pmbok chapter 8

This chapter describes the object-oriented design. Design is also a modeling activity. The design principles include modularization, coupling, cohesion, and reusability.Software design has several architectures. First, the warehouse architecture has two different software components: a subsystem that represents the current central data structure and a group of mutually independent data processing centers. Second, the hierarchical architecture organize

1. minimizing the scope of local variables can enhance code readability and maintainability and reduce the possibility of errors. In C, local variables must be declared at the beginning of a code block. In practice, some developers continue to do so.This habit needs to be corrected. Java provides syntax support for declaring variables anywhere in the code block.2. "To minimize the scope of a local variable, the most effective practice is to declare where it is used for the first time ". If a var

Chapter 8 For a week, I hardly saw Hassan. When I got up, I found the bread had been baked, the tea had been soaked, and a boiled egg had been put on the kitchen table. The clothes I had to wear that day had been ironed and placed on the rattan chair on the porch, where Hasan iron his clothes. He always waits for me to sit down and have breakfast before ironing -- so we can ha

Chapter 8 result types: the process of submitting a result to the server can be divided into two stages. The first stage queries the server status (queries or updates the database ), in the second stage, select an appropriate result page and return it to the user (the content of the result here ). Struts2 supports different types of returned results, such as JSP, freemarker, and velocity. Struts2 supports d

. Therefore, the common practice is to divide the index into many parts based on the serial number of the webpage and store them on different servers. When a query is received, the query is distributed to many servers. These servers process user requests in parallel and return the results to the master server for merge processing, finally, return the result to the user. With the increase of content on the Internet, there are more and more data. Therefore, you need to establish indexes of differe

next chapter of the class exclusive new_handlerAssume that the above scheme is changed to base class to inherit the derived class, and then convert the base class into a template, so that each derived class will obtain a class data replica with different entities. The base class section of this design allows Derived classes to inherit the set_new_handler and operator new required by them, while the template section reports that each derived class obt

Abstract classes are often used to characterize the abstract concepts we derive in the analysis and design of the problem domain, as an abstraction of a series of concrete concepts that look different, but are essentially the same, and we cannot instantiate them (not get a concrete one) so they are called abstractions. For example: We want to describe "fruit", it is an abstraction, it has quality, volume and other common (fruit quality), but also lack of characteristics (apples, oranges are frui

[' callback ' + ' (' + json.stringify (actionresult) + ') ': ActionResult; Res.send (Resultdata); Res.end ()} else {//process not response or Origin response.render or response.send. Process.nexttick ((_res:any) = {if (!_res.finished) {_res.end (); }, Res)}). catch (Processrequesterror = = {Next next (Processrequesterror); })} Through the concatenation of the Routehandler and RequestHandler two methods, we make a single call to our entire fragmented func

cannot use the form of the EXEC function name! The first way: Sql> Select Circle_area (3) from dual; Circle_area (3) -------------- 28.2743334 The second way: Sql> Declare 2 V_num number; 3 begin 4 V_num: = Circle_area (3); 5 Dbms_output.put_line (V_num); 6 end; 7/ 28.2743334 The PL/SQL block can also receive input from the user, for example: The user is now asked to enter an employee number, and then queries the employee's name based on what is entered. • The user's input information is co