Programmer Group

👉 About the author As we all know, life is a long process, constantly overcoming difficulties and constantly reflecting on the process of progress. In this process, there will be a lot of questions and thoughts about life, so I decided to share all my thoughts, experiences and stories in order to find resonance!!! Focus on Android/Unity an ...

1, Context switch:          In concurrent programming, it is not that the more threads, the higher the efficiency. Too few threads may lead to insufficient utilization of resources. Too many threads may lead to fierce competition for resources, and then frequent context switching will cause additional ov ...

Take qq mailbox as an example To realize the mail function on the network, there must be a special mail server The mail server is similar to the real post office. It is mainly responsible for receiving the mail delivered by the user and delivering the mail to the e-mail of the mail recipient. 1. Zhang San connects to the SMTP server thr ...

catalogue recursion The concept of recursion Recursive call mechanism Print problem code   Operation results Factorial problem     Operation results Explanation of recursive call mechanism ​ Recursive call rule What kind of problems can recursion solve What kind of problem is recursion used to solve   Importan ...

Servlet realizes login function Title: Create a project, use servlet a to complete a login page, and when the user enters the user name and password on the login page, send it to servlet B, After servlet B obtains the user name and password, it creates a correct user name and password in the Web.xml file as shared static data in advance Se ...

1. Background In daily development, delayed task is an unavoidable topic. In order to achieve the purpose of delay, there will be different solutions in different scenarios. The awareness of the advantages and disadvantages of each scheme determines the effectiveness of architecture decision-making. In this article, taking the e-commerce ...

This article was not originally created by the blogger. When the blogger learned the underlying principles of Spring, he felt that this article was very profitable. He read it several times and had different experiences each time, so he wanted to record it through the blog. If there is infringement, it shall be deleted. The core of Spring ...

Heap (priority queue) Time complexity: The time complexity of initializing heap building is O(n) Heap sort rebuild heap O(nlogn) PriorityQueue small top heap Small top heap: the weight of any non leaf node is not greater than the weight of its left and right child nodes Constructor constructor Function introductionPriorityQueue()Create a ...

1 Introduction      Flowable Official website address: https://flowable.com/open - source/      Flowable The project provides a series of compact and efficient open source business process engines. They provide a workflow and business process management (BPM) for developers, system administrators, and business users )Platform. ...

1. Introduce pom dependency Because almost all web projects use the interceptor, the interceptor object introduced into the next web package is also in the web packagethymeleaf: view the static interface; <!--introduce springboot Parent project dependency--> <!--Introduce dependency: It can be omitted version Ta ...