Programmer Think

Recently, I went out for an interview and wrote some technical points about Mybatis in my resume, so the interviewer began to ask me constantly. This article specially records some problems encountered in the interview. What is Mybatis Mybatis is a persistent SQL framework that encapsulates SQL to a certain extent. It encapsulates the commonl ...

⭐ New pit in winter vacation -- daily question notes of code Fox 😢 The winter vacation is about to expire 😢 6007. Maximum sum of array - Hard - game 280 weekly question 4 Give you an integer array nums with length N and an integer numSlots, satisfying 2 * numSlots > = n. There are a total of numSlots baskets numbered 1 to numSlots. Y ...

Concurrent locks protect multiple resources For mutexes, the relationship between protected resources and locks is generally many to one, so how to use a mutex to protect multiple resources? First, you need to distinguish whether there is an association between multiple resources. There is no association between multiple resources There is ...

I Build a simple microservice project 1. Evolution from monomer architecture to microservice architecture The single architecture we first came into contact with has only one project for the whole system. The packaging is often made into a war package and then deployed to a single tomcat. This is the single architecture, as shown in the figur ...

Today, all the train tickets have been bought. I feel closer and closer to Xiagong 🤗， Yada 😭😭😭😭😭 1. jsp first entry 1.1. What is jsp 1. The full replacement of jsp is java server pages, which is the server page of Java 2. The main function of jsp is to return the data of html page instead of Servlet program 3. Because it is very com ...

Original website: brief introduction explain This article introduces the usage of CGLIB dynamic agent with examples. principle CGLIB implements proxies for classes. The principle is to generate a subclass of the specified target class and override its methods to achieve enhancement. However, because inheritance is adopted, the class mod ...

JVM learning This article is based on JVM [produced by dark horse programmer] Notes made during instructional video learning 1, What is a JVM definition Java Virtual Machine, the running environment of JAVA program (the running environment of JAVA binary bytecode) benefit Write once and run everywhereAutomatic memory management, garbage c ...

Qos (Quality of Service) concept: When the network is congested, all data streams may be discarded; In order to meet the requirements of users for different applications and different service quality, the network needs to be able to allocate and schedule resources according to the requirements of users, and provide different service quality ...

The string splicing methods discussed in this paper are as follows: "+" sign, StringBuilder, StringJoiner and String#join, which are compared and analyzed to explore the best practices.conclusionThe following content is boring, so let's start with the conclusion:The string splicing methods discussed in this paper are as follows: &quot ...

Basic use of synchronized Object lock Custom object lock /** * Object lock example 2 */ public class SyncObjLock2 implements Runnable{ private static SyncObjLock2 instance=new SyncObjLock2(); private Object lock1=new Object(); private Object lock2=new Object(); /** * You can see that using sync will cause threads to ...