Pregunta de entrevista de Solitera Software

OOPS concepts , Collection Interface, SQL Query, mainly focuses on checking the theory concept. in my interview the questions asked to me is : 1. What is String 2. Is using string as a password is safe 3. What is Interface 4. what is classes and interface 5. what is abstraction 6. how java handle string garbage collection 7. why we use arraylist 8. all types of collection framework 9. exception handling 10. types of exceptions 11. what is spring 12. arc. of spring 13. what is JPA 14. Mapping 15. SQL query to fetch the max salary of the employee from the table 16. WAP to check the given number is even or odd without using any kind of statement 17. how we connect the database 18. about HTTP requests