Programmer Group

Why use regular expressions? Regular matching can realize fuzzy matching. In actual development, it is often necessary to match a certain range of data, such as verifying whether the mailbox entered by the user is correct; In addition to @ and other fixed characters, we can't measure and count the other characters we input. At this time, ther ...

Java process control 02 -- sequence structure and selection structure Sequential structure The basic mechanism of Java is the sequential structure. Unless otherwise specified, it will be executed sentence by sentence in order; Sequential structure is the simplest algorithm structure; Between statements and between boxes, it is carried ou ...

JDK dynamic agent The dynamic proxy of JDK only allows proxy interfaces Important classes and interfaces Proxy and InvocationHandler The proxy.newproxyinstance (classloader, loader, class <? > [] interfaces, invocationhandler h) method creates a proxy object for the target object After obtaining the proxy object of the target object, th ...

  ☀️ My home page: YYDataV ☀️ Welcome to praise 👍 Collection ⭐ Message, welcome to communicate catalogue ❤️ Effect display ❤️ 1, Scheme architecture 1. Map module 2. Key technology 2, Coding implementation (based on length and readability, some key codes are shown here) 1. html page layout 2. Import map file 3. Draw map bubble ...

preface 1, Experimental content 2, Experimental topology 3, Implementation steps   1. Dynamic routing RIP configuration   2. Divide different network segments   3. Configure single arm circuit for R1 and R4 respectively   4. ACL configuration   preface Experiment 1, Experiment 4, Experiment 5 and three ...

To understand the development background of Spring Boot, we have to start with the release of Spring Framework version 1.0 in 2004. However, we all use the spring framework from the beginning of learning Java, so we don't expand too much.With more and more enterprises and individuals using the Spring Framework for development, Spring has slowly ...

What is Timer? Timer is a tool used by threads to schedule tasks for future execution in background threads. Tasks can be scheduled for one-time execution or repeated periodically. Corresponding to each Timer object is a separate background thread for sequentially executing tasks for all timers. The timer task should be completed soon. If a tim ...

The essence of optimization The purpose of source code optimization of marriage and love system is to ensure the robustness of the program. Sometimes it is not necessary to spend too much time when the program can run normally. Cyclic optimization Take an example, please pay attention to this code, the source code of marriage and marriage sy ...

Summary: Dynamic Language: Python is a dynamic language, with the duck model at the bottom: when you see a bird walking like a duck, swimming like a duck, and calling like a duck, it can be called a duck. In the duck type, the focus is not on the type of object itself, but on how it is used. In programming, duck typing is a style of dynamic ty ...

I. Installation.Net Core Refer to official documents: https://www.microsoft.com/net/core#linuxcentos 1. Add dotnet product Feed Before installing.NET Core, you need to register for Microsoft Product Feed. This only needs to be done once. First, register the Microsoft signature key, then add the Microsoft product Feed sudo rpm --import https ...