Given a list of streams, sort the streams based on the length of the character word in ascending order and get only the first three.

What is an interface, why was it introduced, and what are its concerns? Can we override the default method of an interface, and why?

What are useState and props in ReactJS?

Can we pass data from props also?

What is Dependency Injection?

What is scope?

What is a singleton? Why is it used (e.g., in threads)? Are there other ways to implement a singleton, or what are those other ways?

What are HashMap and ConcurrentHashMap? Explain Copy-on-write, how everything exists for them, and how to implement them.

What is the difference between String, StringBuffer, and StringBuilder? When and why would you choose one over the others?

Implement a custom comparator for sorting employees based on alphabetical order of their names. (Increase speed)