Programmer Think

In the design pattern, there is a pattern that provides a visitor class that can change the execution algorithm of our target object class, which decouples the data structure from the data operation. Introduction to visitor mode Visitor patterns are behavioral patternsVisitor pattern provides a visitor class that can change the execution algo ...

Step 1: write camchain Yaml. For specific parameters, refer to the yaml file obtained above. No parameters can be deleted. cam0: camera_model: pinhole distortion_coeffs: [0.3741003900681439, -0.3881978058678547, 3.1716618459908745, -6.001063348025562] distortion_model: equidistant intrinsics: [390.758503853357, 391.25816160400524, ...

preface This article is based on KITTI data set training yolov5. Friends can divide the data set completely according to my steps (strictly follow the directory structure I listed, there will be no problem), so as to successfully train yolov5 in KITTI. If you strictly follow my directory structure, you don't need to modify any sentence in the ...

Write before: Today, let's learn about the stack structure. The stack can also be called directly in C + + STL, but we can use C + + to realize the stack structure. Definition of stack The stack meets the principle of "first in and last out", that is, it can only be inserted and deleted from the tail. The implementation of the sta ...

Article catalogue preface1, Analyze the composition of Taobao URL2, View the web source code and extract information with re library 1. Check the source code2.re database extraction information 3: Function filling4: Main function filling5: Complete code preface This paper simply uses python's requests library and re regular expressio ...

Inheritance is one of the most important concepts in object-oriented programming. Inheritance allows us to define one class according to another, which makes it easier to create and maintain applications. At the same time, it is also conducive to reusing code and saving development time. When creating a class, programmers do not need to comple ...

1, EventsBefore understanding what is the event flow in js, let's first understand what is the event flow in js. Interpretation by reference to W3c HTML events are what happens to HTML elements When using javaScript in HTML, javaScript can deal with these events Examples of common events:onClick (mouse click element)onmouseover (mouse in elem ...

Source: http://t.cn/ESocliD Clean up resources in Finally or use the try with resource statement Use Finally Try with resource statement in Java 7 Give accurate exception handling information Record the exceptions you specified Throw an exception using a descriptive message Catch specific exceptions first D ...

Library address: https://github.com/JavaNoober/BackgroundLibrary In order to solve a large number of style files in the project, such as shpre, selector and other files, the BackgroundLibrary library is introduced. Let's introduce the use of BackgroundLibrary. Advantages: it reduces the creation of a large number of xml filesDisadvantages: yo ...

An InterruptException occurred when the RocketMQConsumer service was shut down Background summary The main problem is the version upgrade Old version core rocketmq dependency <dependency> <groupId>org.apache.rocketmq</groupId> <artifactId>spring-boot-starter-rocketmq</artifactId> <version>${ve ...