Java is a high-level programming language introduced by SUN (Stanford University Network, Stanford University Network) in 1995. Multi-threaded and dynamic language. With decades of development, Java has been widely accepted and has promoted the rapid development of the Web. Java technology has also been continuously updated and has become the preferred development language for Web applications. This course was recorded by front-line lecturer Teacher Xie. The course is rich and comprehensive and is a rare classic JAVA course.