• A-A: Java 基础

• A-B: Java 模块化

• A-C: Java 库

• A-D: Java 库

• A-E: Java 新特性

• B-A MySQL 基础

• B-B JDBC + XML

• C-A: 前端开发基础

• C-B: 前端开发高级

• D-A: Java Web

• D-B: Java Web

• D-C: Linux 操作基础

• Warehouse created and updated

• Unit A-A ended, some notes are missing

• Added JDBC content and improved some SQL content

• Complete SQL query description and XML document description

• Completed MySQL small project

This is a free Java note. It is prohibited to make profits commercially or in any way! The ownership belongs to the author! And enjoy and reserve the right to investigate responsibility!