Programmer Think

Class design, the second of two important structures: method Method: describe the function that the class should have. For example: Math class: sqrt()\random() Scanner Class: nextXxx() ... Arrays Class: sort() \ binarySearch() \ toString() \ equals() \ ... 1. Examples:public void eat(){}public void sleep(int hour){}public String getName(){ ...

1.JAVA escape characters -- common escape characters \t: A tab stop to realize the alignment function \n: Line feed \: one\ \: one \': one' \r: A carriage return System.out.println("Digital and efficient office\r information"); \\Information efficient office System.out.println("Digital and efficient office\r\n information"); \\Digita ...

1, Task: The purpose is to extract various commodity information in the network by using java crawler, establish a unified data model to store data, and describe the basic attributes of commodities through the data model. Such as spu, sku, product description, price and other information. At the same time, it is necessary to eliminate unnecess ...

Understand the principle of automatic configuration 1. SpringBoot features 1.1. Dependency management Dependency management of parent project Dependency management <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version ...

Ioc and annotation development 1. Spring configuration data source 1.1 function of data source (connection pool) Data source (connection pool) is the key to improve program performanceInstantiate the data source in advance and initialize some connection resourcesGet from data source when using connection resourcesReturn the connected res ...

Section I overview of network communication 1.1 software structure Network programming is a program that realizes the communication between two computers under a certain protocol C/S structure: the full name is Client/Server structure, which refers to client and server structure. Common programs include QQ... And other software B/S struct ...

✿ let's take learning introspection mechanism and reflection as an example 1. Learn new knowledge points - remember the function (first understand what it is, what is the connection and function with the previous knowledge points) (1) What is reflection first? [briefly understand and compare the official description] Simple understanding: r ...

preface I've been interfacing with some platforms recently, and then I use restTemplate to request First of all, of course, according to the document, and then postman to adjust it. They are all successful. Good ~ then, I use this tool to realize remote call, and then always report that contentType is not supported, but I have set the same ...

1,JSON 1.1 JSON description JSON(JavaScript Object Notation) JavaScript object notation (JSON comes from JS).JSON features: JSON is a lightweight data exchange format.JSON adopts a text format that is completely independent of the language, which means that the JSON data of different programming languages are consistent.JSON is easy fo ...

Statement: The information comes from your own arrangement.Reference book crazy Java handout (Fifth Edition) Li Gang © Write 1, Packaging 1.1 general    Java provides two type systems: basic type and reference type. Using basic type is efficient. However, in many cases, objects will be created for use, because objec ...