Programmer Think

Today is another day submerged by pouring demand. Does anyone know where to sign up for the chicken soup class of "I cut 18 demands for me in three sentences" and want to apply. The class of "understanding applause" is even more difficult. Going further, back to our topic today, let's understand the catalogue of this ...

The kafka environment operation process is built on linux (CentOS7), and the schemes are docker and docker compose 1. Basic environment 1.1. yum source configuration Install source using alicloud cd /etc/yum.repos.d rename .repo .repo.bak *.repo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo curl -O ...

catalogue 1. Character pointer  2. Pointer array 3. Array pointer 4. Array parameters and pointer parameters 5. Function pointer 6. Function pointer array 7. Pointer to function pointer array 8. Callback function When we first learned the C language, we had a preliminary contact with the existence of pointer and had a general ...

catalogue 1, Variables and constants 2, Identifier Note: scala keyword 3, String 4, Keyboard input 5, Data type  1. Integer type 2. Floating point type 3. Character type 4. Boolean type 5.Unit type, Null type and Nothing type 6, Type conversion 1. Automatic conversion of value type 2. Cast type  3. Conversion between nu ...

Fork / Join is a tool framework. Its core idea is to cut a large operation into multiple small parts and make the most efficient use of resources. It mainly involves three classes: forkjoinpool / forkjointask / recursive task 1, Overview ava.util.concurrent.ForkJoinPool is written under the auspices of Java master Doug Lea. It can split a lar ...

...... 3. Operation on file structure 3.1 fs.readdir(url,(error,data)=>{}) Role: Read all files in the folder Reference: Path to url folder Two parameters: callback function, built-in two parameters, error information and resource handle const fs = require('fs'); //Asynchronous read mode fs.readdir('./file',(error,data)=>{ if(error): ...

prefaceIn short, the Internet is a large network composed of sites and network devices. We visit sites through the browser, and the site returns HTML, JS and CSS codes to the browser. These codes are parsed and rendered by the browser to present colorful web pages in front of us;1, What is a reptile?If we compare the Internet to a large spider ...

Tip: the following is the main content of this article, and the Java series learning will be continuously updated (1) Basic concepts   abstract class: a superset of ordinary classes, but with more abstract methods than ordinary classes. For a class decorated with the abstract keyword, an abstract class cannot instantiate an obj ...

Use of 6 kinds of Callback Unified entrance Primitive class //Six methods are provided to test the six Callback effects respectively public class UserService { public String forFixedValue() { return "self FixedValue"; } public String forNoOp() { return "self NoOp"; } public String forDispatcher() { ...

1. Service gateway The reason for the emergence of API gateway is the emergence of micro service architecture. Different micro services generally have different network addresses, and external clients may need to call the interfaces of multiple services to complete a business requirement. If the client is allowed to communicate directly wi ...