Category:Informal Essay

  • tree

    Time:2021-12-30

    tree Basic concepts Logical structure Basic concepts A tree is a finite set of N nodes. When n = 0, it is calledEmpty tree。 Trees are a kind ofRecursive definitionData structure. Conditions for non empty tree: Yes and only oneRoot node n> 1, the other nodes can be divided into m (M > 0)Disjoint finite […]

  • Object – inheritance

    Time:2021-12-29

    inherit Class screenshot code Parent class package com.oop.demo04; //In Java, all classes inherit the object class directly or indirectly by default //Person: parent class public class Person { //public //protected //default //private private int money = 10_0000_0000; public void say() { System. out. Println (“speak”); } public int getMoney() { return money; } public void […]

  • Instance methods and static methods call each other.

    Time:2021-12-29

    1. Can instance methods be called directly in static methods? 2. Can static methods be called directly in instance methods? In fact, we only need to understand a reason. In the case of Java, we must have the main body. The method is not a first-class citizen. It can not be directly used as a […]

  • Raft algorithm

    Time:2021-12-29

    Raft algorithm According to the official documents, a raft cluster contains several nodes. Raft divides these nodes into three states: leader, follower and candidate. Each state is responsible for different tasks. Under normal circumstances, nodes in the cluster have only two states: leader and follower. • leader: responsible for the synchronous management of logs, processing […]

  • 1、 Get ef

    Time:2021-12-29

    Reference website:https://www.cnblogs.com/bridgew/p/12709063.html 1. Open nuget package manager console 2. Select the default project (the project to import EF) and enter the command: install package entityframework 3. If the import is successful, there will be the following two references in the reference 2、 Add entity data model 1. Add a new item and select ADO Net […]

  • After discovering the loopholes of network products, the upstream developers shall be notified immediately and the downstream users shall be notified in time

    Time:2021-12-29

    [regulations on the management of network product security vulnerabilities · Article 7] Network product providers shall perform the following network product security vulnerability management obligations, ensure that their product security vulnerabilities are timely repaired and reasonably released, and guide and support product users to take preventive measures: (1) After discovering or learning that there are […]

  • Basic implementation of limit

    Time:2021-12-28

    Reference website:https://www.cnblogs.com/nickup/p/9758691.html Generally, the client queries the data in the database by passing two parameters, pageno (page number) and PageSize (number of entries per page). When the amount of data is small (tuple hundred / thousand), the client uses the data provided by mysqllimitTo solve this problem: Received client {pageno: 1, PageSize: 10}select * from […]

  • How to use static methods and static variables in the project

    Time:2021-12-28

    Use static methods to complete some tool classes: public class Computer {   public static int plus(int i,int j){ return i + j; }   public static int minus(int i,int j){ return i – j; } } How to use it?   Computer.plus(3,2);   Use static variables to complete the definition of some global constant classes with only […]

  • Least mean squares regression (II)

    Time:2021-12-28

    See this article for general LMS algorithm applications. General LMS practical application This paper designs the mathematical theory behind LMS. 1. The Least Mean Squares algorithm (LMS) SDThe steepest descent method studied is a recursive calculationSignal statistics are knownRecursive algorithm of time Wiener filter (knowledge about R och P). The problem is that this information […]

  • IfcDistributionChamberElement

    Time:2021-12-28

    IfcDistributionChamberElement The distribution room element defines a position where the distribution system and its components can be checked, or where the distribution system and its components can pass through. Ifcd distribution room elements are formed volumes used in distribution systems, such as sumps, trenches, or manholes. An instance of an ifcddistributionsystem or ifcddistributionflowelement may be […]

  • Computer crash course Episode 15 Alan Turing

    Time:2021-12-27

    1. Father of Computer Science Born in London in 1912, he showed amazing mathematical and scientific abilities since childhood In 1935, he began to make achievements in computer science He was a master’s student at King’s college, Cambridge Began to solve the problem raised by German mathematician David Hilbert: “decidability problem” Definition of question: is […]

  • Visual Studio ‘cannot start program’ the system cannot find the specified file solution

    Time:2021-12-27

    https://www.bilibili.com/video/av75212012/