"Codebook Java" is an Android application that is designed for students and professionals who want to improve their coding skills in Java programming language. The app offers a comprehensive collection of more than 200 source code examples, academic questions, and interview questions.

With "Codebook Java", users can learn Java programming concepts and apply them to real-world scenarios. The source code examples cover a wide range of topics, including data structures, algorithms, object-oriented programming, and more. Each example is accompanied by a detailed explanation that helps users understand the code and the concepts behind it.

The app also includes a collection of academic questions that cover important Java programming topics, such as loops, arrays, and methods. These questions can be used by students to test their knowledge and prepare for exams.

In addition to the academic questions, "Codebook Java" also provides users with a collection of interview questions. These questions are designed to help job seekers prepare for Java programming interviews. The questions cover a range of topics, including Java basics, collections, and multithreading.

"Codebook Java" also features a collection of academic projects that users can use to practice their Java programming skills. These projects are designed to challenge users and help them develop their problem-solving abilities.

And now, the app also includes ChatGPT, a large language model trained by OpenAI. Users can chat with ChatGPT to get answers to their programming questions or to get help with their coding projects. ChatGPT can understand natural language and provide accurate and helpful responses.

Overall, "Codebook Java" is an excellent app for anyone who wants to improve their Java programming skills. It provides a comprehensive collection of resources that can be used by students and professionals alike to learn, practice, and improve their coding abilities.