(Java syntax format, keyword, identifier, comment, data type, constant and variable, variable effect field, data type conversion, operator, expression. Program process control sentences and their usage scenarios, overloading of functions and functions, arrays and common operations. Goal oriented thinking, overview of classes, essence of goals, relationship between classes and goals, and how to use goal oriented thinking to solve problems in actual development. How to design classes, the basic principles of designing classes, and the use of goals. Java integrates three elements of system structure, exception, IO concept, multithreading concept, Java graphical user interface programming (AWT, Swing), Java network programming, network communication model, and network communication, as well as its corresponding Java implementation. High end features of Java: classloader. Learning is the best investment. For more free videos, please log in to Tuoyue Teaching txjava to download for free)