(1) JavaSE
- Java Standard Edition (a set of class libraries: a set of class libraries written by others, but this class library is a standard class library, use EE, Or take ME, this SE must be the foundation, learn it first.)
(2) JavaEE (WEB direction, WEB system.)
- Java Enterprise Edition (also A set of class libraries: It is also a set of class libraries written by others, but this set of class libraries can help us complete the development of enterprise-level projects, and is a set (multiple sets) of class libraries specifically designed to provide solutions within the enterprise.) < /span> - Set-top box kernel program, vacuum cleaner kernel program, refrigerator kernel program, rice cooker kernel program. . . . . - Java Micro Edition (still a set of class libraries, but this class library helps us develop core programs for electronic micro devices) (3) JavaME - The most popular aspect of Java is this JavaEE direction. - Can develop web systems.
- You can use it if it is written by others. You can use it to develop enterprise-level projects.
- JavaEE actually includes many specifications, 13 specifications, among which Servlet is one of the JavaEE specifications. Learn Servlet or Java language.