Programmer Group

We take jdk1.7.0_80 as an example to analyze the HashMap source code. Catalog 1, Source code analysis 1.1 important properties of HashMap 1.2 analytical PUT method 1.3 analyze resize method 1.4 parse GET method 2, Problem summary 2.1 how does the rounduptopower of 2 (toSize) method realize to find ...

I'm trying to create a fast 2D point inside the polygon algorithm for hit testing (for example, Polygon.contains(p:Point)). Suggestions for effective technology will be appreciated. #1 building The C version of nirg's answer is here: I only share the code. This can save some time. public static bool IsPointInPolygon(IList<Point> ...

vue component classification I. Introduction The reason why I wrote this article is that I interviewed dozens of people as an interviewer some time ago. One of the questions is "what are the component classifications of vue? ", it's surprising that most people only answer global components ...

A * search algorithm of Routing module The result of Routing module is the basis of generating reference line in Planning module, which is generally referred to as global path Planning. In Routing module, the core algorithm is to generate global path through A * algorithm, besides abstracting the map ...

Conditional control statement if else First, let's take A simple example: design A program to compare the sizes of two numbers A and B. If A and B are not equal, print the values of the larger numbers. If they are equal, print A. The Python code is as follows: if A >= B: print('The larger n ...

Discussion on cache, buffer and swap caused by free $ free total used free shared buffers cached Mem: 8062624 7910056 152568 0 5232 964468 -/+ buffers/cache: 6940356 1122268 Swap: 4194296 2592660 1601636 total: the ...

throw Throw is used to throw objects of specific exception classes, generally used in method bodies. When to use: throw an exception object to remind the programmer when the written code does not meet certain conditions and the program cannot run. Python like raise public class Student { private int ...

KNN overview K-nearest neighbor algorithm is a basic classification and regression method. We only discuss k-nearest neighbor algorithm in classification. A word summary: near Zhu is red, near Mo is black! Working principle: there is a sample data set, also known as a training sample set, and eac ...

In the last article, I mainly shared< How Webpack separates style files >css preprocessor is a program that allows you to generate css through preprocessor's own unique syntax. css preprocessing refers to that we often use some style precompiled languages in development, and then convert these pr ...

Everyone is not new to Edittext. I won't say much here. I'll go straight to the topic. I'm just writing this article to record some tips for using Edittext: 1. Limit input range method 1: /** * Limit the range of input numbers */ public class RegionNumberEditText extends EditText { private Context context; private i ...