What is design process in Ooad?
In short, Object Oriented Design (OOD) is a method of design encompassing the process of object oriented decomposition and a notation for depicting both logical and physical models of the system under design. The objects are independent and in an encapsulated state and representation information.
What is meant by View layer in Ooad?
Designing view layer classes • UI layer consists of – objects with which user interacts – Objects needed to manage or control UI • Responsibility of view layer objects – Input :responding to user interaction • Translating user’s action into an appropriate response – Output :displaying or printing business objects.
What is the purpose of view layer in Ooad?
View layer is the only exposed objects of an application with which users can interact. Represents the set of operations in the business that users must perform to complete their tasks.
What are the activities involved in the process of designing view layer write about them?
It consists of the following steps. Identify classes and objects. Identify class and object semantics….The process of designing the user interface involves,
- Classifying the specific need of the application.
- Identify the use cases and interface objects.
- Devising the design that best meets user’s needs.
What is system and process in Ooad?
In this stage, the complete architecture of the desired system is designed. The system is conceived as a set of interacting subsystems that in turn is composed of a hierarchy of interacting objects, grouped into classes. Here, the emphasis is on the objects comprising the system rather than the processes in the system.
What are the application responsible for the view layer?
The view layer has two important tasks: presenting data to the user. and handling user interaction.
What is macro level process in Ooad?
Booch identifies a macro process that organizes an entire team’s activities over the course (weeks, months) of development. The micro process is iterative. It also emphasizes the interface and relationships between classes and objects over the implementation of specific methods in a class.
What are the layers in three layered approach of S W development?
Layered approach in software development – A clean way to database connectivity. Three level architecture for database connectivity: the data access layer, the middle layer, and the front layer.
What design methodologies are used in system design?
Design methods: 1) Architectural design: To describes the views, models, behaviour, and structure of the system. 2) Logical design: To represent the data flow, inputs and outputs of the system. Example: ER Diagrams (Entity Relationship Diagrams).
What are the main activities involved in design process in Ooad?
OOAD – Object Oriented Design
- Definition of the context of the system.
- Designing system architecture.
- Identification of the objects in the system.
- Construction of design models.
- Specification of object interfaces.
How does object oriented design ( OOD ) work?
After the analysis phase, the conceptual model is developed further into an object-oriented model using object-oriented design (OOD). In OOD, the technology-independent concepts in the analysis model are mapped onto implementing classes, constraints are identified, and interfaces are designed, resulting in a model for the solution domain.
How is a pattern defined in object oriented design?
A pattern can be defined as a documented set of building blocks that can be used in certain types of application development problems. During system design, the events that may occur in the objects of the system need to be identified and appropriately dealt with.
What does decomposition mean in object oriented design?
Decomposition means dividing a large complex system into a hierarchy of smaller components with lesser complexities, on the principles of divide–and–conquer. Each major component of the system is called a subsystem. Object-oriented decomposition identifies individual autonomous objects in a system and the communication among these objects.
What is an event in object oriented design?
During system design, the events that may occur in the objects of the system need to be identified and appropriately dealt with. An event is a specification of a significant occurrence that has a location in time and space. Signal Event − A named object thrown by one object and caught by another object.