Object- oriented programming. Primary object- oriented language concepts. Work queue, geometry program, design patterns. An object consists of. Object- oriented program. What's interesing about this? Observer Pattern using Aspect-Oriented Programming. NYU CS undergraduate course on object-oriented programming.Using design patterns to develop reusable object-oriented communication software. Pattern languages of program design, ACM Press. In Proceedings of the Workshop on Pattern Languages of Object-Oriented. This paper proposes the use of design patterns to capture best practices in object-oriented finite. Software design pattern In software engineering. A description of the goal behind the pattern and the reason for using it. The encapsulation is the inclusion-within a program object-of all the resources needed for the object to. Universal encapsulation construct. Metaphor usefully ambiguous. Programming methodology. Subtyping allows extensions of concepts. Inheritance allows reuse of implementation. In object- oriented programming, object message(arguments)code depends on object and message . In conventional programming, operation (operands)meaning of operation is always the same . Fundamental difference between abstract data types and objects. Conventional programming add(x,y). Very important distinction. Overloading is resolved at compile time, Dynamic lookup at run time. Builder of a concept has detailed view. User of a concept has abstract view. Encapsulation separates these two views. Impelmentation code : operate on representation. Client code : operate by applying fixed set of operations provided by implementer of abstraction. Different code for different object. Subtyping and Inheritance. Interface : The external view of an object. Subtyping : Relation between interfaces. Implementation : The internal representation of an object. Inheritance : Relation between implementations. Interface : The messages understood by an object. The interface of an object is its type. If interface A contains all of interface B, then A objects can also be used B objects. Implementation mechanism. New objects may be defined by reusing implementations of other objects. Colored points can be used in place of points. Property used by client program. Colored points can be implementated by reusing point implementation. Technique used by implementer of classes. Group data and functions. Class : Defines behavior of all objects that are instances of the class. Subtyping : Place similar data in related classes. Inheritance : Avoid reimplementing functions that are already defined. Subtyping differs from inheritance. Classes and objects are useful organizing concepts. Culture of design patterns has developed around object- oriented programming. Shows value of OOP for program organization and problem solving. What is a design pattern? General solution that has developed from repeatedly addressing similar problems. Using most patterns will require some thought. Pattern is meant to capture experience in useful form. Varieties of OO languages. Simula : Object concept used in simulation (1. Smalltalk : Object- oriented design, systems (1. C++ : Adapted Simula ideas to C (1. Java : Distributed programming, internet. Object- oriented design. Primary object- oriented language concepts. Work queue, geometry program, design patterns.
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