The tutorial is intended for programmers starting and continuing to learn Java SE 6 and J2EE technologies. Its first part deals with the basics of the Java language and the concepts of object-oriented programming. The second part describes the most important aspects of using Java class libraries, including files, collections, network and multithreaded applications, as well as interaction with XML. The third part provides the basics of programming distributed information systems using servlets, JSP, databases and developer's own tags.