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1. Package Why do I need a bag 1. Managing classes through packages is similar to managing blockbusters through folders. 2. The emergence of package provides a multi-layer namespace for classes, that is, the complete class name is "package name + class name".Note: in different packages, we can define classes with the same name; Howev ...

Welcome to the official account [the front end of Pinellia], reply [algorithm], get all kinds of algorithm information. explain The two-color Hanoi Tower and the three-color Hanoi tower are derived from the Hanoi Tower rules introduced earlier. The purpose of the two-color Hanoi tower is to move the ring position at the top left of the fi ...

preface: This article belongs to the article in the Android source code exploration column. The list of all articles in the column is linked as follows. You are welcome to read it. Android source code exploration [here is picture 001]https://blog.csdn.net/rzleilei/category_6506586.html?spm=1001.2014.3001.5482 I * * introduction to Handler me ...

Flex flexible layout 1. Development history of flex The W3C put forward the concept in 2009, but the word flex is not officially available. display:box was used at that time; Represents a flexible layout In 2011, browser manufacturers decided to use flexbox to describe its layout characteristics In 2015, W3C officially revised it to flexbox ...

preface Code demonstration environment: Software environment: Windows 10 Development tool: Visual Studio Code JDK version: OpenJDK 15 Although these codes were written more than 10 years ago, they can still run normally in the modern operating system and the latest open source version of Java. Interfa ...

What is lombok Lombok project is a Java library, tool library, which will automatically generate code in the editor or construction tool, so as to make your Java code more concise. Instead of generating get, set and other methods for each variable, it will also generate a fully functional Builder, which has automatically logged variables, and ...

background Follow the previous article When developing the electron ic desktop, you will encounter various pits. Let's summarize. Anti virus software damage inspectionPrevent debug debuggingClient crash reportImprove client startup speedPerformance monitoring and analysisDelay loading moduleUniform scroll bar stylebrowserWindow error lis ...

The content shared in this article comes from the book "learning OpenCV 4: Python based algorithm practice", which is as follows: Chapter 1 OpenCV Quick start; Chapter 2 image reading and writing module imgcodecs； Chapter 3 core library module core； Chapter 4 image processing module imgproc(1) (a); Chapter 5 image processing module ...

transient As we all know, as long as an object implements the Serializable interface, the object can be serialized in two ways: - implement Serializable (automatic serialization) - implement Externalizable (there is no automatic serialization, you need to specify so and so serialization yourself. See the following case for specific use) 　　 A ...

How to alternate the communication between threads? Threads A and B operate on the same variable numbe=0 /** * How to alternate the communication between threads? * Threads A and B operate on the same variable numbe=0 * A++ * B-- * <p> * Question: * 1.It is safe when there are only two threads, one more + + and one more */ ...