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This article mainly introduces the use of self, static and parent keywords in PHP object-oriented programming, and analyzes the functions, application scenarios and related use skills of self, static and parent keywords in combination with the form of examples. You can refer to the following examples for your friends, this article describes th ...

1. Parameter type of JVM Tools documentation https://docs.oracle.com/javase/8/docs/technotes/tools/unix/ 1. Standard parameters         2. - X parameters Nonstandard parameter: it may be different in different versions of JVM java defaults to mixed mode For example, change java mode to interpretation mode: java -Xint -version ...

Aspect Oriented Programming (Aspect Oriented Programming) is the product of the development of software programming ideas to a certain stage, and is a useful complement to object-oriented programming.AOP is generally used in situations with crosscutting logic, such as access control, transaction management, performance detection, and so on. Log ...

In the section of adding graphic verification code in Spring Security, we have implemented the account password login based on Spring Boot + Spring Security, and integrated the function of graphic verification code. At present, another very common way of website login is SMS authentication code login, but Spring Security only provides the login ...

[TOC] A program interacts with users 1.1. What is user interaction User interaction is when people input/input data to a computer, and the computer print s/outputs results 1.2. Why should I interact with users? Illustration: Fig. 12 To enable computers to communicate with users like people For example, in the past, when we went to the bank to ...

Adding the verification code can be roughly divided into three steps: generating the verification code picture according to the random number; displaying the verification code picture on the login page; adding the verification code verification in the authentication process. The authentication verification of Spring Security is completed by the ...

Pure virtual functions and abstract classes C Oriented Interface Programming and C polymorphism Function type syntax Foundation Analysis of the idea of function pointer as function parameter (callback function) Two ways to use function pointer as function parameter (forward call and reverse call) Pure virtual function abstract class Basic ...

24 point game is a classic card puzzle game. Common rules of the game: Remove four cards at A time from poker. Using addition, subtraction, multiplication and division, the first one to get 24 wins. (among them, J stands for 11, Q stands for 12, K stands for 13, A stands for 1), and the 24 point game is solved by programming ...

There are three ways to implement the distributed lock: 1. Optimistic database lock; 2. Redis based distributed lock; 3. ZooKeeper based distributed lock. This blog will introduce the second way to implement distributed locks based on redis. Although there are various blogs about the implementation of redis distributed lock on the Internet, the ...

The so-called context manager is a class that rewrites the "enter" method and the "exit" method in a class. We can simplify some operations through the with statement in combination with the context manager. Use with statement and custom context manager to complete the corresponding operation of the database. The code is ...