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1. Java Memory Model JMM is the Java Memory Model, which defines the abstract concepts of main memory and working memory from the Java level. The bottom layer corresponds to CPU register, cache, hardware memory, CPU instruction optimization, etc. JMM is reflected in the following aspects: Atomicity - ensures that instructions are not affe ...

Handwritten common interview questions Anti shake Principle of anti shake function: the callback is executed n seconds after the event is triggered. If it is triggered again within this n seconds, it will be timed again. There are two situations: Execute immediately after clickingNon immediate execution after clicking // Non immediate exec ...

1. Process knowledge points The process in the operating system is the process of one-time execution of the program and the basic unit of dynamic execution of the operating system; Whenever a new process is created, the operating system will assign a unique identifier to the new process to facilitate subsequent management of the process. The ...

Python+selenium to realize automatic hospital registration In some hospitals, some experts Daniel's number is always "No. 1 is difficult to find", and the ticket is basically empty for seconds. In view of this situation, small partners who master certain technology can register using automatic methods First, declare that the script ...

A lot about node has been introduced earlier JS theoretical knowledge, but lack of practical combat. Actual combat is still more important. Therefore, I hope to record these basic knowledge and key points of actual combat of the project like thinkPHP before, which can be easily read by myself and shared with you. If there is anything wrong, ...

1, Here Document interaction free 1.1 definition of interaction free Provides a list of commands to interactive programs using I/O redirection As an alternative to standard input, it can help script developers not use temporary files to build input information, but directly produce a file in place and use it as standard input for commands. ...

1 Overview Data reading and writing can be regarded as a special case of Event mode. The continuously sent data blocks are like events. Reading data is a read Event, writing data is a write Event, and data block is the information attached to the Event. Node provides a special interface Stream for such situations. stream is a way of handl ...

1. Introduction to jQuery JavaScript+Query (query), which is a js class library to assist JavaScript development. Its core idea is write less, do more, so it realizes many browser compatibility problems. jQuery is free and open source. Its syntax design can make development more convenient, such as operating document objects, selecting DOM el ...

Design idea: filter according to the sensitive thesaurus file to check whether the input text contains sensitive words. So as to filter out the relevant sensitive words.[read the full text]Import application related modules.import os import logging import sysImport modules related to UI interface.from PyQt5.QtWidgets import QApplication,QWidget ...

1, Front end routing concept By changing the URL, the page view is updated without re requesting the page. 2, Vue router two modes Updating the view without re requesting the page is one of the cores of the front-end routing principle. At present, there are two main ways to realize this function in the browser environment: Hash - de ...