Glossary (i-w)

Question 1

white-box reuse

Answer 1

A style of reuse based on class inheritance.

A subclass reuses the interface and implementation of
its parent class, but it may have access to otherwise private aspects of its parent.

Question 2

parameterized type

Answer 2

A type THAT LEAVES some constituent types unspecified.

The unspecified types are supplied as parameters at the point of use.

In C++, parameterized types are called templates.

Question 3

object composition

Answer 3

Assembling or composing objects to get more complex behavior.

Question 4

toolkit

Answer 4

A collection of classes that provides useful functionality but does not define the design of an application.

Question 5

object

Answer 5

A run-time entity that packages both data and the procedures that operate on that data.

Question 6

subtype

Answer 6

A type that contains an interface inherited from a supertype

Question 7

signature

Answer 7

An operation’s signature defines its name, parameters, and return value.

Question 8

operation

Answer 8

The procedure AN OBJECT PERFORMS when it receives a request.

Question 9

protocol

Answer 9

Extends the concept of an interface to include the allowable sequences of requests.

Question 10

subsystem

Answer 10

An independent group of classes that COLLABORATE TO FULFILL a set of responsibilities.

Question 11

polymorphism

Answer 11

The ability to substitute objects of matching interface for one another at run-time.

Question 12

supertype

Answer 12

The parent type from which a type inherits.

Question 13

interaction diagram

Answer 13

A diagram that shows the flow of requests between objects.

Question 14

handle

Answer 14

A value that identifies an object.

Question 15

reference

Answer 15

a variable that contains a handle

Question 16

overriding

Answer 16

Redefining an inherited operation in a subclass.

Question 17

interface

Answer 17

The set of ALL signatures defined by an object’s operations.

The interface DESCRIBES the set of requests to which an object can respond.

Question 18

type

Answer 18

The name of a particular interface.

Question 19

inheritance

Answer 19

A relationship that defines one entity in terms of another.

Interface inheritance defines a new interface in terms of one or more existing interfaces.

Implementation inheritance defines a new implementation in terms of one or more existing implementations.

Class inheritance combines interface inheritance and implementation inheritance.

Question 20

object diagram

Answer 20

A diagram that depicts a particular object structure at run-time.

Question 21

instance variable

Answer 21

A piece of data that defines part of an object’s representation.

C++ uses the term data member.

Question 22

receiver

Answer 22

The target object of a request.