SpringBoot learning seckill II. jsr303 calibrator

Form verification is an indispensable link when we submit a form. The common verification method is to judge each parameter separately, but this is not only troublesome, but also if we write too many if parameters, the code will be bloated and the readability will be poor. Take login as an example, supp ...

Posted on Sat, 22 Feb 2020 09:33:57 -0500 by plazz2000

New feature 8 of JDK8 -- parallel flow and Fork/join framework

The streams mentioned above are all serial streams, which are executed on a thread. Next, we introduce two ways to obtain parallel flow 1. Get parallel stream directly Parallel stream is actually a parallel execution stream. It can improve the execution speed of multithreaded tasks through the defa ...

Posted on Sat, 22 Feb 2020 05:42:02 -0500 by jaydeesmalls

Discussion on USB device configuration interface setting endpoint descriptor

Article directory Reference resources objective Overview Detailed introduction USB Device Framework Standard USB Descriptor Definition 1. Device descriptor (struct USB? Device? Descriptor) 2. Structure USB config descriptor 3. Struct USB interface Assoc descriptor 4. Struct USB? Interface? Descript ...

Posted on Sat, 22 Feb 2020 05:12:08 -0500 by pagie

Common sorting algorithms and their code implementation and related problems

Algorithm learning notes - sorting This is a part of the notes that have been sorted out recently in the learning process. There is no picture demonstration. For more vivid display, please see this Daniel's sorting blog. Animation demonstration of sorting algorithm Some common array sorting metho ...

Posted on Sat, 22 Feb 2020 04:41:10 -0500 by kurdishvoice

Definition and use of Java learning notes

1, Method definition In many cases, it is possible to execute some code repeatedly. Methods are also called function s in some books. It should be noted that there is a precondition for this method definition: the method is defined in the main class and directly called by the main method. Basic defi ...

Posted on Sat, 22 Feb 2020 04:17:30 -0500 by ast3r3x

Python 3 standard library: heapq heap sorting algorithm

1. heapq heap sorting algorithm Heap is a tree data structure, in which the child node and the parent node have an orderly relationship. Binary heap can be represented by an organized list or array, where the child elements of element N are located at 2*N+1 and 2 * N + 2 (the index starts from 0). This layout allows the heap to be reorganized i ...

Posted on Sat, 22 Feb 2020 01:50:56 -0500 by discorevilo

DL-Pytorch Task02: Text Preprocessing; Language Model; Cyclic Neural Network Foundation

Catalog Text Preprocessing Read in Text participle Word Separation Using Existing Methods Language Model n-ary grammar Language Model Language Model Dataset Sampling of time series data Basis of Circulating Neural Network one-hot vector Initialize model parameters Define Model Clipping gradient ...

Posted on Fri, 21 Feb 2020 22:28:45 -0500 by umol

Design Mode_Singleton Mode

An overview of the singleton pattern 1. Core: Ensure that a class has only one instance and provide a global access point to that instance. 2. Advantages of the singleton mode: 1) The performance overhead of the system is reduced because the singleton mode only produces one instance object.When th ...

Posted on Fri, 21 Feb 2020 21:04:40 -0500 by khurramijaz

Nodejs Column - Modularization of Nodejs (module.exports and exports principles, Nodejs modularization principles)

Modularization of Nodejs In the process of our daily web development, modularization can not be lost. Each of them has its own way of implementation. Noejs follows the commonjs specification. Think of every file as a module If a module needs to expose some data or functionality for use by other mo ...

Posted on Fri, 21 Feb 2020 19:59:30 -0500 by Skepsis

HTML+JS+CSS to realize student information management system

HTML+JS+CSS to realize student information management system Effect page increase Delete change check Page turning Code difficulty Difficulty 1 Difficulty 2 Difficulty 3 Difficulty 4 epilogue Effect If you don't speak much, you can directly see the effect. This code is complex. I hope you ca ...

Posted on Fri, 21 Feb 2020 10:23:27 -0500 by Copernicus