YASH Technologies interview question

1) React to backend flow (How to connect from react to backend)? 2) Write Rest api for delete by id? 3) @Pathvariable and @Requestmapping? 4) OOP'S Concepts. 5) What is static modifier? 6) Sort the employee list based on the employee name using the java8? 7) what is exception? 8) How to create the Global exception in spring boot? 9) how to send the response? 10) what is optional class? *) What is the @Transactional Annotation? 11) What is react ? 12) What is mean by components? 13) what is class component and functional component? 14) what is virtual dom? 15) What is the hooks present in react? 16) What is react-redux?