Programmer Think

1. Cache What is Cache? There is temporary data in memory. Put the data frequently queried by users in the cache (memory), and users do not need to query the data from the disk (relational database data file) but from the cache, so as to improve the query efficiency and solve the performance problem of high concurrency system. 2. Why c ...

Day 26 of learning big data - Supplementary IO stream and multithreading (1) Summary of multithreading: 1, Overview of multithreading: Process: The running program is an independent unit of the system for resource allocation. Each process has its own memory space and resources Thread: It is a single sequential control flow of a process, ...

1, toString method in Object class: java.lang.Object class is the root class in the Java language, that is, the parent class of all classes. All method subclasses described in it can be used. When an Object is instantiated, the final parent class is Object. To create a Person class: public class Person { private String name; private ...

Source code (code cloud): https://gitee.com/yin_zhipeng/implement-_springmvc_of_myself.git 1, Handwritten spring MVC For length reasons, I put it in this article https://blog.csdn.net/grd_java/article/details/123000127 2, Spring MVC advanced application Spring MVC Encapsulate the servlet and simplify the framework of servlet developmen ...

1. Introduction to maven https://mirrors.tuna.tsinghua.edu.cn/apache/maven/ 2. Install mvn # java -version java version "1.8.0_211" Java(TM) SE Runtime Environment (build 1.8.0_211-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode) # cd /data/ # wget https://mirrors.tuna.tsinghua.edu.cn/apache/maven/maven-3/3.6.1/b ...

If you are Xiaobai, this set of information can help you become a big bull. If you have rich development experience, this set of information can help you break through the bottleneck 2022web full set of video tutorial front-end architecture H5 vue node applet Video + data + code + interview questions. Write the catalog title here Getting st ...

Resource constraints Time limit: 1.0s memory limit: 512.0MB Problem description Given an n*n chessboard, there are some positions in the chessboard that cannot put queens. Now put n black queens and n white queens into the chessboard, so that any two black queens are not in the same row, column or diagonal, and any two white queens are not i ...

Python wechat ordering applet course video https://edu.csdn.net/course/detail/36074 Python actual combat quantitative transaction financial management system https://edu.csdn.net/course/detail/35475 Detailed explanation of currentThread currentThread method is a static method of Thread class, which is used to obtain the currently running c ...

717. 1-bit and 2-bit characters [simple question] [daily question] Idea: Traverse the bits array from front to back. If the current element is 1, the second character, whether 10 or 11, starts with 1, so you can be sure that the current element and its next element form the second character, i+= 2 directly; The bits array has only 0 and 1. ...

CSDN blog expert is a high-quality creator in the Java field focusing on various technical fields. Wechat search [Chen Pi's JavaLib] and learn more technical articles, interview materials and technical e-books in time after paying attention. preface Suppose you were asked to define a method for others to call. Its function is to travers ...