Operational Questions of Shandong University of Science and Technology on May 18, 2020

Operational Questions of Shandong University of Science and Technology on May 18, 2020 **Title 1: **Square, Rectangle, Cube Two Description Give the length of Square, Rectangle, Cube, Cuboid and find the area. Squares and cubes have equal sides, so you only need to store one side length. A rectangle s ...

Posted by hmvrulz on Wed, 20 May 2020 10:35:07 -0700

VHDL implementation of IIC bus random reading & ping pong operation of FIFO & HM62256 test & customized IP core

Blog introduction This blog is the content of hardware description 3 of digital system experiment in my sophomore year. It is recorded here to prevent loss. The contents are as follows: Timing analysis of IIC serial bus VHDL programming design special state machine and two pieces of asynchronous FIFO to realize ping-pong operation Desi ...

Posted by sn0n on Wed, 20 May 2020 06:19:20 -0700

double cannot be used as a money operation

float and double can only be used for scientific calculation or engineering calculation. In business calculation, we need to use java.math.BigDecimal . I heard that a colleague said that a friend of his had been used by hackers because he used double to calculate money, resulting in a lot of losses. Let's talk about this. brief introduction ...

Posted by chrisredding on Tue, 19 May 2020 02:58:25 -0700

Using Nginx to record and display the TOP 20 Web interface with slow response

I believe that many small partners have seen the response time and real-time display function of url interface in some commercial products. It can be understood that the slow query of web interface and the slow query of sql have the same magic, but if you want to do it, you have no way to start and don't know how to realize this function, so to ...

Posted by Jak on Mon, 18 May 2020 23:19:14 -0700

Understanding Go language object-oriented programming: interface and polymorphism

Hi, Hello, this is Mingo. During my time of learning Golang, I wrote detailed study notes on my personal WeChat official account "Go programming time". For Go language, I am also a beginner, so writing things should be more suitable for students who are just in contact. If you are just learning Go language, do not pay close attention ...

Posted by elementaluk on Mon, 18 May 2020 21:49:47 -0700

Integrating sharding JDBC to realize data desensitization in JPA project

introduction In the previous blog post, the database desensitization scenario and scheme have been completely introduced. The sharding JDBC open source project from Jingdong Digital Technology Co., Ltd. has realized this function transparently through the way of data source intermediate agent. However, although the function has been realized, ...

Posted by rocksolidsr on Mon, 18 May 2020 20:31:28 -0700

I recommend it StringUtils.isBlank

In our daily development, void judgment should be the most commonly used operation. Therefore, commons lang3 package is always necessary in the project. This package provides us with two methods for void determination, namely StringUtils.isEmpty(CharSequence cs) and StringUtils.isBlank(CharSequence cs). Let's see the difference between the two ...

Posted by febrarian on Mon, 18 May 2020 08:05:55 -0700

Teach you how to implement a Java based distributed lock service

In modern programming languages, programmers who have been exposed to multithreaded programming have a certain understanding of locks. In short, the lock in multithreading is a mechanism to ensure the consistency of shared resources when multiple threads modify shared resources in multithreading environment. We will not expand here. In the dis ...

Posted by cuboidgraphix on Mon, 18 May 2020 03:25:12 -0700

Detailed explanation of ASP.NET Core Middleware

What is Middleware? Middleware is software that is assembled into application pipelines to process requests and responses. Each component: Choose whether to pass the request to the next component in the pipeline. You can perform work before and after calling the next component in the pipeline. Request delegates are used to build the requ ...

Posted by Headwaters on Mon, 18 May 2020 02:40:41 -0700

java Concurrent programming-CountDownLatch and Cyclic Barrier differences in internal implementation and scenarios

Preface CountDownLatch and Cyclic Barrier are two important tool classes for concurrent java programming. They are widely used in many multithreaded concurrent or parallel scenarios.However, each has its own emphasis on the internal implementation and use scenarios. Internal implementation differences The former relies more on classical AQS m ...

Posted by phpconnect on Sun, 17 May 2020 12:13:23 -0700