The tutorial is intended for students of object-oriented programming at the university, as well as for anyone who wants to learn the Java programming language on their own. The book covers all the basic topics necessary for effective programming in Java, including basic data types, control instructions, features of describing classes and objects in Java, creating packages and interfaces, overloading methods and inheritance. Special attention is paid to the creation of applications with a graphical interface. The first part of the book outlines the basics of Java syntax. The material of the first part of the book is enough to write simple programs . The second part describes topics that will be interesting for those who want to master the language at a professional level. Each chapter of the book contains theoretical material illustrated by simple examples to emphasize the features of the Java programming language. At the end of each chapter of the first part there is a section with examples of problem solving. The textbook complies with the State educational standard of the 3rd generation for the specialties "Computer Science and Computer Engineering", "Information Systems and Technologies", "Applied Informatics" and "Fundamental Informatics and Information Technologies" .