1. Syntax structure: Introduce the basic syntax structure of Java language, including variables, data types, operators, expressions, etc.

2. Control statements: Explain control statements in Java language, including conditional statements, loop statements, exception handling, etc.

3. Arrays and collections: Introduce the classes of arrays and collections in Java language, including ArrayList and LinkedList.

4. String operation: explain the operation methods of strings in Java language, including connection, replacement, segmentation and so on.

5. Functions and classes: Introduce functions and classes in Java language, including constructors, methods, inheritance, encapsulation, etc.

Second, object-oriented programming.

1. encapsulation: This paper introduces the concept of encapsulation in Java language, including the definition of classes and the use of access modifiers.

2. Inheritance: Explain the concept of inheritance in Java language, including the relationship between subclasses and parent classes, rewriting methods, etc.

3. Polymorphism: Introduce the concept of polymorphism in Java language, including abstract classes and interfaces.

4. Exception handling: explain the exception handling mechanism in Java language, including the use of try-catch-finally statement.

5. Design patterns: Introduce common design patterns in Java language, such as singleton pattern and factory patterns.

Third, Java Web development

1.Servlet technology: Introduce the basic concept and working principle of Servlet, and the common Servlet API.

2.JSP technology: Explain the basic syntax and common tags of JSP, and the combination with Servlet.

3.JavaBean technology: Introduce the basic concept and working principle of JavaBean and its application in Web development.

4.MVC pattern: Introduce MVC pattern in Java Web development and its application in Spring framework.

5. Database operation: Explain the common database operation technologies in Java Web development, such as JDBC and Hibernate.

Fourth, spring mvc and development tools.

1.Spring Framework: Introduce the basic concepts and working principles of Spring Framework, as well as the commonly used Spring API.

2.Struts framework: explain the basic usage and common problems of Struts framework, and the integrated use with Spring framework.

3.Eclipse development tools: Introduce the basic usage of Eclipse development tools and commonly used plug-ins, such as MyEclipse.

4.Maven building tools: explain the basic usage and common problems of Maven building tools, as well as their application in Java projects.

5.Git version control tool: Introduce the basic usage and common problems of Git version control tool and its application in teamwork.

Verb (abbreviation for verb) Java performance optimization and security

1. Performance optimization: This paper introduces the common methods and technologies of Java performance optimization, such as caching technology and multithreading technology.

2. Security: Explain the basic concepts and common problems of Java security, such as encryption technology and authority management.

3. Performance testing and tuning: Introduce the basic methods and skills of performance testing and tuning, and its application in Java projects.

4. Code review and quality assurance: Introduce the basic concepts and methods of code review and quality control to improve the quality and stability of Java projects.