Programmer Think

① Traversal mode and concept of binary tree Preorder traversal: traverse according to the head left right method, first output the head, then output the left, and finally output the right.                 According to the above figure, the preceding traversal should ...

catalogue 1, Introduction to swagge 2, SpringBoot integration Swagger   3, Configure Swagger   4, Configure scan interface 5, Configure Swagger switch 6, Configure API grouping   7, Entity configuration 8, Summary: 1, Introduction to swagge Front and rear end separation:        &nbsp ...

1. Build environment Create a basic Maven project and import the dependencies required by the project <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven. ...

Encryption of user password: during user registration, query whether the user exists in the database according to the transmitted information. If it does not exist, encrypt its password. The encrypted information is stored in the database. When logging in, encrypt the login password again and verify it with the encrypted information in the data ...

1. Factory Method What is the factory method? Get Object by Method Call Scenarios: 1) Users cannot create objects directly. Creating objects that are too complex can be effortless in a factory (mobile phone) (singleton)  2) Users do not want to participate in object creation   Comparison of abstract classes and interfaces 2. ...