Programmer Group

1. Agent mode Agent pattern is a design pattern that is easy to understand. Simply put, we use proxy objects instead of accessing real objects, so that we can provide additional function operations and expand the functions of the target object without modifying the original target object. The agent mode contains three roles: Abstract topic r ...

1, Atomic operation class in JUC 1. Introduction to atomic classes in JUC What is atomic operation? atomic means atom in Chinese. In chemistry, we know that atoms are the smallest unit of general matter and are inseparable in chemical reactions. Here, atomic means that an operation is non interruptible. Even when multiple threads execute to ...

1. Syntax of mapping file XXMapper.xml: <mapper namespace="cn.kgc.mspper.UserMapper"> <select id=" findCount " ... ...... </select> </mapper> 1.1 namespace: namespace The name of a namespace must have the same name as an interface 1.2 id: unique identifier in namespace** The method in the interface corresponds to ...

Model introduction Prototype Pattern is used to create duplicate objects while ensuring performance. This type of design pattern is a creation pattern, which provides the best way to create objects. In a software system, it is sometimes necessary to create a certain type of object many times. In order to simplify the creation process, you can ...

2021SC@SDUSC preface Starting with this blog, we will introduce several encoders and decoders that have been implemented in netty. In this blog, we will introduce netty's LineBasedFrameDecoder class, which divides messages into different parts based on line breaks. 1, LineBasedFrameDecoder package io.netty.handler.codec; import io.netty ...

A personal email website (built based on SpringBoot environment) At present, you can only send some simple content. If you have any good suggestions, you can comment!! I am still studying Source address: https://gitee.com/mehao123/sendMail/tree/master effect Main interface before login Login interface Main interface after login Se ...

[Day11] three times a day subject NC58 finds two switching nodes (esay) in the binary search tree describe A binary tree was originally a search binary tree, but two nodes changed their positions, so that the binary tree is no longer a search binary tree. Please output the values of the two wrong nodes in ascending order. (each node has ...

Algorithm efficiency There are two kinds of algorithm efficiency analysis: Time efficiency,Space efficiency. Time efficiency - > time complexity Space efficiency - > space complexity. Time complexity mainly measures the running speed of an algorithm, while space complexity mainly measures the additional space required by an algorithm I ...

Previous review: Read Spring source code (I) -- overview of refresh() method Read the Spring source code (II) -- about the design patterns used in Spring Dynamic proxy portal (two good articles, moving over): What is the role of Java dynamic proxy? Implementation and principle of java Dynamic agent The last article combed the design patte ...

catalogue 1. Description of single source shortest path problem 2.Dijkstra algorithm idea 3. Specific case analysis 4. Specific code implementation   1. Description of single source shortest path problem ① Given weighted digraph G =(V,E). Where V is the set of all vertices in the graph. E is the set of all edges in the graph, and the ...