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1, RGB tricolor Think back to junior high school physics: Three primary colors: all colors in nature can be obtained by the combination of red, green and blue (RGB) color frequencies with different intensities. White includes all colors To see the color of an object is the color reflected by the object. In other words, it is the color that ...

Analysis of SpringBoot startup process It has been two years since we used spring boot for development, but we haven't thoroughly understood its relevant source code. In the near future, we can carefully read and analyze the relevant source code. In this paper, we start our analysis and study from the s ...

After reading this article, you will get Learn about the Spring container initialization process The best practice of ThreadLocal in Spring Answer the Spring container initialization process in the interview introduction Let's start with a simple and common code <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING ...

Python commonly used modules are calendar time datetime timeit os shutil zip math string Theoretically, all the above modules should be imported first, and string is a special case calendar, time, datetime refer to Chinese meaning calendar Calendar related modules Import before use import calen ...

position:sticky It's CSS The new location attribute in 3.0 can be said to be a combination of relative location and fixed location. It is mainly used for monitoring scroll events. In short, in the rolling process, when the distance between an element and its parent element meets the requirements of s ...

Boot map is an essential part in the development of iOS. Many app s will have a customized open screen ad map after the boot map. Click the ad map to jump to the corresponding page of the ad map. Today, I'd like to share with you how to add this ad map and click the jump of ad map. This ad map is imp ...

Dijkstra algorithm: Basic ideas: Can't understand? It doesn't matter. i will take you to understand the algorithm through specific problems Problem Description: Find the shortest way from business to school Multiple sets of inputs, for each set of data. Input N and m in the first line to indicate t ...

Title Link: Click to view Main idea: give a tree with root, the root node is point 1, each node has a weight val and two attributes b, c. The weights of attributes b and C are not 0, i.e. 1. Now you can select a node x, and then select any k nodes from the subtree. Reassign attribute b of these K no ...

catalog Choose the appropriate flow operation mode Be careful to execute immediately Will LINQ to Objects degrade code performance Different methods What has been learned The cost of using LINQ to Objects Performance and simplicity: can't fish and bear paw have both LINQ's advantage is not to provide any new functions, but to enable us t ...

In Android, attribute animation is a very interesting function to control the animation effect of parameter transformation Compared with gif image, animation controls need to save space and increase response speed main points: (1) Use PercentLayout to set the size of custom controls (2) The two important functions of attribute animation are ...