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data structure Basic concept and operation of linear table (I) Mind map 2.1 definition and basic operation of linear table 2.1.1 definitions A linear table is a finite sequence of n (n ≥ 0) data elements with the same data type, where n is the table length. When n = 0, the linear table is an empty table. If L is used to name t ...

reference resources Design mode (V) observer mode Observer mode Type: behavioral A one to many dependency is defined, which allows multiple observer objects to listen to a topic object at the same time. When the state of the subject object changes, it will notify all observer objects so that they can update themselves automatically. UML ...

Callable interface The characteristics of Callable interface are as follows (key points) In order to implement Runnable, you need to implement the run() method that does not return anything, while for Callable, you need to implement the call() method that returns the result on completion.The call() method can throw exceptions, while r ...

catalogue 1. Brief 2. Development environment and tools 3. Background password encryption 3.1 encryption code 3.2 SM3 encryption class (Sm3crypto) 3.3 state secret SM3 tools (Sm3Utils) 3.4 dependence package related to state secrets 4. Login authentication 4.1 front end key codes 4.2 key codes of backend login authentication 4.2.1.SM ...

1. Configparser installation pip3 install configparser 2. Introduction to configparser The python package used to read the configuration file;Generally, this module is used to encapsulate some constants when doing automated testing. For example, database, email, user name and password, project constant, etc;The usage is determined accor ...

@Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { String editable = evPwd.getText().toString(); String regEx = "[^a-zA-Z0-9]"; //Only letters or numbers can be entered Pattern p = Pattern.co ...

The following IP commands add routing table entries. By default, routes are added in the main routing table: # ip route add 19.1.0.0/16 via 192.168.9.1 # # ip route show table main 19.1.0.0/16 via 192.168.9.1 dev ens34 Kernel function inet_rtm_newroute handles the addition of routes. Function rtm_to_fib_config converts netlink data to kern ...

catalogue 1, Introduction to SPI communication protocol 2, SPI communication timing 1. Master slave communication 2. Mode selection 3, Instance summary 1, Introduction to SPI communication protocol      SPI is the abbreviation of serial peripheral interface. It is a synchronous serial interface technology launched ...

Mall infrastructure diagram: Preparation of necessary components docker installation, sql,redis Each image of docker can be regarded as loading an application on a complete and independent Linux system. instructions For more detailed instruction learning, refer to: docker Instruction Learning docker images: view the installed i ...

Early reviewThe previous chapter mainly shared with you the definition of functions in GO language and the simple usage of pointers in GO language. In this chapter, old cat will learn about containers in GO language with you.arrayDefinition of arrayWhen it comes to containers, people with programming experience must first think of arrays. Of co ...