Modelling Concept for Android

Some Essential Modeling Concepts of Java which are important to keep in mind while Learning with Android Training in Chandigarh 

 

 

 

The Three Models which are useful to model a system with Android Training in Chandigarh:

The Three models are useful to model a system from three related but different viewpoints, each capturing important aspects of the system, but all required for a complete description.

Three kinds of models separate a system into distinct views, The different models are not completely independent - a system is more than a collection of independent parts - but each model can be examined and understood by itself to a large extent.

Each of the three models evolves during development. First analysts construct a model of the application without regards for eventual implementation.

The word Model has two dimensions :

1. A view of a system ( Class Model, State Model, Or interaction model).
2. A stage of development ( analysis, design, or implementation ).

These three models are as following :

1. Class Models : Class Models describes structure of objects in a system - their identity , their relationships to other objects, their attributes and their operations. Class Model  Provides context for the state and interaction models

Class Diagrams express data model is to capture those concepts from the real world that

are important to an application.

2.     State Models : State model describes those aspects of objects concerned with time and    sequencing  of operations - events that mark changes , states that define the context for events and the organization of events and states. State Model captures control, the aspects of a system that describes the sequences of operations that occur, without regard for what the operations do, what they operate on, or how they are implemented

3.  Interaction Models : The Interaction model describes interaction between objects - how individual objects collaborates to achieve the behavior of the system as a whole. The state and interaction models describes different aspects of behavior, and you need both to describe behavior fully.

Designing steps of class Modeling :

Step 1:  Follow law of Demeter.

Step 2:  Minimize Coupling.

Step 3: Maximize Cohesion.

Step 4: Methods Should do Something.

Step 5: Separate commands from queries

Step 6: Beware of Con nascent Software elements.

Step 7: Consider Adding color to your Diagrams.

2. State Modeling : A state model represents the process model for one type of change of request. A State represents the status of a change request, For example Submitted, Assigned, Opened and Closed.

Events included in the state modeling :

An Event something that happens in a point of time. A one- way transmission of information from one object to another or some occurrence that may cause the state of a system to change. An event has no duration.

Types of Events :

1. Time Events
2. Guard Condition becoming True
3. Change Events
4. Call Events
5. Signal Events 
   
   
   
   
   
   

For More Practical you can visit Android Training in Chandigarh aims at providing you with a systematic approach in learning. Our Android Training in Chandigarh will make you to understand the subject very well and prepare you for the real time working experience.We guide you to design & publish your Application and further you can easily deploy applications for Android phones and tablets, using the Java programming language.The scope for Android application development is immense and need for Android developers is also on the rise.