Pregunta de entrevista de LTM Limited

What is Javas first name? What makes java unique and why only java ? What are errors and exceptions in java Can we run without main()? How can you handle an error? How can you run a program without main() and error? How do you print a few lines of code without having to know if expections are handled or not ? What is Data structure and algorithm? What is a b tree and its use cases(real world)?