Programmer Group

This blog series is a record summary of learning concurrent programming. Due to the large number of articles and the scattered time of writing, I arranged a directory post (transmission gate) for easy reference. Concurrent programming series blog portal Preface As mentioned in the previous article, JMM is the embodiment of memory model specifi ...

I was humiliated by a row of sql interview questions, so sad There is a scenario where there are three products, i.e. 1, 2, 3, and three warehouses, i.e. 01, 02, 03. The three warehouses store three products respectively. The quantity distribution is as follows: Product (PID) Warehouse (SID) Quantity (PNUM) 1 01 10 1 02 8 2 02 11 2 0 ...

Create a new project directory, such as hello world; Create a new cpp file under the directory HelloWorld, such as helloworld.cpp; #include <iostream> #include <vector> #include <string> using namespace std; int main() { vector<string> msg {"Hello", "C++", "World", "from", "VS Code", "and the C++ extension!"}; fo ...

What is abstract oriented programming? I didn't pay attention to it for the first time. I don't think it's very important. But when I go to have a closer look, the function of abstract oriented programming is so powerful. I should sum it up again. Abstract oriented programming, as the name implies, is the programming of a s ...

Quartz has different memory and database modes In memory mode, task information is saved in memory, and it will be lost during shutdown. It needs to be re executed manually. In database mode, task information is saved in database, and the focus is to support cluster RAMJobStore in memory mode and database mode JobStoreTX, RAMJobStore is suita ...

As a common design pattern, singleton pattern is not repeated here. There are nine ways to implement singleton mode, but some of them are defective. In summary, there are four types: 1, Starved Han model /** * @ClassName: Singleton2 * @description: Singleton mode - starved mode (thread safe, but not resource efficient) * @author: edison_Kwok ...

It is a common function to upload files in web applications, but it is more troublesome to upload large files in the traditional way. After all, once the network is abnormal, it is easy to cause file upload failure and need to start again. This article introduces the web file upload function of BeetleX. Its feature is that it supports disconnec ...

aggregate ——Collection is a container provided by java, which can be used to store multiple data. The difference between set and array The length of the array is fixed. The length of the set is variable. The array stores elements of the same type, which can store basic data type values. Collections store objects. And the ty ...

Through the detailed explanation of the previous article, we know that the Dubbo service consumer label dubbo:reference will eventually create a corresponding ReferenceBean instance in the Spring container, and ReferenceBean implements the Spring life cycle interface: InitializingBean. Next, we should look at the implementation of its afterprop ...

As we mentioned in the previous article, when @ Bean annotation is marked on a method, the method return value will be put into the ioc container when the ioc container is started In the development process, there are many package scanning methods. Next, we will introduce two methods: one is based on xml, the other is based on annotation. Let ...