java barcode generator library 3: Object-Oriented Analysis and Design in Java

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3: Object-Oriented Analysis and Design
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that will establish the route to the final destination. Deciding the functionality of the target destination is essential. To be effective, it must be captured and depicted in detail. In today s software development environment, we speak of objects as things that encapsulate attributes and operations. Before we proceed to the modeling standards being used today by software architects, let's begin with some basic definitions of object programming and its intending analysis, design, and life cycle.
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Key Features of OOP: Objects and Classes
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Object-oriented programming (OOP) is the methodology used for programming classes based on defined and cooperating objects. OOP is based on objects rather than procedural actions, data rather than logic. In days past, a program had been viewed as a logical procedure that used input data to process and produce output data. Object-oriented programming focuses on the objects we want to manipulate rather than the logic required to manipulate them. Object examples range from human beings (described by name, address, and so forth) to inanimate objects whose properties can be described and managed, such as the controls on your computer desktop buttons, scroll bars, and so on. Step one in OOP is to identify the objects to be manipulated and their relationships with each other. That is the essence of modeling. Once you ve identified an object, you generalize it as a class of objects and define the kind of data it contains and logic that can manipulate it. The logic is known as methods. A real instance of a class is called an object or an instance of a class. The object or class instance is executed on the computer. Its methods provide computer instructions, and the class object characteristics provide relevant data. You communicate with objects and they communicate with each other with defined interfaces called messages. The concepts and rules used in OOP provide these important benefits:
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n The concept of a data class makes it possible to define subclasses of data
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objects that share some or all of the main class characteristics. This is known as inheritance, and it is a property of OOP that facilitates thorough data analysis, reduces development time, and ensures more accurate coding.
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n Since a class defines only the data it needs, when an instance of that class
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is run, the code will not be able to access other program data improperly. This characteristic of data hiding provides greater system security and avoids unintended data corruption.
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Project Life Cycle
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n The definition of a class is reusable not only by the program for which it is
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initially created but also by other object-oriented programs. This facilitates distribution for use in other domains.
n The concept of data classes allows a programmer to create new data types
that are not defined in the language itself.
De ning Object-Oriented Analysis and Design
In terms of computing software, analysis is the development activity consisting of the discovery, modeling, specification, and evaluation of requirements. Object-oriented analysis (OOA) is the discovery, analysis, and specification of requirements in terms of objects with identities that encapsulate properties and operations, message passing, classes, inheritance, polymorphism, and dynamic binding. Object-oriented design (OOD) is the design of an application in terms of objects, classes, clusters, frameworks, and their interactions. In comparing the definition of traditional analysis with that of object-oriented analysis and design (OOAD), the only aspect that is new is thinking of the world or the problem in terms of objects and object classes. A class is any uniquely identified abstraction that is, a model of a set of logically-related instances that share the same or similar characteristics. An object is any abstraction that models a single element, and the term object as mentioned is synonymous with instance. Classes have attributes and methods, as they are more commonly known.
Project Life Cycle
The project life cycle is a pivotal concept in terms of understanding what a project is; the life cycle is a mapping of the progress of the project from start to finish. Projects, by definition, have a start and finish, like any good game. At the simplest level, projects have two phases: planning and executing. Planning and executing are okay for a simple, short-term project. Larger, long-term endeavors require another layer to be added to the life cycle of the projects. This can be achieved by subdividing each phase: plan and execute into two further phases, leading to a life cycle of analysis, design, development, and implementation.
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