Programmer Think

As shown in the following code, a is a local variable in the stack frame. When a = null, because a acts as a GC Root, a is disconnected from the instance new Test(), so the object will be recycled. publicclass Test { public static void main(String[] args) { Test a = new Test(); a = null; } } 2. The object referenced by the ...

This issue is a crawler and data analysis of the popular online drama "fierce knife in the snow". The total number of crawlers is 1W comments, which is very suitable for newcomers to practice. In the case, the emotional text analysis of comments is specially added for your reference. Crawler: since Tencent's comment data is encap ...

prefaceAs we all know, Binder is the main interprocess communication suite in the Android system. More specifically, many articles call it Binder driver. Why is it a driver? What is the driver? Let's uncover it step by step from the Binder in the kernel from the bottom up. This article focuses on helping readers have a brief understanding of Bi ...

prefaceThis article is not written to analyze how the Handler is used. The purpose is to look at the evolution of the Handler from a design point of view and why there are four classes: looper, messagequeue, Handler and message.I The nature of thread communication?The main difference between threads and processes is that threads share memory. I ...

Hello, I'm spicy.   Today, I'll sort out some Python exercises [including answer analysis]. You can try it yourself first, and then check with the answer analysis at the end of the text. I hope it can help you. Exercises 1. Use the formatted output of the string to complete the display of the following business cards ==========My busin ...

Click on "end of life", pay attention to the official account. Daily technical dry goods, delivered at the first time!   I've been confused about the two commands su and sudo before. Recently, I specially searched the information in this regard, and finally figured out the relationship and usage of the two. This article systematically ...

Regular expression, a very old and powerful text processing tool, can quickly realize a very complex business logic with only a very short expression statement. Mastering regular expressions can greatly improve your development efficiency. Regular expressions are often used to verify fields or arbitrary strings, such as the following JavaScrip ...

Gin framework   Basic installation 1. First, you need to install Go (version 1.10 + is required), and then you can use the following Go command to install Gin. go get -u github.com/gin-gonic/gin 2. Import it into your code: import "github.com/gin-gonic/gin" Usage example: package main import ( "net/http" "github.com/ ...

The automatic configuration provided by Spring Boot is very powerful. In some cases, the automatic configuration function may not meet our needs. We need to customize the configuration. At this time, we need to exclude / disable the automatic configuration of some classes of Spring Boot. For example, data sources and e-mail provide automatic c ...

JWT can be understood as an encrypted string, which consists of three parts: header, payload and signature It is used by the header and payload encrypted by base64 The JWT string is formed by connecting the strings, then encrypting them with salt secret combination through the encryption method declared in the header, and then forming the JWT ...