Programmer Group

1. Preface 19 years passed pretty fast. As the first one of 20 years, I want to make a simple summary here for the previous year: seriously, 19 years passed pretty miserable. Yes, the conclusion is this sentence. After all, the sense of ceremony must still exist. Well, let's not talk about it. I hope it's better after 20 years. Save more money ...

Preface: Dialog box is often used in daily development process. If there are many dialog boxes, you can encapsulate a tool class of CustomDialog by inheriting dialog. If you use less, you can use the custom AlertDialog to implement the pop-up box. In the process of using the custom AlertDialog, you may encounter the following ...

Summary In distributed systems, there are scenarios where a globally unique ID is required. In order to prevent ID conflicts, a 36-bit UUID can be used, but it has some drawbacks. First, it is relatively long, and UUIDs are generally out of order. Sometimes we want to be able to use a simpler ID, and we want IDs to be generated in time order. ...

Following Remember a blood case caused by passing a file handle once After that, the demo triggered another blood case, which is now recorded below. This time I'm testing file handle transfer on linux, which does not have a STREAMS system. The handle is therefore passed using the control message part in sendmsg/recvmsg of the unix domain socke ...

1. Set Axios cross domain in Vue axios has become the officially recommended way for Vue to obtain background data from ajax. However, we need to solve the cross domain problem of axios in use. Here we take the 2.x version of Vue cli as an example to solve the cross domain problem of axios. In config/index.js We implement the ...

Position parameter sign $0: script file absolute Lujin $1-9: position parameter mark less than 10 ${10..}: position parameter marker greater than 10 $×: total number of parameters $*: expand to a list of location parameters starting at 1. When it's enclosed in double quotes When it gets up, it expands into a stri ...

Environmental Science: CentOS 7,mysql5.7 Summary description: This article mainly describes how to use mysql common functions, such as string correlation function, date format function, calculation function, etc Steps: 1. Mathematical function Functions for mathematical calculation: -- ABS(X):Return X Absolute value sele ...

The string to get started with Python 1. The concept and creation of strings 1. The concept of string *In programs, text content is represented as a string *Strings are composed of a series of ordered characters, such as:'helloworld' *Strings and lists, tuples, are of sequence type' *You can think of strings as lists of characters, and many op ...

Development Tools: IEDA, JDK1.8, WinHex 1. Byte code file structure source code package com.jalja.java.bytecode; /** * @Auther: XL * @Date: 2020/1/4 12:58 * @Description: */ public class BytecodeTest { private int num=1; public int getNum() { return num; } public void setNum(int num) { this.num = num; ...

1, Network topology Two, PAP 2.1 PAP single authentication: R1 is the server, R2 is the client R1 To configure: R1>enable R1#configure terminal R1(config)#username jsxjs password adminjsxjs R1(config)#interface s0/0 R1(config-if)#encapsulation ppp R1(config-if)#ppp authentication pap R2 To configure: R2>enable R2#con ...