Object oriented technology in software design

Features[ edit ] Object-oriented programming uses objects, but not all of the associated techniques and structures are supported directly in languages that claim to support OOP. The features listed below are, however, common among languages considered strongly class- and object-oriented or multi-paradigm with OOP supportwith notable exceptions mentioned.

Object oriented technology in software design

Features[ edit ] Object-oriented programming uses objects, but not all of the associated techniques and structures are supported directly in languages that claim to support OOP. The features listed below are, however, common among languages considered strongly class- and object-oriented or multi-paradigm with OOP supportwith notable exceptions mentioned.

Comparison of programming languages object-oriented programming and List of object-oriented programming terms Shared with non-OOP predecessor languages[ edit ] Variables that can store information formatted in a small number of built-in data types like integers and alphanumeric characters.

This may include data structures like stringslistsand hash tables that are either built-in or result from combining variables using memory pointers Procedures — also known as functions, methods, routines, or subroutines — that take input, generate output, and manipulate data.

Object-Oriented Software Construction

Modern languages include structured programming constructs like loops and conditionals. Modular programming support provides the ability to group procedures into files and modules for organizational purposes. Modules are namespaced so identifiers in one module will not be accidentally confused with a procedure or variable sharing the same name in another file or module.

Objects and classes[ edit ] Languages that support object-oriented programming typically use inheritance for code reuse and extensibility in the form of either classes or prototypes. Those that use classes support two main concepts: Classes — the definitions for the data format and available procedures for a given type or class of object; may also contain data and procedures known as class methods themselves, i.

For example, a graphics program may have objects such as "circle", "square", "menu". An online shopping system might have objects such as "shopping cart", "customer", and "product".

Object-oriented programming is more than just classes and objects; it's a whole programming paradigm based around objects data structures that contain data fields and methods.

It is essential to understand this; using classes to organize a bunch of unrelated methods together is not object orientation. Junade Ali, Mastering PHP Design Patterns [8] Each object is said to be an instance of a particular class for example, an object with its name field set to "Mary" might be an instance of class Employee.

Procedures in object-oriented programming are known as methods ; variables are also known as fieldsmembers, attributes, or properties. This leads to the following terms: Class variables — belong to the class as a whole; there is only one copy of each one Instance variables or attributes — data that belongs to individual objects; every object has its own copy of each one Member variables — refers to both the class and instance variables that are defined by a particular class Class methods — belong to the class as a whole and have access only to class variables and inputs from the procedure call Instance methods — belong to individual objects, and have access to instance variables for the specific object they are called on, inputs, and class variables Objects are accessed somewhat like variables with complex internal structure, and in many languages are effectively pointersserving as actual references to a single instance of said object in memory within a heap or stack.

Object oriented technology in software design

They provide a layer of abstraction which can be used to separate internal from external code. External code can use an object by calling a specific instance method with a certain set of input parameters, read an instance variable, or write to an instance variable.

Objects are created by calling a special type of method in the class known as a constructor. A program may create many instances of the same class as it runs, which operate independently. This is an easy way for the same procedures to be used on different sets of data.

Object-oriented programming that uses classes is sometimes called class-based programmingwhile prototype-based programming does not typically use classes.

As a result, a significantly different yet analogous terminology is used to define the concepts of object and instance. In some languages classes and objects can be composed using other concepts like traits and mixins.

Class-based vs prototype-based[ edit ] In class-based languages the classes are defined beforehand and the objects are instantiated based on the classes.Design patterns: elements of reusable object-oriented software Erich Gamma.

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WA1783 Introduction to Developing OO Applications using RAD 0

£ Test Driven Development: By Example (The Addison-Wesley Signature Series) Kent Beck. out of 5 stars Paperback. £Reviews: • object-oriented concepts • OO analysis, design, and implementation techniques • object-oriented design methods • (aka software development life cycles) • Students should view OO software development as a software engineering process that has well-defined stages with each stage requiring specific tools and techniques.

This paper describes the results of a study where the impact of Object-Oriented design on software quality characteristics is experimentally evaluated. A suite of metrics for OO design, called MOOD, was adopted to measure the use of OO design mechanisms.

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Object-oriented Technology in Software Design and Implementation "Object-oriented programming is a method of programming based on hierarchy of classes, and well-defined cooperating objects" (Essays, UK, ).

Object oriented technology in software design

Object-oriented programming is a type of programming language where the developer has to first, plan out the functions and operations to be applied to data structures before writing any code.

Both object-oriented programming and relational database management systems (RDBMSs) are extremely common in software today. Since relational databases don't store objects directly (though some RDBMSs have object-oriented features to approximate .

Designing Object-oriented Software - Rebecca Wirfs-Brock - Google Books