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physical part of a software system that encapsulates an implementation body (which fulfils a function) and provides a set of methods for implementing the interface.

Software reuse of a system consists of four processes: development, management, support and reuse of reusable assets (building blocks).

a component consists of a set of objects containing a collection of collaborative classes that work together to provide a system functionality

independent unit of software with reusable value. In the object-oriented approach,

deployment view and use case view.

the semantic rules that UML uses to describe things are named things, relations and diagrams respectively.

Public mechanisms are public UML methods for achieving specific goals and include four main types of specification (detailing), modification,

, the rules that govern how these building blocks are put together (the architecture) and a number of mechanisms that apply to the whole of UML.

The structure of UML consists of the basic building blocks

ts scope is not limited to supporting object-oriented analysis and design, but also supports the whole process of software development,

2) Unified Modelling Language Unified Modelling Language (UML)

Polymorphism: Polymorphism means that the same operation can be interpreted differently when applied to different objects,

Messages are the means of communication between objects

Encapsulation: The unit of encapsulation in an object-oriented system is the object

then class B is a generalisation of class A.