2018-09-26 polymorphic interface class

... 一.interface syntax 1.Abstract class-->interface When all methods in the abstract class are abstract methods, this time can This abstract class is represented in another form, called the interface. 2. The syntax format requires interface to use the interface keyword definition. There...


The usage of extern in C language

... 1.extern modifiers the declaration of a variable or function. For example: if ac needs to reference the variable int v in bc, you can declare extern int v in ac, and then you can refer to variable v; note that the link attribute of the referenced variable v must be external link ...


TCP state transition diagram detailed tcp protocol explain

... In the front, has introduced the three-way handshake of TCP protocol and four wavers. As shown in the following figure, the TCP communication process consists of three steps: establishing a TCP connection channel (three-way handshake), data transmission, and disconnecting the TCP...


Create a normal web project in IntelliJ IDEA and run (non-maven project)

... installation tool 1、JDK7+ 2, IntelliJ Idea tool (after downloading and installing, find the registration code on the Internet) 3,tomcat7+ Unzipped version clear two concepts: 1, Project: similar to eclipse workspace concept 2, Module: similar to eclipse engineering project concept of...


Tradingview EMA index mean index judgment script

... EMA index average indicator script //Created By Wman on 7-20-2018 //tradingview indicator script Study("Wman-EMA-Group", overlay=true) Plot(ema(close, 5), title="EMA 5", style=line, linewidth=1, color=green) Plot(ema(close, 13), title="EMA 13", style=line, linewidth=1, color=yellow)...


Do you really understand JavaScript timers?

... I thought that the setTimeout function was asynchronous before today. I accidentally saw an article about setTimeout and found that my previous understanding was all wrong. . 先看一段码: var start = new Date(); setTimeout(function(){ var end = new Date(); console.log("Time elapsed: ", end -...


SQL SERVER-6-join connection query

... connect join --1. Internal connection --2. Outer connections: 1> left outer join 2> right outer join 3> full outer join --3. Self-joined create table TestJoin1Emp ( EmpId int identity(1,1) primary key, EmpName varchar(50), EmpDeptid int ) Insert into TestJoin1Emp values('长孙娜', ...


Java network programming

... 一, network programming model 二, main steps and code implementation 2.1 Socket communication steps 1 Create ServerSocket and Socket 2 Open the input/output stream connected to the Socket 3 Read/write operations on the Socket according to the protocol 4 Close the input and output streams,...


Black Cat Daily Update - Clara script precision drainage

... [Usage steps] Step: Download Night God Simulator Version 6.0.0.0 Step 2: Install Drain Script + App Default Will be packaged in the folder after downloading and unzip can see third step: set night god simulator: custom resolution width: 480 high: 800 DPI: 160 third step: set the night...


Flexible Box (Flex)

... 目录 一,概念 一, Concept Flex is an abbreviation of Flexible Box, meaning "elastic layout", used for box The shape model provides maximum flexibility. A new layout that belongs to CSS3. When the page needs to adapt to different screen sizes and device types, make sure the elements have the...