 - What is Object Orientation?																					data abstraction