Pregunta de entrevista de Wells Fargo

phone screen was basically on app dev. questions on spring annotations @repository, @ service, @controller, @component etc. Maven configuration and build process. Some on java Hashset - what happens if you try to add duplicate does it update or not. onsite interview conducted by 2 people. questions on hashset implementations , sort method impl using comparable. some core java questions like runnable vs callable. write prgm to find the number of pairs of integers in the array whose sum is equal to ‘sum’. sql to write first highest salary.