Problem:
Question 1- What is a functional interface? This pertains to the java programming language. Please give a detailed explanation in a couple paragraphs or use of an example.
Question 2- Explain how default methods enable you to add new methods to an existing interface without breaking the classes that implemented the original interface? This pertains to the java programming language. Give a detailed explanation in a couple paragraphs.
Please be detialed and not something copied and pasted from Google.