Printing odd and even numbers in sequence using 2 threads is a use case of synchronization and inter thread communication.

JSON-Java offers classes like JSONObject and JSONArray that offer various ways to create Json via overloaded constructors. They can be used to read Json as well.

String.join() joins the given string elements with the specified delimiter by concatenating them with the delimiter and returns a new string. A collection of strings can also be joined by this method.