(Java from Beginner to Proficient (3rd Edition) starts from the perspective of beginners, and introduces the knowledge of using Java language for program development through easy to understand languages and colorful examples. The book is divided into 28 chapters, including initial knowledge of Java, understanding of Eclipse development tools, Java language foundation, process control, strings, arrays, classes and objects, packaging classes, digital management classes, interfaces, inheritance and polymorphism, high-grade features of classes, exception management, Swing programming, integration classes, I/O (input/output), reflection, enumeration types and generics, multithreading, network communication, database operations, Swing table components, Swing tree components, Swing other high-end components, high-end design managers, High level event management, AWT drawing and audio playback, printing technology and enterprise purchase, sales and inventory management system. All the knowledge in the book is introduced with specific examples, and the program code touched is given specific comments, so that readers can easily understand the essence of Java program development and quickly improve the development technology.)