UML and Design Pattern

Unified Modeling Language
Unified Modeling Language referred as UML is a general-purpose modeling language standardized in the area of object-oriented software engineering. The standard is managed and created by the Object Management Group. In 1997, it was initially added to the list of OMG adopted technologies in 1997 and since become the industry standard for modeling software intensive systems.

UML includes a sub-set of graphic notation to create visual object-oriented models. The UML specify, modify, visualize, construct document the artefacts of an object-oriented software system under development. It also offers a standard mechanism to visualize a system's architecture blueprints and elements.

UML is different from the other popular programming languages like COBOL,C++, Java, etc. It is a a pictorial representation to design blue prints of software. In spite of the fact that UML is generally utilized to model software systems but is not limited within this boundary. It is also utilized to model non software systems such as flow of process in a manufacturing unit etc.

It is not a programming language but UML diagrams can be utilized to generate code in various languages. It has a straight relation with object oriented analysis and design. After adding some standardization, UML has become an Object Management Group (OMG) standard.

Design Pattern

Object oriented concepts were introduced much before than UML. During that time there were no standard methodologies to arrange and organize the object oriented development. At that instance of time, UML came into picture.

UML diagrams are not only designed for developers but also for common people , business users and anybody who wants to understand the system. It can be a non-software or software system. Thus it proves that UML is not a development method rather it attaches with processes to make a successful system.

The aim of UML can be defined as a simple modeling mechanism to model all potential practical systems in a complex environment.

The basic model is the first footprint before drawing a UML diagram. It facilitates user to understand the entities/entities in the real world and how they communicate with each other.

As UML distinguishes the real time systems, it is crucial to make a conceptual model and then move ahead gradually. Conceptual model of UML can be understood by learning the following three major elements:

Building blocks of UML

Rules to correlate the building blocks

Mechanisms of UML

Dynamic Model of UML
UML diagrams are of two different form and they are given below:
a) Structural  or Static view:
It represents the static structure of the system using objects, operations, attributes and relationships. The structural view includes composite structure  and class diagrams.
b) Dynamic or Behavioral view:
It represents the dynamic nature of the system by displaying collaborations among objects and alterations to the internal states of objects. This representation includes activity diagrams, state machine diagrams and sequence diagrams.

UML models can be replaced with UML tools by utilizing the XMI interchange format.

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