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1. What is an agent? The classical meaning is sales agent, which, on the basis of signing a contract, sells certain products or all products for the principal (manufacturer), and has full authority over the price, terms and other transaction conditions.When we buy products from a sales agent, we usually don't know who the client (manufacturer) ...

If a crawler wants to crawl the required information, the first step is to grab the html content of the page, and then analyze the html to get the desired content. Last essay< Java Crawler Series 1: Write Before Starting > It is mentioned that HttpClient can crawl page content. Today, let's introduce the tool for grabbing html content: H ...

- I. Demand Analysis- two,- 1. Demand Analysis and Data Table DesignDemand map: Discovery class:    01.moto class (automobile parent class):        01.1: bus (bus)        01.2: car (car)        01.3: Truck ...

Iterator mode, also known as Cursor mode. GOF defines it as providing a way to access elements of a container object without exposing the internal details of the object. The core idea of STL is to decouple data containers and algorithms, so that containers and algorithms have good generic ability, while iterator plays a glue role between them ...

Recently, I am learning about the electron ic framework, and I want to use this framework to make a simple calculator demo. When I was calculating decimals, I found a problem. 0.1+0.2=? The output is 0.30000000000004. Why? In fact, for the four operations of floating point numbers, almost all programming languages will have similar accura ...

14.1 Basic Introduction Scala ornament runs on the Java Virtual Machine, so it has the following characteristics 1) Easy implementation and rich Java class libraries interconnection 2) It supports both object-oriented programming and functional programming. 3) The program it writes is as concise as a dynamic language, but in fact it is a st ...

The toString method of Object class Class Object is the root class of class hierarchy Each uses Object as a superclass All objects implement methods of this class //This is a subclass of the Object class, which implements all its methods public class Person{ private String name; private int age; public Person(){} public Per ...

Sketch The function of the interface is to provide a way to interact with other systems. Other systems don't need (or can't) know the details inside, but can only communicate with each other through the interface provided outside. Pure virtual functions (slots are no exception) are easy to understand, so what about signals? Is it val ...

Inner class Classes defined within other classes are called internal classes, and classes containing internal classes are called external classes. The characteristics of internal classes: Better encapsulation allows internal classes to be encapsulated in external classes, and no other classes in the same package are allow ...

SWIG is a development tool that helps software written in C or C++ to be embedded with other high-level programming languages. SWIG can be used in a variety of different languages, including common script compiling languages, such as Perl, PHP, Python, Tcl, Ruby and PHP. SWIG is widely used to create high-level language parsing or assembly en ...