Introduction to oop (object oriented programming)
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The document outlines the educational goals and principles of Object-Oriented Software Development, covering object-oriented analysis and design, programming concepts, and Visual Basic's history and evolution. It highlights key features of object-oriented programming, emphasizes methodologies like Object-Oriented Software Engineering (OOSE), and provides a timeline of Visual Basic versions from 1.0 to 6.0. Key points include the significance of objects and classes, program structure, and the evolution of Visual Basic as a programming environment.
Introduction to oop (object oriented programming)
- 1. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Object – Oriented Software Development (Elective) IT 533
- 2. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Educational Goals ___________________________________________ Apply principles and patterns to create better object- oriented software designs • Iteratively follow a set of common activities in analysis and design
- 3. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Object-oriented analysis: Emphasis on finding and describing the objects, or concepts, in the problem domain. The primary tasks in object-oriented analysis (OOA) are: 1. Identifying objects 2. Organizing the objects by creating object model diagram 3. Defining the internals of the objects, or object attributes 4. Defining the behavior of the objects, i.e., object actions 5. Describing how the objects interact 6. The common models used in OOA are use cases and object models.
- 4. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Object-oriented design: Emphasis on defining software objects and how they collaborate to fulfill the requirements. The implementation details generally include: 1. Restructuring the class data (if necessary), 2. Implementation of methods, i.e., internal data structures and algorithms, 3. Implementation of control, and 4. Implementation of associations.
- 5. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 What is object oriented software? Object-oriented software engineering (commonly known by acronym OOSE) is an object-modeling language and methodology. OOSE was developed by Ivar Jacobson in 1992 while at Objectory AB. It is the first object-oriented design methodology to employ use cases to drive software design.
- 6. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 What is Object Oriented Programming? Object Oriented Programming (OOP) means any kind of programming that uses a programming language with some object oriented constructs or programming in an environment where some object oriented principles are followed.
- 7. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 At its heart, though, object oriented programming is a mindset which respects programming as a problem-solving dilemma on a grand scale which requires careful application of abstractions and subdividing problems into manageable pieces.
- 8. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Compared with procedural programming, a superficial examination of code written in both styles would reveal that object oriented code tends to be broken down into vast numbers of small pieces, with the hope that each piece will be trivially verifiable.
- 9. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 OOP was one step towards the holy grail of software-re- usability, although no new term has gained widespread acceptance, which is why "OOP" is used to mean almost any modern programming distinct from systems programming, assembly programming, functional programming, or database programming. Modern programming would be better categorized as "multi-paradigm" programming, and that term is sometimes used.
- 10. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 The important features of object–oriented programming are: 1. Bottom–up approach in program design 2. Programs organized around objects, grouped in classes 3. Focus on data with methods to operate upon object’s data 4. Interaction between objects through functions 5. Reusability of design through creation of new classes by adding features to existing classes
- 11. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Visual Basic/History Visual Basic is Microsoft's high-level object-oriented rapid application development environment for the Windows platform. The first versions of Visual Basic were intended to target Windows 3.0 (a version for DOS existed as well), however it was not until version 3.0 for Windows 3.1 that this programming language gained large-scale acceptance in the shareware and corporate programming community.
- 12. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Using drawing tools that resemble those found in hardcopy page layout programs or PhotoShop, VB programmers make user interfaces by drawing controls and other UI components onto forms. The programmer then adds code to respond to user interactions with the controls (for example, clicks, drag and drop, etc) known as events. The code can trigger events in other controls (for example, by displaying text or an image), execute procedures (run some algorithm based on the values entered in some control, output data, do business logic, etc), or almost anything else one might do in code.
- 13. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Visual Basic can be considered to be an interpreted language like its Basic ancestor, with appropriate modifications to accommodate object-oriented programming, and has implicit type conversion. That is, the VB development environment goes to great lengths to format (and aid the user in formatting) programming code so that it conforms to executable syntax.
- 14. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 For example, VB will appropriately change the case of newly typed variable names to match those that have been declared previously (if they have been declared at all!). Traditionally, VB is known for compiling programs into pseudo-code (p- code, similar to Java's byte code) which is interpreted at runtime, requiring the use of dynamically-linked libraries (for example, VBRUN300.DLL for version 3 of Visual Basic, circa 1992) but newer versions can compile code into something more closely resembling the efficient machine code generated by C-like compilers. VB6 can be compile either into p-code or into native code; in fact VB6 uses the Microsoft C++ compiler to generate the executable.
- 15. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 For new Windows programmers, VB offers the advantage of being able to access much of the Windows UI functionality without knowing much about how it works by hiding the technical details. Although accessing low-level Windows UI functionality is possible, doing so in VB is as, or more difficult compared to such access using Visual C++ or other lower level programming languages. Recently VB.NET has gone a long way to fixing some of the limitations.
- 16. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Using custom controls provided by Microsoft or third parties, almost any functionality that is possible in Windows can be added to a VB program by drawing a custom control onto a form in the project. Visual Basic traditionally comes in at least entry level and professional versions, with various designations depending on Microsoft's contemporary marketing strategy. The different versions are generally differentiated by the number of custom controls included, and the capabilities of the compiler. Higher priced packages include more functionality.
- 17. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Evolution of Visual Basic VB 1.0 was introduced in 1991. The approach for connecting the programming language to the graphical user interface is derived from a system called Tripod (sometimes also known as Ruby), originally developed by Alan Cooper, which was further developed by Cooper and his associates under contract to Microsoft.
- 18. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Timeline of Visual Basic Visual Basic 1.0 (May 1991) was released for Windows. Visual Basic 1.0 for DOS was released in September 1992. The language itself was not quite compatible with Visual Basic for Windows, as it was actually the next version of Microsoft's DOS-based BASIC compilers, Microsoft QuickBASIC compiler QuickBASIC and BASIC Professional Development System. The interface was barely graphical, using extended ASCII characters to simulate the appearance of a GUI.
- 19. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Visual Basic 2.0 was released in November 1992. The programming environment was easier to use, and its speed was improved. Visual Basic 3.0 was released in the summer of 1993 and came in Standard and Professional versions. VB3 included a database engine that could read and write Access databases. Visual Basic 4.0 (August 1995) was the first version that could create 32-bit as well as 16-bit Windows programs. It also introduced the ability to write classes in Visual Basic.
- 20. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 With version 5.0 (February 1997), Microsoft released Visual Basic exclusively for 32-bit versions of Windows. Programmers who preferred to write 16-bit programs were able to import programs written in Visual Basic 4.0 to Visual Basic 5.0, and Visual Basic 5.0 programs can easily be converted with Visual Basic 4.0. Visual Basic 5.0 also introduced the ability to create custom user controls, as well as the ability to compile to native Windows executable code, speeding up runtime code execution. Visual Basic 6.0 (Mid 1998) improved in a number of areas, including the ability to create web-based applications using Internet Explorer. Visual Basic 6 is no longer supported.
- 21. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533
- 22. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533
- 23. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533
- 24. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533
- 25. Instructor: Mr. Mark John P. Lado University of the Visayas – Danao City Campus IT 533 Turn on your PC and open the Microsoft Visual Basic 6.0 Software Application.