cocoa objective c

-oriented structural analysis method SA (data flow diagram DFD, data dictionary DD, and processing logic description) the Entity Relation Diagram ERD that depicts the system data relationship, the Jackson method JSD for data structure, and the Object-Oriented Analysis Method OOA (mainly using UML) for software with Dynamic Time Series Problems, formal technology can be used, including the status transition (conversion) graph STD, Time Sequence Graph,

? These two pieces of code have three lines of duplicate code, violating a common programming principle dry (Don ' t Repeat yourself), the solution is to process the abstraction, write a function printn:public void Printn (int n) {for (int i=1; iThe above two pieces of code can be used;PRINTN (3); PRINTN (4);Instead, print out "1..100" is also very simple, just call PRINTN (100);2. Encapsulation, inheritance and polymorphismThe three elements of object-oriented (object-oriented) include: encapsu

procedural way. When describing a problem solution, use a problem-oriented and implementation-oriented terminology.In program design, abstraction consists of two aspects, one is process abstraction and the other is data abstraction.( 2 ) encapsulation, inheritance, and polymorphismThe three elements of object-oriented (object-oriented) include: encapsulation, inheritance, polymorphism. Object-oriented thinking involves all aspects of software development, such as object-oriented analysis (

-oriented analysis (OOA), Object-oriented design (OOD), and object-oriented programming (OOP). OOA decomposes The system according to the abstract key problem domain and focuses on what. The main line that runs through OOA, Ood, and OOP is abstraction.(3) Ood modeling will be modeled using the Graphical Modeling Language UML (Unified Modeling Language), UML is a

elements: encapsulation, inheritance, polymorphism.(2) Object-oriented thinking involves all aspects of software development, such as object-oriented analysis (OOA), Object-oriented design (OOD), and object-oriented programming (OOP). OOA decomposes The system according to the abstract key problem domain and focuses on what. The main line that runs through OOA,

The Java language is a purely object-oriented programming language, which mainly shows that Java fully supports three basic features of object-oriented: inheritance, encapsulation, and polymorphism. The Java language is completely object-centric, and the smallest program unit in a Java program is a class, and the entire Java program consists of one class.Java fully supports the use of object, class, inheritance, encapsulation, message and other basic concepts to design, allowing the real world f

; } public double Getimagepart () {return imagepart; } public Complex () {realpart = 0; Imagepart = 1; } public Complex (double r,double I) {realpart = R; Imagepart = I; } public boolean equals (Object obj) {if (this = = obj) {return true; } if (! ( obj instanceof Complex)) {return false; } Complex Complex = (Complex) obj; if (complex. Realpart! = ((Complex) obj). Realpart) {return false; } if (complex. Imagepart! = ((Complex) obj). Image

the Object ID, service ID, input information, and response information of the provided service. 43. PolymorphismPolymorphism refers to the inheritance of attributes defined in the parent class or service quilt class, which can have different data types or show different behaviors. 44. Active ObjectAn active object is a set of attributes and encapsulation body of a group of services. At least one service can be actively executed (called an active service) without receiving messages ). 45. Object

1. Summary of Software Development Training After several days of training, I personally have a more systematic and comprehensive understanding of the entire process of software development. At the same time, I have learned more than just the relevant knowledge of software development, there are also mature ways to think about the problem and the ability to grasp the problem as a whole.2. Knowledge Summary 2.1. Summary of analysis training The following are the key points of the training:

graphs, one is the state diagram, the other is the event tracking graphState diagram: A network of States and events that focuses on describing the dynamic behavior of each type of objectIn a state diagram, a state is a generalization of a property feature in a moment. State migration indicates when this class of objects responds to which events occur within the system.Event Tracking graph: focuses on explaining a specific "scenario" that occurs during system executionFunctional model: What out

ArticleDirectory Case Analysis Object-Oriented Modeling The main task of object-oriented analysis is to establish an accurate, complete, and consistent System Model Based on your needs. In the object-oriented analysis and design process, the project team obtains an idealized system model by analyzing the functional and non-functional requirements of the software, this model describes what problems we need to solve and how to solve them.Important Process of Modeling

service, as described in his title. JavaWorldArticleWhat is service-oriented architecture ?, Some SOA is well described, but there is still no definition of service. It can be seen that this service is really hard to define for him, just as we knew what it meant when we defined an object in OOA, there is no accurate definition to describe one.Next, it is true that OOA or SOA is actually an ideological d

(i) UML Overview1, object-oriented software development process:(1) OOA (object-oriented analysis): Establish an analytical model and document it. (2) OOD (object oriented design): The result of OOA is refined by object-oriented thought, and the design model is obtained. (3) OOP (object-oriented programming)2, UML is the results of OOA and ood with a unified symb

does not pass (no product code)Write the Product CodeTest PassRefactor the code and ensure the test passes (refactoring the next lab session)Cycle through the development of all functions. Object-oriented three elements The three elements of object-oriented (object-oriented) include: encapsulation, inheritance, polymorphism. Object-oriented thinking involves all aspects of software development, such as object-oriented analysis (OOA), Object-

development, such as object-oriented analysis (OOA), Object-oriented design (OOD), and object-oriented programming (OOP). OOA decomposes The system according to the abstract key problem domain and focuses on what. Ood is an object-oriented implementation of the symbolic design system, which constructs the system into a "real-world" object in a way that is very close to the problem domain terminology, and f

test code, JUnit appears red bar• Modify the Product code· JUnit appears green bar, Task complete(ii) Object-oriented three elements(1) AbstractAbstract refers to the abandonment of the appearance of things and the extraction of essential factors in the cognitive thinking activities. includes two aspects, one is the process abstraction, the other is the data abstraction. The result of the process abstraction is the function, and the result of the data abstraction is the abstract data type (Type

very simple, just call PRINTN (100);(2) encapsulation, inheritance and polymorphismThe three elements of object-oriented (object-oriented) include: encapsulation, inheritance, polymorphism. Object-oriented thinking involves all aspects of software development, such as object-oriented analysis (OOA), Object-oriented design (OOD), and object-oriented programming (OOP). OOA decomposes The system according to

conditionstestException,We add a use case to test the boundary condition testBoundary ,How to get JUnit gree bar out and try it out, such as:Regardless of TDD, writing high-quality test cases is the most important, how to do unit testing, you can refer to the "Unit test of the road" this book. In addition, "Agile Java Chinese version" shows how to integrate Java and TDD effectively, through TDD Drive project development, interested can be consulted.(2) encapsulation, inheritance and polymorphis

extracting the essential features of things and not considering their details for the time being. For complex system problems, we can solve problems by means of hierarchical abstraction. At the highest level of abstraction, the solution of the problem is described in a generalized way, using the language of the problem environment. In the lower layers of abstraction, they are described in a procedural way. When describing a problem solution, use a problem-oriented and implementation-oriented te

capabilities. Abstraction is a matter of extracting the essential features of things and not considering their details for the time being. For complex system problems, we can solve problems by means of hierarchical abstraction. At the highest level of abstraction, the solution of the problem is described in a generalized way, using the language of the problem environment. In the lower layers of abstraction, they are described in a procedural way. When describing a problem solution, use a proble