Programmer Think

The following are my notes on watching the Java learning video of shangsilicon valley Use of File class java.io.File class: the abstract representation of file and file directory path, which is platform independentFile can create, delete and rename files and directories, but file cannot access the file content itself. If you need to access ...

Integrated persistence layer framework Mybatis Integrated Mybatis Introduce dependency <!-- integrate mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.3</version&gt ...

First knowledge of distributed lock (II): analysis of ZooKeeper distributed lock principle and practical cases It's not easy to write. Praise and collect attention so that you can see it next time. Thank you for your support ~ Last time we talked about using Mysql database to realize distributed locking. It is relatively simple to implem ...

C language minesweeping The code implementation of mine sweeping is similar to that of Sanzi chess. The main difference lies in the implementation of game code Divided into three files to write test c ,game.h ,game.c test.c: Used to implement the overall framework and test code game.h: Used for symbol definition, function declaration an ...

C + + learning notes quote 📖 1. Definition of reference int a = 3; int &r = a; // In this case, it is called r reference a, and r is the alias of A Note: after initializing the reference, it cannot be modified int b = 4; r = b; //At this time, it is only equivalent to assigning the value of b to a; 2. Function of reference ...

1, On constructor 1.1 constructor body assignment When creating an object, the compiler calls the constructor to give each member variable in the object an appropriate initial value class Date { public: Date(int year, int month, int day) { _year = year; _month = month; _day = day; } private: int _year; int _month; ...

1. Classes and objects 1.1 what is the object? Everything is an object, and everything that exists objectively is an object 1.2 what is object-oriented? The action of paying attention to objects is called object-oriented For example, I'm going to the supermarket to buy fruit. Fruit is an object. I pay attention to its type, size, acidity a ...

Knowledge points object-oriented Topic 1 (training) Define the mobile phone class. The mobile phone has three attributes: brand, price and color. It has two functions: call() and sendMessage(). Please define the mobile phone class. There should be empty parameters, parameter construction methods and set/get methods in the class. Define the ...

1, Foreword Finally, when it's time to get the second shot of vaccine, I have no choice but to open the "Guangzhou Health Link" or "Guangdong Health Link" applet every time. Every time, I am booked. Guangzhou has a large population. Maybe many people have been waiting for the number in front of the applet, so this article w ...

https://www.bilibili.com/video/BV1et411b73Z?p=135https://www.bilibili.com/video/BV1et411b73Z?p=135 Polymorphism is one of the three characteristics of C + + object-oriented Polymorphisms fall into two categories: Static polymorphism: function overloading and operator overloading belong to static polymorphism and reuse function names Dynamic ...