The book "Java. Object-oriented programming" is an indispensable reference for those who want to learn or deepen their knowledge of Java programming. The book covers in detail the main principles of object-oriented programming, such as encapsulation, polymorphism, inheritance, as well as working with classes and objects. The author explains complex concepts of Java in a simple and understandable language, giving examples and exercises for a better understanding of the material. The book contains information about the structure of the Java language, built-in classes and libraries, working with exceptions, reading and writing to a file, working with arrays and collections. "Java. Object-oriented programming" offers not only theoretical material, but also practical tasks, thanks to which you can deepen your skills in Java programming and implement your projects. This book is an excellent guide for beginners and experienced programmers who want to improve their Java skills.