Zelle. The book "Java 23 Key Concepts in Brief" by John M. Zelle provides a comprehensive overview of the key concepts of Java programming language, covering the fundamental principles and techniques that every programmer should know. The book is designed to be concise and easy to read, making it an ideal resource for both beginners and experienced programmers looking to refresh their understanding of the language. The book begins by introducing the basic concepts of Java, such as variables, data types, operators, control structures, and functions. It then delves into more advanced topics like object-oriented programming, inheritance, polymorphism, and exception handling. Each concept is explained in a clear and concise manner, with examples and exercises to help reinforce the reader's understanding. One of the unique features of this book is its focus on the evolution of technology and how it has impacted society. The author emphasizes the importance of studying and understanding the process of technological development, as it is crucial for the survival of humanity and the unification of people in a warring state. This perspective sets the book apart from other resources on Java programming, which often focus solely on the technical aspects of the language without considering its broader implications.

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