Case study examples for object oriented software engineering

Modeling can be as straightforward as drawing a flowchart listing the steps carried out by an application.

Defining a model makes it easier to break up a complex application or a huge system into simple, discrete pieces that can be individually studied. We can focus more easily on the smaller parts of a system and then understand the "big picture. Understanding a system is the first step in either building or enhancing a system.

This involves knowing what a system is made up of, how it behaves, and so forth. Modeling a system ensures that it becomes readable and, most importantly, easy to document. Depicting a system to make it readable involves capturing the structure of a system and the behavior of the system.

Reusability is the byproduct of making a system readable. After a system has been modeled to make it easy to understand, we tend to identify similarities or redundancy, be they in terms of functionality, features, or structure. Even though there are many techniques and tools for modeling, in this article series, we will be concerning ourselves with modeling object-oriented systems and applications 4. This essentially means that UML provides the ability to capture the characteristics of a system by using notations.

UML provides a wide array of simple, easy to understand notations for documenting systems based on the object-oriented design principles. These notations are called the nine diagrams of UML. UML does not have any dependencies with respect to any technologies or languages. This implies that we can use UML to model applications and systems based on either of the current hot technologies; for example, J2EE and.

Every effort has been made to keep UML as a clear and concise modeling language without being tied down to any technologies. Hence, UML is made up of nine diagrams that can be used to model a system at different points of time in the software life cycle of a system. The primary elements are termed as "actors" and the processes are called "use cases.

The class diagram classifies the actors defined in the use case diagram into a set of interrelated classes. The relationship or association between the classes can be either an "is-a" or "has-a" relationship. Each class in the class diagram may be capable of providing certain functionalities. These functionalities provided by the class are termed "methods" of the class.

Apart from this, each class may have certain "attributes" that uniquely identify the class. An object is an instance of a class. This essentially means that an object represents the state of a class at a given point of time while the system is running.

The object diagram captures the state of different classes in the system and their relationships or associations at a given point of time. Objects in the system change states in response to events. In addition to this, a state diagram also captures the transition of the object's state from an initial state to a final state in response to events affecting the system. Similar to a state diagram, an activity diagram also consists of activities, actions, transitions, initial and final states, and guard conditions.

The important aspect of a sequence diagram is that it is time-ordered. This means that the exact sequence of the interactions between the objects is represented step by step. Different objects in the sequence diagram interact with each other by passing "messages". The interactions are listed as numbered interactions that help to trace the sequence of the interactions.

The collaboration diagram helps to identify all the possible interactions that each object has with other objects. This diagram depicts, at a high level, what components form part of the system and how they are interrelated. A component diagram depicts the components culled after the system has undergone the development or construction phase.

This diagram is by far most useful when a system is built and ready to be deployed. UML Diagram Classification—Static, Dynamic, and Implementation A software system can be said to have two distinct characteristics: a structural, "static" part and a behavioral, "dynamic" part.

In addition to these two characteristics, an additional characteristic that a software system possesses is related to implementation. Before we categorize UML diagrams into each of these three characteristics, let us take a quick look at exactly what these characteristics are. The static characteristics define what parts the system is made up of. Each of these views represents how a system can be modeled.

This will enable us to understand where exactly the UML diagrams fit in and their applicability. This gives an idea of what a given system is made up of. Class diagrams and object diagrams form the design view of the system.

The different diagrams such as the state diagram, activity diagram, sequence diagram, and collaboration diagram are used in this view. Use case diagrams of UML are used to view a system from this perspective as a set of discrete activities or transactions. Because the primary use of a UML tool is to enable you to draw diagrams, first and foremost, we need to see what types of UML diagrams the tool supports.

Let us take a look at another scenario. Suppose you were given a large set of source code files with lots and lots of classes.

Wouldn't it be a nightmare wading through the code trying to figure out how all the classes are interconnected? This is where UML tools step in to make things a lot easier by providing support for such features. Login options Check if you have access through your login credentials or your institution to get full access on this article.

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Other Metrics View Article Metrics. Bibliometrics Citations 3 Article Metrics 3. In imaging and communication systems, incorporation of high range security is essential because there is a massive threat to sensitive data.

Hackers are frequently hacking confidential data. To overcome this problem, the proposed system is implemented for image encryption through the advances encryption standard algorithm so that intrusion attacks for imaging systems as well as digital images misuse can be prevented. The AES algorithm is used to encrypt the digital images, then the sender and receiver can only be viewed.

The proposed system employs the location of geography for verification. If it notices any abnormal pattern, then the user needs to go through the verification method again. Depending on this information, it measures the normal user behavior models for separate users. In any strange activities, this detection system will give alerts and also blocks the operator once he made three unacceptable attempts. In industries, software piracy is a major threat because hackers using different malicious and malware codes to get access to software products.

At first, the users must register their software products and then buy the software online. When the online payment is done, software product users can easily download the software along with the serial key. This software reads the desktop ID so that it generates a user ID through an algorithm.

So the user can access by using the ID and serial key. If the generated key matches with the user key, it gives access to the software product otherwise it will be locked.

The Agile meaning is fast otherwise adaptable and it refers to the development of software depending on the expansion of iterative. The methods of Agile will split the tasks into mini iterations. The separation of the whole project into minor parts will help in reducing the risk of project risk and also the delivery time of the entire project.

The agile model includes different phases like a gathering of requirements, design, iteration or construction, assurance of quality or testing, deployment, and feedback. Java is an object-oriented programming language that is used in different applications as well as websites to work properly.

Java is everywhere like laptops, game consoles, data centers, scientific supercomputers, cell phones, etc. The software engineering projects based on java include the following.

The optical character recognition project is developed by using the JAVA programming language. This project implements a device to send an input file for reading the data from documents. It is very simple to change the content on screenshots as well as PDF files.

The image can be attained through an optical scanner. This project uses different modules based on the developer requirement. The interface design can be done using the android studio as well as coding for creating a quiz on the smartphone. This project develops a tracking system for bugs within the software program.

This project is developed by using Java language to remove viruses or bugs in the program. This project helps in finding the errors in a program and removes it. The proposed system is used to build software using Java language for an electricity billing system to get precise details of electricity consumption in families.

The manual operation is quite difficult as it requires suitable data and measurement. To overcome this, the billing system device is implemented which solves the problem as well as determines the accurate unit for both the customer and the electricity department.

This project is implemented by using the JAVA programming language to develop an android app. This app helps tourists like a guide project who desire to travel around the world. The layout of this project can be designed with XML and modules of this project can be designed based on the developer requirements. The communication software based on the internet is a mail server. This software is developed through Java language. This mail server application can be developed through the Java programming language because it improves the flexibility and portability of the system.

Java programming language supports the safety system and enhances the overall software compatibility by offering particular exception handling devices. The list of software engineering projects based on cloud computing includes the following. This project is developed by using cloud computing. For learners, it is a modern platform depending on the internet.

A learner can simply look for books or videos to download them wherever he is required. In the E-learning process, the main parts are learning, reusing, and sharing. In websites, a learner can gather the learning modules directly. This system manages and stores the information on e-book based on the categories. It will allow your prospects to see how your solutions address their needs.

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