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This time, our examples and contents may be a little boring, but I will try my best to simplify each knowledge point. I hope you can be patient: We have seven examples this time, but in general, they can be divided into two parts. First, let's take a look at the first part: Number type and its operation: #DayDayUpQ1.py this small program is ...

Introduction to threads and processes Thread: an application that runs in memory. Each process has its own independent memory space. A process can have multiple threads. For example, in Windows system, a running XX Exe is a process. Process: an execution task (control unit) in a process, which is responsible for the execution of programs ...

Early installation vue cli installation sudo npm install -g @vue/cli function: vue ui The localhost:8000 page opens automatically mysql installation (optional) Download address: https://dev.mysql.com/downloads/mysql/5.6.html , find the appropriate dmg version to downloadClick dmg to install step by stepConfigure environment variables ( ...

Decrypt wechat applet login authorization to obtain mobile phone number according to Official documents Wechat applet process: According to the interpretation of the official encryption data decryption algorithm: 1. The algorithm used for symmetric decryption is AES-128-CBC, and the data is PKCS#7 filled. 2. The target ciphertext of symme ...

Principle analysis of Spring circular dependency 1. What is circular dependency# When we use Spring, we inject another object into one object, but another object also contains the object. As shown in the figure: Student contains an attribute of teacher; The Teacher contains the attribute of student. This creates a circular dependency. 2. ...

Simple order number creation (php): function generateOrderSn() { $yearCode = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K"]; //Generate rule year (convert to an uppercase letter to shorten the length) + Month (convert to hexadecimal number) + day + after the current timestamp //Several ...

preface This article records the author's journey of learning the recolerview caching mechanism 1, Overview We all know that RecyclerView will not lead to OOM in any case, and this depends on its own powerful recycling and reuse mechanism. How to realize its recycling and reuse mechanism? The author records the analysis process below ...

catalogue 1, Singleton mode 1. What is singleton mode 2. Single case pattern classification 2, Producer consumer model 1. What is the blocking queue 2. Blocking queue in standard library 3. Producer consumer model 3, Timer 1. What is the timer 2. Timer in standard library 3. Implement timer 4, Thread pool 1. What is thread pool 2. ...

This article explains several questions often asked in C + + interview. This article explains the frequently asked questions such as initialization list, inheritance and string through demo. Look at the example below Initialization list //Base class class Base { public: Base() : m_nbase(0), m_nbase2(m_nbase + 100) {} Base(int n) : m_n ...

Java serialization and deserialization Reprinted in https://www.cnblogs.com/9dragon/p/10901448.html 1, Meaning, meaning and usage scenario of serialization Serialization: writing objects to IO streams Deserialization: recovering objects from IO streams Meaning: the serialization mechanism allows the Java objects that realize serialization to ...