UBS Core Java Developer interview questions

1. Tell me something about you? 2. Tell some your skills ? 3. Explain internal working of Treemap? 4. following above question , What is self balanced tree ,& Binery tree? explain how it is work and how it is used in TreeMap. 5.Why we need Callable interface? tell something about Future? 6. where do you used the multithreading in your project? why do you used it? 2nd round(Manager) 1. we have map ,and we have put these values , how many element would be there in map? 2.How you can access service from component?(angular2+) 3. how you can call any api from service?(angular2+) 4. what is payload? 5. Full form of JSON and Rest? 6. give some example of JSON? 7. IS it important to put all key and value inside "" this mark?(JSON) 8. Do you remeber any jar that convert the given object into Json? 9.how you can retrieve back the key of given value from map if you forget the key? 10. what collection will you use to cache all the data of Employee table? 11. how you will create REST API in Spring rest/Spring boot? 12. what happen if two different developer use the same END point url while creating the REST api? 13. sql - suppose you have employee table , any you have to find out how many male and female are working. than write sql to find it. 14. sql. now find out male and female count based on city that working on company?